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From GitBox <...@apache.org>
Subject [GitHub] DaanHoogland closed pull request #2309: CLOUDSTACK-10132: Multiple Management Servers Support for agents
Date Thu, 01 Jan 1970 00:00:00 GMT
DaanHoogland closed pull request #2309: CLOUDSTACK-10132: Multiple Management Servers Support for agents
URL: https://github.com/apache/cloudstack/pull/2309
 
 
   

This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:

As this is a foreign pull request (from a fork), the diff is supplied
below (as it won't show otherwise due to GitHub magic):

diff --git a/agent/conf/agent.properties b/agent/conf/agent.properties
index 0354aceadab..c01bef6703d 100644
--- a/agent/conf/agent.properties
+++ b/agent/conf/agent.properties
@@ -30,6 +30,14 @@ workers=5
 #host= The IP address of management server
 host=localhost
 
+# The time interval in seconds after which agent will check if connected host
+# is the preferred host (the first host in the comma-separated list is preferred
+# one) and will attempt to reconnect to the preferred host when it's connected
+# to one of the secondary/backup hosts.
+# The timer task is scheduled when agent starts for the first time, any change
+# in this setting requires restarting the agent.
+host.lb.interval=0
+
 #port = The port management server listening on, default is 8250
 port=8250
 
diff --git a/agent/src/main/java/com/cloud/agent/Agent.java b/agent/src/main/java/com/cloud/agent/Agent.java
index d2669c03aeb..44ae0ee4457 100644
--- a/agent/src/main/java/com/cloud/agent/Agent.java
+++ b/agent/src/main/java/com/cloud/agent/Agent.java
@@ -21,6 +21,8 @@
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.Socket;
 import java.net.UnknownHostException;
 import java.nio.channels.ClosedChannelException;
 import java.nio.charset.Charset;
@@ -38,12 +40,15 @@
 import javax.naming.ConfigurationException;
 
 import org.apache.cloudstack.agent.directdownload.SetupDirectDownloadCertificate;
+import org.apache.cloudstack.agent.mslb.SetupManagementServersListAnswer;
+import org.apache.cloudstack.agent.mslb.SetupManagementServersListCommand;
 import org.apache.cloudstack.ca.SetupCertificateAnswer;
 import org.apache.cloudstack.ca.SetupCertificateCommand;
 import org.apache.cloudstack.ca.SetupKeyStoreCommand;
 import org.apache.cloudstack.ca.SetupKeystoreAnswer;
 import org.apache.cloudstack.managed.context.ManagedContextTimerTask;
 import org.apache.cloudstack.utils.security.KeyStoreUtils;
+import org.apache.commons.collections.CollectionUtils;
 import org.apache.commons.io.FileUtils;
 import org.apache.log4j.Logger;
 import org.slf4j.MDC;
@@ -65,6 +70,7 @@
 import com.cloud.exception.AgentControlChannelException;
 import com.cloud.resource.ServerResource;
 import com.cloud.utils.PropertiesUtil;
+import com.cloud.utils.StringUtils;
 import com.cloud.utils.backoff.BackoffAlgorithm;
 import com.cloud.utils.concurrency.NamedThreadFactory;
 import com.cloud.utils.exception.CloudRuntimeException;
@@ -121,6 +127,7 @@ public int value() {
     Long _id;
 
     Timer _timer = new Timer("Agent Timer");
+    Timer hostLBTimer = new Timer("Host LB Timer");
 
     List<WatchTask> _watchList = new ArrayList<WatchTask>();
     long _sequence = 0;
@@ -144,7 +151,7 @@ public Agent(final IAgentShell shell) {
         _shell = shell;
         _link = null;
 
-        _connection = new NioClient("Agent", _shell.getHost(), _shell.getPort(), _shell.getWorkers(), this);
+        _connection = new NioClient("Agent", _shell.getNextHost(), _shell.getPort(), _shell.getWorkers(), this);
 
         Runtime.getRuntime().addShutdownHook(new ShutdownThread(this));
 
@@ -179,7 +186,7 @@ public Agent(final IAgentShell shell, final int localAgentId, final ServerResour
             throw new ConfigurationException("Unable to configure " + _resource.getName());
         }
 
-        final String host = _shell.getHost();
+        final String host = _shell.getNextHost();
         _connection = new NioClient("Agent", host, _shell.getPort(), _shell.getWorkers(), this);
 
         // ((NioClient)_connection).setBindAddress(_shell.getPrivateIp());
@@ -255,7 +262,7 @@ public void start() {
             s_logger.info("Attempted to connect to the server, but received an unexpected exception, trying again...");
         }
         while (!_connection.isStartup()) {
-            final String host = _shell.getHost();
+            final String host = _shell.getNextHost();
             _shell.getBackoffAlgorithm().waitBeforeRetry();
             _connection = new NioClient("Agent", host, _shell.getPort(), _shell.getWorkers(), this);
             s_logger.info("Connecting to host:" + host);
@@ -266,6 +273,8 @@ public void start() {
                 s_logger.info("Attempted to connect to the server, but received an unexpected exception, trying again...");
             }
         }
+        _shell.updateConnectedHost();
+        scheduleHostLBCheckerTask();
     }
 
     public void stop(final String reason, final String detail) {
@@ -310,6 +319,14 @@ public void setId(final Long id) {
         _shell.setPersistentProperty(getResourceName(), "id", Long.toString(id));
     }
 
+    private synchronized void scheduleHostLBCheckerTask() {
+        final long checkInterval = _shell.getHostLBTimerInterval();
+        if (checkInterval > 0L) {
+            s_logger.info("Scheduling preferred host timer task with host.lb.interval=" + checkInterval + "ms");
+            hostLBTimer.scheduleAtFixedRate(new PreferredHostCheckerTask(), checkInterval, checkInterval);
+        }
+    }
+
     public void scheduleWatch(final Link link, final Request request, final long delay, final long period) {
         synchronized (_watchList) {
             if (s_logger.isDebugEnabled()) {
@@ -332,8 +349,7 @@ protected void cancelTasks() {
             _watchList.clear();
         }
     }
-    public synchronized void lockStartupTask(final Link link)
-    {
+    public synchronized void lockStartupTask(final Link link) {
         _startup = new StartupTask(link);
         _timer.schedule(_startup, _startupWait);
     }
@@ -402,19 +418,23 @@ protected void reconnect(final Link link) {
             }
         }
 
-        link.close();
-        link.terminated();
+        if (link != null) {
+            link.close();
+            link.terminated();
+        }
 
         setLink(null);
         cancelTasks();
 
         _resource.disconnected();
 
+        final String lastConnectedHost = _shell.getConnectedHost();
+
         int inProgress = 0;
         do {
             _shell.getBackoffAlgorithm().waitBeforeRetry();
 
-            s_logger.info("Lost connection to the server. Dealing with the remaining commands...");
+            s_logger.info("Lost connection to host: " + lastConnectedHost + ". Dealing with the remaining commands...");
 
             inProgress = _inProgress.get();
             if (inProgress > 0) {
@@ -434,10 +454,10 @@ protected void reconnect(final Link link) {
             _shell.getBackoffAlgorithm().waitBeforeRetry();
         }
 
-        final String host = _shell.getHost();
         do {
+            String host = _shell.getNextHost();
             _connection = new NioClient("Agent", host, _shell.getPort(), _shell.getWorkers(), this);
-            s_logger.info("Reconnecting to host:" + host);
+            s_logger.info("Lost connection to host: " + lastConnectedHost + ". Connecting to next host: " + host);
             try {
                 _connection.start();
             } catch (final NioConnectionException e) {
@@ -452,7 +472,8 @@ protected void reconnect(final Link link) {
             }
             _shell.getBackoffAlgorithm().waitBeforeRetry();
         } while (!_connection.isStartup());
-        s_logger.info("Connected to the server");
+        _shell.updateConnectedHost();
+        s_logger.info("Connected to the host: " + _shell.getConnectedHost());
     }
 
     public void processStartupAnswer(final Answer answer, final Response response, final Link link) {
@@ -554,6 +575,8 @@ protected void processRequest(final Request request, final Link link) {
                         answer = setupAgentCertificate((SetupCertificateCommand) cmd);
                     } else if (cmd instanceof SetupDirectDownloadCertificate) {
                         answer = setupDirectDownloadCertificate((SetupDirectDownloadCertificate) cmd);
+                    } else if (cmd instanceof SetupManagementServersListCommand) {
+                        answer = setupManagementServersList((SetupManagementServersListCommand) cmd);
                     } else {
                         if (cmd instanceof ReadyCommand) {
                             processReadyCommand(cmd);
@@ -628,6 +651,41 @@ private Answer setupDirectDownloadCertificate(SetupDirectDownloadCertificate cmd
         return new Answer(cmd, true, "Certificate " + certificateName + " imported");
     }
 
+    /**
+     * Persist newly received management servers list
+     * @param msList management servers list
+     */
+    private void persistNewManagementServersList(List<String> msList) {
+        final String newHosts = StringUtils.toCSVList(msList);
+        _shell.setHosts(newHosts);
+        _shell.setPersistentProperty(null, "host", newHosts);
+        s_logger.info("Saved new management servers list: " + msList);
+    }
+
+    /**
+     * Persist mgmt hosts list if it is not empty
+     * @param msList management hosts list
+     */
+    private void setupMgmtHostsList(List<String> msList) {
+        if (CollectionUtils.isNotEmpty(msList)) {
+            try {
+                persistNewManagementServersList(msList);
+                _shell.resetHostCounter();
+            } catch (Exception e) {
+                throw new CloudRuntimeException("Couldnt persist received management servers list", e);
+            }
+        }
+    }
+
+    /**
+     * Process SetupManagementServersListCommand
+     */
+    private Answer setupManagementServersList(SetupManagementServersListCommand cmd) {
+        final List<String> msList = cmd.getMsList();
+        setupMgmtHostsList(msList);
+        return new SetupManagementServersListAnswer(true);
+    }
+
     public Answer setupAgentKeystore(final SetupKeyStoreCommand cmd) {
         final String keyStorePassword = cmd.getKeystorePassword();
         final long validityDays = cmd.getValidityDays();
@@ -728,15 +786,15 @@ public void processResponse(final Response response, final Link link) {
     }
 
     public void processReadyCommand(final Command cmd) {
-
         final ReadyCommand ready = (ReadyCommand)cmd;
 
-        s_logger.info("Proccess agent ready command, agent id = " + ready.getHostId());
+        s_logger.info("Processing agent ready command, agent id = " + ready.getHostId());
         if (ready.getHostId() != null) {
             setId(ready.getHostId());
         }
-        s_logger.info("Ready command is processed: agent id = " + getId());
+        setupMgmtHostsList(ready.getMgmtHosts());
 
+        s_logger.info("Ready command is processed for agent id = " + getId());
     }
 
     public void processOtherTask(final Task task) {
@@ -1018,4 +1076,41 @@ public void doTask(final Task task) throws TaskExecutionException {
             }
         }
     }
+
+    public class PreferredHostCheckerTask extends ManagedContextTimerTask {
+
+         @Override
+         protected void runInContext() {
+             try {
+                 int index = 0;
+                 final String[] msList = _shell.getHosts();
+                 String preferredHost  = msList[index];
+                 final String connectedHost = _shell.getConnectedHost();
+                 if (s_logger.isTraceEnabled()) {
+                     s_logger.trace("Running preferred host checker task, connected host=" + connectedHost + ", preferred host=" + preferredHost);
+                 }
+                 if (!preferredHost.equals(connectedHost) && _link != null) {
+                     boolean isHostUp = true;
+                     try (final Socket socket = new Socket()) {
+                         socket.connect(new InetSocketAddress(preferredHost, _shell.getPort()), 5000);
+                     } catch (final IOException e) {
+                         isHostUp = false;
+                         if (s_logger.isDebugEnabled()) {
+                             s_logger.debug("Host: " + preferredHost + " is not reachable");
+                         }
+                     }
+                     if (isHostUp && _link != null && _inProgress.get() == 0) {
+                         if (s_logger.isDebugEnabled()) {
+                             s_logger.debug("Preferred host " + preferredHost + " is found to be reachable, trying to reconnect");
+                         }
+                         _shell.resetHostCounter();
+                         reconnect(_link);
+                     }
+                 }
+             } catch (Throwable t) {
+                 s_logger.error("Error caught while attempting to connect to preferred host", t);
+             }
+         }
+
+    }
 }
diff --git a/agent/src/main/java/com/cloud/agent/AgentShell.java b/agent/src/main/java/com/cloud/agent/AgentShell.java
index 5950bc78e61..734ae33c129 100644
--- a/agent/src/main/java/com/cloud/agent/AgentShell.java
+++ b/agent/src/main/java/com/cloud/agent/AgentShell.java
@@ -50,6 +50,7 @@
 import com.cloud.utils.backoff.BackoffAlgorithm;
 import com.cloud.utils.backoff.impl.ConstantTimeBackoff;
 import com.cloud.utils.exception.CloudRuntimeException;
+import com.google.common.base.Strings;
 
 public class AgentShell implements IAgentShell, Daemon {
     private static final Logger s_logger = Logger.getLogger(AgentShell.class.getName());
@@ -72,6 +73,9 @@
     private volatile boolean _exit = false;
     private int _pingRetries;
     private final List<Agent> _agents = new ArrayList<Agent>();
+    private String hostToConnect;
+    private String connectedHost;
+    private long hostLBTimerInterval;
 
     public AgentShell() {
     }
@@ -107,18 +111,47 @@ public String getPod() {
     }
 
     @Override
-    public String getHost() {
-        final String[] hosts = _host.split(",");
+    public String getNextHost() {
+        final String[] hosts = getHosts();
         if (_hostCounter >= hosts.length) {
             _hostCounter = 0;
         }
-        final String host = hosts[_hostCounter % hosts.length];
+        hostToConnect = hosts[_hostCounter % hosts.length];
         _hostCounter++;
-        return host;
+        return hostToConnect;
     }
 
-    public void setHost(final String host) {
-        _host = host;
+    @Override
+    public String getConnectedHost() {
+        return connectedHost;
+    }
+
+    @Override
+    public long getHostLBTimerInterval() {
+        return hostLBTimerInterval * 1000L;
+    }
+
+    @Override
+    public void updateConnectedHost() {
+        connectedHost = hostToConnect;
+    }
+
+    @Override
+    public void setHosts(final String host) {
+        if (Strings.isNullOrEmpty(_host) || !_host.equals(host)) {
+            _host = host;
+            resetHostCounter();
+        }
+    }
+
+    @Override
+    public void resetHostCounter() {
+        _hostCounter = 0;
+    }
+
+    @Override
+    public String[] getHosts() {
+        return _host.split(",");
     }
 
     @Override
@@ -291,6 +324,9 @@ protected boolean parseCommand(final String[] args) throws ConfigurationExceptio
             _properties.setProperty("guid", _guid);
         }
 
+        String val = getProperty(null, "host.lb.interval");
+        hostLBTimerInterval = (Strings.isNullOrEmpty(val) ? 0L : Long.valueOf(val));
+
         return true;
     }
 
diff --git a/agent/src/main/java/com/cloud/agent/IAgentShell.java b/agent/src/main/java/com/cloud/agent/IAgentShell.java
index dde67381a4a..b0edd52e7eb 100644
--- a/agent/src/main/java/com/cloud/agent/IAgentShell.java
+++ b/agent/src/main/java/com/cloud/agent/IAgentShell.java
@@ -22,33 +22,45 @@
 import com.cloud.utils.backoff.BackoffAlgorithm;
 
 public interface IAgentShell {
-    public Map<String, Object> getCmdLineProperties();
+    Map<String, Object> getCmdLineProperties();
 
-    public Properties getProperties();
+    Properties getProperties();
 
-    public String getPersistentProperty(String prefix, String name);
+    String getPersistentProperty(String prefix, String name);
 
-    public void setPersistentProperty(String prefix, String name, String value);
+    void setPersistentProperty(String prefix, String name, String value);
 
-    public String getHost();
+    String getNextHost();
 
-    public String getPrivateIp();
+    String getPrivateIp();
 
-    public int getPort();
+    int getPort();
 
-    public int getWorkers();
+    int getWorkers();
 
-    public int getProxyPort();
+    int getProxyPort();
 
-    public String getGuid();
+    String getGuid();
 
-    public String getZone();
+    String getZone();
 
-    public String getPod();
+    String getPod();
 
-    public BackoffAlgorithm getBackoffAlgorithm();
+    BackoffAlgorithm getBackoffAlgorithm();
 
-    public int getPingRetries();
+    int getPingRetries();
 
-    public String getVersion();
+    String getVersion();
+
+    void setHosts(String hosts);
+
+    void resetHostCounter();
+
+    String[] getHosts();
+
+    long getHostLBTimerInterval();
+
+    void updateConnectedHost();
+
+    String getConnectedHost();
 }
diff --git a/agent/src/test/java/com/cloud/agent/AgentShellTest.java b/agent/src/test/java/com/cloud/agent/AgentShellTest.java
index 8ceba4531d1..868293c8977 100644
--- a/agent/src/test/java/com/cloud/agent/AgentShellTest.java
+++ b/agent/src/test/java/com/cloud/agent/AgentShellTest.java
@@ -35,7 +35,7 @@ public void parseCommand() throws ConfigurationException {
         shell.parseCommand(new String[] {"port=55555", "threads=4", "host=localhost", "pod=pod1", "guid=" + anyUuid, "zone=zone1"});
         Assert.assertEquals(55555, shell.getPort());
         Assert.assertEquals(4, shell.getWorkers());
-        Assert.assertEquals("localhost", shell.getHost());
+        Assert.assertEquals("localhost", shell.getNextHost());
         Assert.assertEquals(anyUuid.toString(), shell.getGuid());
         Assert.assertEquals("pod1", shell.getPod());
         Assert.assertEquals("zone1", shell.getZone());
@@ -53,10 +53,10 @@ public void loadProperties() throws ConfigurationException {
     public void testGetHost() {
         AgentShell shell = new AgentShell();
         List<String> hosts = Arrays.asList("10.1.1.1", "20.2.2.2", "30.3.3.3", "2001:db8::1");
-        shell.setHost(StringUtils.listToCsvTags(hosts));
+        shell.setHosts(StringUtils.listToCsvTags(hosts));
         for (String host : hosts) {
-            Assert.assertEquals(host, shell.getHost());
+            Assert.assertEquals(host, shell.getNextHost());
         }
-        Assert.assertEquals(shell.getHost(), hosts.get(0));
+        Assert.assertEquals(shell.getNextHost(), hosts.get(0));
     }
 }
diff --git a/api/src/main/java/org/apache/cloudstack/config/ApiServiceConfiguration.java b/api/src/main/java/org/apache/cloudstack/config/ApiServiceConfiguration.java
index 485688a3769..33a08d7933f 100644
--- a/api/src/main/java/org/apache/cloudstack/config/ApiServiceConfiguration.java
+++ b/api/src/main/java/org/apache/cloudstack/config/ApiServiceConfiguration.java
@@ -20,7 +20,7 @@
 import org.apache.cloudstack.framework.config.Configurable;
 
 public class ApiServiceConfiguration implements Configurable {
-    public static final ConfigKey<String> ManagementHostIPAdr = new ConfigKey<String>("Advanced", String.class, "host", "localhost", "The ip address of management server", true);
+    public static final ConfigKey<String> ManagementServerAddresses = new ConfigKey<String>("Advanced", String.class, "host", "localhost", "The ip address of management server", true);
     public static final ConfigKey<String> ApiServletPath = new ConfigKey<String>("Advanced", String.class, "endpointe.url", "http://localhost:8080/client/api",
             "API end point. Can be used by CS components/services deployed remotely, for sending CS API requests", true);
     public static final ConfigKey<Long> DefaultUIPageSize = new ConfigKey<Long>("Advanced", Long.class, "default.ui.page.size", "20",
@@ -36,7 +36,7 @@ public String getConfigComponentName() {
 
     @Override
     public ConfigKey<?>[] getConfigKeys() {
-        return new ConfigKey<?>[] {ManagementHostIPAdr, ApiServletPath, DefaultUIPageSize, ApiSourceCidrChecksEnabled, ApiAllowedSourceCidrList};
+        return new ConfigKey<?>[] {ManagementServerAddresses, ApiServletPath, DefaultUIPageSize, ApiSourceCidrChecksEnabled, ApiAllowedSourceCidrList};
     }
 
 }
diff --git a/core/src/main/java/com/cloud/agent/api/ReadyCommand.java b/core/src/main/java/com/cloud/agent/api/ReadyCommand.java
index b02b004d6e5..05c282ab0be 100644
--- a/core/src/main/java/com/cloud/agent/api/ReadyCommand.java
+++ b/core/src/main/java/com/cloud/agent/api/ReadyCommand.java
@@ -19,6 +19,8 @@
 
 package com.cloud.agent.api;
 
+import java.util.List;
+
 public class ReadyCommand extends Command {
     private String _details;
 
@@ -28,13 +30,14 @@ public ReadyCommand() {
 
     private Long dcId;
     private Long hostId;
+    private List<String> mgmtHosts;
 
     public ReadyCommand(Long dcId) {
         super();
         this.dcId = dcId;
     }
 
-    public ReadyCommand(Long dcId, Long hostId) {
+    public ReadyCommand(final Long dcId, final Long hostId) {
         this(dcId);
         this.hostId = hostId;
     }
@@ -59,4 +62,13 @@ public boolean executeInSequence() {
     public Long getHostId() {
         return hostId;
     }
+
+    public List<String> getMgmtHosts() {
+        return mgmtHosts;
+    }
+
+    public void setMgmtHosts(List<String> mgmtHosts) {
+        this.mgmtHosts = mgmtHosts;
+    }
+
 }
diff --git a/core/src/main/java/com/cloud/agent/api/StartupMgmtHostsCommand.java b/core/src/main/java/com/cloud/agent/api/StartupMgmtHostsCommand.java
new file mode 100644
index 00000000000..efe6603bc8d
--- /dev/null
+++ b/core/src/main/java/com/cloud/agent/api/StartupMgmtHostsCommand.java
@@ -0,0 +1,36 @@
+//
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+//
+
+package com.cloud.agent.api;
+
+import com.cloud.host.Host;
+
+public class StartupMgmtHostsCommand extends StartupCommand {
+
+    private String hosts;
+
+    public StartupMgmtHostsCommand(String hosts) {
+        super(Host.Type.Routing);
+        this.hosts = hosts;
+    }
+
+    public String getHosts() {
+        return hosts;
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/java/org/apache/cloudstack/agent/mslb/SetupManagementServersListAnswer.java b/core/src/main/java/org/apache/cloudstack/agent/mslb/SetupManagementServersListAnswer.java
new file mode 100644
index 00000000000..45a1e27b7f1
--- /dev/null
+++ b/core/src/main/java/org/apache/cloudstack/agent/mslb/SetupManagementServersListAnswer.java
@@ -0,0 +1,30 @@
+//
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+//
+
+package org.apache.cloudstack.agent.mslb;
+
+import com.cloud.agent.api.Answer;
+
+public class SetupManagementServersListAnswer extends Answer {
+
+    public SetupManagementServersListAnswer(final boolean result) {
+        super(null);
+        this.result = result;
+    }
+}
diff --git a/core/src/main/java/org/apache/cloudstack/agent/mslb/SetupManagementServersListCommand.java b/core/src/main/java/org/apache/cloudstack/agent/mslb/SetupManagementServersListCommand.java
new file mode 100644
index 00000000000..847b6a5abdf
--- /dev/null
+++ b/core/src/main/java/org/apache/cloudstack/agent/mslb/SetupManagementServersListCommand.java
@@ -0,0 +1,42 @@
+//
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+//
+
+package org.apache.cloudstack.agent.mslb;
+
+import com.cloud.agent.api.Command;
+import java.util.List;
+
+public class SetupManagementServersListCommand extends Command {
+
+    private List<String> msList;
+
+    public SetupManagementServersListCommand(final List<String> msList) {
+        super();
+        this.msList = msList;
+    }
+
+    public List<String> getMsList() {
+        return msList;
+    }
+
+    @Override
+    public boolean executeInSequence() {
+        return false;
+    }
+}
diff --git a/engine/orchestration/pom.xml b/engine/orchestration/pom.xml
index 80adccbe30d..353366c73b4 100755
--- a/engine/orchestration/pom.xml
+++ b/engine/orchestration/pom.xml
@@ -58,6 +58,11 @@
       <artifactId>cloud-utils</artifactId>
       <version>${project.version}</version>
     </dependency>
+    <dependency>
+      <groupId>org.apache.cloudstack</groupId>
+      <artifactId>cloud-framework-agent-mslb</artifactId>
+      <version>${project.version}</version>
+    </dependency>
     <dependency>
       <groupId>org.apache.cloudstack</groupId>
       <artifactId>cloud-server</artifactId>
diff --git a/engine/orchestration/src/main/java/com/cloud/agent/manager/AgentManagerImpl.java b/engine/orchestration/src/main/java/com/cloud/agent/manager/AgentManagerImpl.java
index b7357756c4c..d22c200d838 100644
--- a/engine/orchestration/src/main/java/com/cloud/agent/manager/AgentManagerImpl.java
+++ b/engine/orchestration/src/main/java/com/cloud/agent/manager/AgentManagerImpl.java
@@ -24,6 +24,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Arrays;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.LinkedBlockingQueue;
@@ -37,6 +38,8 @@
 import javax.inject.Inject;
 import javax.naming.ConfigurationException;
 
+import com.cloud.utils.StringUtils;
+import org.apache.cloudstack.agent.mslb.AgentMSLB;
 import org.apache.cloudstack.ca.CAManager;
 import com.cloud.configuration.ManagementServiceConfiguration;
 import org.apache.cloudstack.framework.config.ConfigKey;
@@ -67,6 +70,7 @@
 import com.cloud.agent.api.ShutdownCommand;
 import com.cloud.agent.api.StartupAnswer;
 import com.cloud.agent.api.StartupCommand;
+import com.cloud.agent.api.StartupMgmtHostsCommand;
 import com.cloud.agent.api.StartupProxyCommand;
 import com.cloud.agent.api.StartupRoutingCommand;
 import com.cloud.agent.api.StartupSecondaryStorageCommand;
@@ -184,6 +188,9 @@
     @Inject
     ManagementServiceConfiguration mgmtServiceConf;
 
+    @Inject
+    AgentMSLB agentMSLB;
+
     protected final ConfigKey<Integer> Workers = new ConfigKey<Integer>("Advanced", Integer.class, "workers", "5",
                     "Number of worker threads handling remote agent connections.", false);
     protected final ConfigKey<Integer> Port = new ConfigKey<Integer>("Advanced", Integer.class, "port", "8250", "Port to listen on for remote agent connections.", false);
@@ -1081,9 +1088,20 @@ private AgentAttache handleConnectedAgent(final Link link, final StartupCommand[
         AgentAttache attache = null;
         ReadyCommand ready = null;
         try {
+            String mgmtHostsFromAgent = getMgmtHostsFromAgent(request.getCommands());
+            List<String> mgmtHostsList = null;
+            if (StringUtils.isNotBlank(mgmtHostsFromAgent)) {
+                mgmtHostsList = Arrays.asList(mgmtHostsFromAgent.split(","));
+            }
             final HostVO host = _resourceMgr.createHostVOForConnectedAgent(startup);
             if (host != null) {
                 ready = new ReadyCommand(host.getDataCenterId(), host.getId());
+
+                if (mgmtHostsList != null && !agentMSLB.isManagementServerListUpToDate(host.getId(), host.getDataCenterId(), mgmtHostsList)) {
+                    //Send the latest mgmt hosts list if it is not up to date on agent side
+                    ready.setMgmtHosts(agentMSLB.getManagementServerList(host.getId(), host.getDataCenterId()));
+                }
+
                 attache = createAttacheForConnect(host, link);
                 attache = notifyMonitorsOfConnection(attache, startup, false);
             }
@@ -1199,6 +1217,18 @@ protected void connectAgent(final Link link, final Command[] cmds, final Request
         _connectExecutor.execute(new HandleAgentConnectTask(link, cmds, request));
     }
 
+    /**
+     * Get mgmt hosts from agent (if any StartupMgmtHostsCommand on cmds), null if no host received
+     */
+    private String getMgmtHostsFromAgent(Command[] cmds) {
+        for (Command cmd : cmds) {
+            if (cmd instanceof StartupMgmtHostsCommand) {
+                return ((StartupMgmtHostsCommand) cmd).getHosts();
+            }
+        }
+        return null;
+    }
+
     public class AgentHandler extends Task {
         public AgentHandler(final Task.Type type, final Link link, final byte[] data) {
             super(type, link, data);
diff --git a/framework/agent-mslb/pom.xml b/framework/agent-mslb/pom.xml
new file mode 100644
index 00000000000..800b723c190
--- /dev/null
+++ b/framework/agent-mslb/pom.xml
@@ -0,0 +1,30 @@
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements. See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership. The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License. You may obtain a copy of the License at
+  http://www.apache.org/licenses/LICENSE-2.0
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied. See the License for the
+  specific language governing permissions and limitations
+  under the License.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <name>Apache CloudStack Agent Management Servers Load Balancer</name>
+    <artifactId>cloud-framework-agent-mslb</artifactId>
+    <parent>
+        <artifactId>cloudstack-framework</artifactId>
+        <groupId>org.apache.cloudstack</groupId>
+        <version>4.12.0.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+</project>
diff --git a/framework/agent-mslb/src/main/java/org/apache/cloudstack/agent/mslb/AgentMSLB.java b/framework/agent-mslb/src/main/java/org/apache/cloudstack/agent/mslb/AgentMSLB.java
new file mode 100644
index 00000000000..07f35ee435a
--- /dev/null
+++ b/framework/agent-mslb/src/main/java/org/apache/cloudstack/agent/mslb/AgentMSLB.java
@@ -0,0 +1,39 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+package org.apache.cloudstack.agent.mslb;
+
+import java.util.List;
+
+public interface AgentMSLB {
+
+    /**
+     * Return list of management server addresses after applying configured MSLB algorithm
+     * @param hostId host id (if present)
+     * @param dcId zone id
+     * @return management servers string list
+     */
+    List<String> getManagementServerList(Long hostId, Long dcId);
+
+    /**
+     * Return true if received management server list is up to date for hostId on dcId
+     * @param hostId host id
+     * @param dcId zone id
+     * @param receivedMgmtHosts received management server list
+     * @return true if mgmtHosts is up to date, false if not
+     */
+    boolean isManagementServerListUpToDate(Long hostId, Long dcId, List<String> receivedMgmtHosts);
+}
\ No newline at end of file
diff --git a/framework/agent-mslb/src/main/java/org/apache/cloudstack/agent/mslb/AgentMSLBAlgorithm.java b/framework/agent-mslb/src/main/java/org/apache/cloudstack/agent/mslb/AgentMSLBAlgorithm.java
new file mode 100644
index 00000000000..f32dba4b24b
--- /dev/null
+++ b/framework/agent-mslb/src/main/java/org/apache/cloudstack/agent/mslb/AgentMSLBAlgorithm.java
@@ -0,0 +1,45 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package org.apache.cloudstack.agent.mslb;
+
+import java.util.List;
+
+public interface AgentMSLBAlgorithm {
+    /**
+     * Returns the management server list to send to host after applying the algorithm
+     * @param msList management server list
+     * @param orderedHostList ordered host list
+     * @param hostId host id
+     * @return returns the list of management server addresses which will be sent to host id
+     */
+    List<String> getMSList(final List<String> msList, final List<Long> orderedHostList, final Long hostId);
+
+    /**
+     * Gets the unique name of the algorithm
+     * @return returns the name of the Agent MSLB algorithm
+     */
+    String getName();
+
+    /**
+     * Compares and return if received mgmt server list is equal to the actual mgmt server lists
+     * @param msList current mgmt server list
+     * @param receivedMsList received mgmt server list
+     * @return true if the lists are equal, false if not
+     */
+    boolean isMSListEqual(final List<String> msList, final List<String> receivedMsList);
+}
diff --git a/framework/pom.xml b/framework/pom.xml
index b7322fe3540..3104c40fc20 100644
--- a/framework/pom.xml
+++ b/framework/pom.xml
@@ -43,6 +43,7 @@
     </plugins>
   </build>
   <modules>
+    <module>agent-mslb</module>
     <module>ipc</module>
     <module>ca</module>
     <module>rest</module>
diff --git a/plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java b/plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java
index 9b7fb2ea013..445d679348d 100644
--- a/plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java
+++ b/plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java
@@ -85,6 +85,7 @@
 import com.cloud.agent.api.PingRoutingWithNwGroupsCommand;
 import com.cloud.agent.api.SetupGuestNetworkCommand;
 import com.cloud.agent.api.StartupCommand;
+import com.cloud.agent.api.StartupMgmtHostsCommand;
 import com.cloud.agent.api.StartupRoutingCommand;
 import com.cloud.agent.api.StartupStorageCommand;
 import com.cloud.agent.api.VmDiskStatsEntry;
@@ -2593,13 +2594,49 @@ public Type getType() {
             s_logger.debug("Unable to initialize local storage pool: " + e);
         }
 
-        if (sscmd != null) {
-            return new StartupCommand[] {cmd, sscmd};
+        StartupMgmtHostsCommand mgmtHostsCommand = null;
+        try {
+            mgmtHostsCommand = getMgmtHostCommand();
+        } catch (ConfigurationException e) {
+            s_logger.error("Error with agent.properties file: " + e);
+        } catch (IOException e) {
+            s_logger.error("Error retrieving properties from agent.properties due to: " + e);
+        }
+
+        if (sscmd != null && mgmtHostsCommand != null) {
+            return new StartupCommand[]{cmd, sscmd, mgmtHostsCommand};
+        } else if (sscmd != null && mgmtHostsCommand == null) {
+            return new StartupCommand[]{cmd, sscmd};
+        } else if (sscmd == null && mgmtHostsCommand != null) {
+            return new StartupCommand[]{cmd, mgmtHostsCommand};
         } else {
             return new StartupCommand[] {cmd};
         }
     }
 
+    /**
+     * Create a StartupMgmtHostsCommand using 'host' property on agent.properties file to be sent to the connected mgmt host
+     * @return StartUpMgmtHostsCommand
+     * @throws ConfigurationException if agent.properties file cannot be found or no hosts specified on agent.properties file
+     * @throws IOException if properties cannot be retrieved from agent.properties file
+     */
+    private StartupMgmtHostsCommand getMgmtHostCommand() throws ConfigurationException, IOException {
+        final File file = PropertiesUtil.findConfigFile("/etc/cloudstack/agent/agent.properties");
+        if (file == null) {
+            throw new ConfigurationException("Unable to find agent.properties.");
+        }
+
+        s_logger.debug("agent.properties found at " + file.getAbsolutePath());
+
+        final Properties properties = PropertiesUtil.loadFromFile(file);
+
+        final String mgmtHosts = (String)properties.get("host");
+        if (mgmtHosts == null) {
+            throw new ConfigurationException("No mgmt hosts specified on agent.properties file");
+        }
+        return new StartupMgmtHostsCommand(mgmtHosts);
+    }
+
     public String diskUuidToSerial(String uuid) {
         String uuidWithoutHyphen = uuid.replace("-","");
         return uuidWithoutHyphen.substring(0, Math.min(uuidWithoutHyphen.length(), 20));
diff --git a/plugins/network-elements/elastic-loadbalancer/src/main/java/com/cloud/network/lb/ElasticLoadBalancerManagerImpl.java b/plugins/network-elements/elastic-loadbalancer/src/main/java/com/cloud/network/lb/ElasticLoadBalancerManagerImpl.java
index d9175548649..78e04b5dc53 100644
--- a/plugins/network-elements/elastic-loadbalancer/src/main/java/com/cloud/network/lb/ElasticLoadBalancerManagerImpl.java
+++ b/plugins/network-elements/elastic-loadbalancer/src/main/java/com/cloud/network/lb/ElasticLoadBalancerManagerImpl.java
@@ -447,7 +447,7 @@ public boolean finalizeVirtualMachineProfile(VirtualMachineProfile profile, Depl
                     if (s_logger.isInfoEnabled()) {
                         s_logger.info("Check if we need to add management server explicit route to ELB vm. pod cidr: " + dest.getPod().getCidrAddress() + "/"
                                 + dest.getPod().getCidrSize() + ", pod gateway: " + dest.getPod().getGateway() + ", management host: "
-                                + ApiServiceConfiguration.ManagementHostIPAdr.value());
+                                + ApiServiceConfiguration.ManagementServerAddresses.value());
                     }
 
                     if (s_logger.isDebugEnabled()) {
diff --git a/server/pom.xml b/server/pom.xml
index 8641703f562..d0f2b813b4d 100644
--- a/server/pom.xml
+++ b/server/pom.xml
@@ -136,6 +136,11 @@
       <artifactId>cloud-engine-components-api</artifactId>
       <version>${project.version}</version>
     </dependency>
+    <dependency>
+      <groupId>org.apache.cloudstack</groupId>
+      <artifactId>cloud-framework-agent-mslb</artifactId>
+      <version>${project.version}</version>
+    </dependency>
     <dependency>
       <groupId>org.opensaml</groupId>
       <artifactId>opensaml</artifactId>
diff --git a/server/src/main/java/com/cloud/configuration/ConfigurationManagerImpl.java b/server/src/main/java/com/cloud/configuration/ConfigurationManagerImpl.java
index 1632da95f95..80642f51375 100755
--- a/server/src/main/java/com/cloud/configuration/ConfigurationManagerImpl.java
+++ b/server/src/main/java/com/cloud/configuration/ConfigurationManagerImpl.java
@@ -76,6 +76,8 @@
 import org.apache.cloudstack.framework.config.Configurable;
 import org.apache.cloudstack.framework.config.dao.ConfigurationDao;
 import org.apache.cloudstack.framework.config.impl.ConfigurationVO;
+import org.apache.cloudstack.framework.messagebus.MessageBus;
+import org.apache.cloudstack.framework.messagebus.PublishScope;
 import org.apache.cloudstack.region.PortableIp;
 import org.apache.cloudstack.region.PortableIpDao;
 import org.apache.cloudstack.region.PortableIpRange;
@@ -352,6 +354,8 @@
     ImageStoreDao _imageStoreDao;
     @Inject
     ImageStoreDetailsDao _imageStoreDetailsDao;
+    @Inject
+    MessageBus messageBus;
 
 
     // FIXME - why don't we have interface for DataCenterLinkLocalIpAddressDao?
@@ -660,6 +664,7 @@ public String updateConfiguration(final long userId, final String name, final St
         }
 
         txn.commit();
+        messageBus.publish(_name, EventTypes.EVENT_CONFIGURATION_VALUE_EDIT, PublishScope.GLOBAL, name);
         return _configDao.getValue(name);
     }
 
diff --git a/server/src/main/java/com/cloud/consoleproxy/ConsoleProxyManagerImpl.java b/server/src/main/java/com/cloud/consoleproxy/ConsoleProxyManagerImpl.java
index 28fff3c7219..c64bca10013 100644
--- a/server/src/main/java/com/cloud/consoleproxy/ConsoleProxyManagerImpl.java
+++ b/server/src/main/java/com/cloud/consoleproxy/ConsoleProxyManagerImpl.java
@@ -29,7 +29,7 @@
 import javax.inject.Inject;
 import javax.naming.ConfigurationException;
 
-import org.apache.cloudstack.config.ApiServiceConfiguration;
+import org.apache.cloudstack.agent.mslb.AgentMSLB;
 import org.apache.cloudstack.context.CallContext;
 import org.apache.cloudstack.engine.orchestration.service.NetworkOrchestrationService;
 import org.apache.cloudstack.framework.config.dao.ConfigurationDao;
@@ -211,6 +211,8 @@
     private KeysManager _keysMgr;
     @Inject
     private VirtualMachineManager _itMgr;
+    @Inject
+    private AgentMSLB agentMSLB;
 
     private ConsoleProxyListener _listener;
 
@@ -1355,7 +1357,7 @@ public boolean finalizeVirtualMachineProfile(VirtualMachineProfile profile, Depl
 
         StringBuilder buf = profile.getBootArgsBuilder();
         buf.append(" template=domP type=consoleproxy");
-        buf.append(" host=").append(StringUtils.shuffleCSVList(ApiServiceConfiguration.ManagementHostIPAdr.value()));
+        buf.append(" host=").append(StringUtils.toCSVList(agentMSLB.getManagementServerList(dest.getHost().getId(), dest.getDataCenter().getId())));
         buf.append(" port=").append(_mgmtPort);
         buf.append(" name=").append(profile.getVirtualMachine().getHostName());
         if (_sslEnabled) {
diff --git a/server/src/main/java/com/cloud/hypervisor/kvm/discoverer/LibvirtServerDiscoverer.java b/server/src/main/java/com/cloud/hypervisor/kvm/discoverer/LibvirtServerDiscoverer.java
index 63a44b83518..2f99aa7dc73 100644
--- a/server/src/main/java/com/cloud/hypervisor/kvm/discoverer/LibvirtServerDiscoverer.java
+++ b/server/src/main/java/com/cloud/hypervisor/kvm/discoverer/LibvirtServerDiscoverer.java
@@ -27,9 +27,9 @@
 import javax.inject.Inject;
 import javax.naming.ConfigurationException;
 
+import org.apache.cloudstack.agent.mslb.AgentMSLB;
 import org.apache.cloudstack.ca.CAManager;
 import org.apache.cloudstack.ca.SetupCertificateCommand;
-import org.apache.cloudstack.config.ApiServiceConfiguration;
 import org.apache.cloudstack.framework.ca.Certificate;
 import org.apache.cloudstack.utils.security.KeyStoreUtils;
 import org.apache.log4j.Logger;
@@ -75,6 +75,8 @@
     private AgentManager agentMgr;
     @Inject
     private CAManager caManager;
+    @Inject
+    private AgentMSLB agentMSLB;
 
     @Override
     public abstract Hypervisor.HypervisorType getHypervisorType();
@@ -291,7 +293,7 @@ private void setupAgentSecurity(final Connection sshConnection, final String age
 
             setupAgentSecurity(sshConnection, agentIp, hostname);
 
-            String parameters = " -m " + StringUtils.shuffleCSVList(ApiServiceConfiguration.ManagementHostIPAdr.value()) + " -z " + dcId + " -p " + podId + " -c " + clusterId + " -g " + guid + " -a";
+            String parameters = " -m " + StringUtils.toCSVList(agentMSLB.getManagementServerList(null, dcId)) + " -z " + dcId + " -p " + podId + " -c " + clusterId + " -g " + guid + " -a";
 
             parameters += " --pubNic=" + kvmPublicNic;
             parameters += " --prvNic=" + kvmPrivateNic;
diff --git a/server/src/main/java/com/cloud/network/router/VirtualNetworkApplianceManagerImpl.java b/server/src/main/java/com/cloud/network/router/VirtualNetworkApplianceManagerImpl.java
index f3035d05e61..1985deaefa8 100644
--- a/server/src/main/java/com/cloud/network/router/VirtualNetworkApplianceManagerImpl.java
+++ b/server/src/main/java/com/cloud/network/router/VirtualNetworkApplianceManagerImpl.java
@@ -1373,7 +1373,7 @@ public boolean finalizeVirtualMachineProfile(final VirtualMachineProfile profile
                 if (dest.getHost().getHypervisorType() == HypervisorType.VMware || dest.getHost().getHypervisorType() == HypervisorType.Hyperv) {
                     s_logger.info("Check if we need to add management server explicit route to DomR. pod cidr: " + dest.getPod().getCidrAddress() + "/"
                             + dest.getPod().getCidrSize() + ", pod gateway: " + dest.getPod().getGateway() + ", management host: "
-                            + ApiServiceConfiguration.ManagementHostIPAdr.value());
+                            + ApiServiceConfiguration.ManagementServerAddresses.value());
 
                     if (s_logger.isInfoEnabled()) {
                         s_logger.info("Add management server explicit route to DomR.");
@@ -1484,7 +1484,7 @@ public boolean finalizeVirtualMachineProfile(final VirtualMachineProfile profile
             } else {
                 buf.append(String.format(" baremetalnotificationsecuritykey=%s", user.getSecretKey()));
                 buf.append(String.format(" baremetalnotificationapikey=%s", user.getApiKey()));
-                buf.append(" host=").append(ApiServiceConfiguration.ManagementHostIPAdr.value());
+                buf.append(" host=").append(ApiServiceConfiguration.ManagementServerAddresses.value());
                 buf.append(" port=").append(_configDao.getValue(Config.BaremetalProvisionDoneNotificationPort.key()));
             }
         }
diff --git a/server/src/main/java/com/cloud/resource/ResourceManagerImpl.java b/server/src/main/java/com/cloud/resource/ResourceManagerImpl.java
index 2966d41d8bf..0f8bd49d231 100755
--- a/server/src/main/java/com/cloud/resource/ResourceManagerImpl.java
+++ b/server/src/main/java/com/cloud/resource/ResourceManagerImpl.java
@@ -253,6 +253,7 @@ public void setDiscoverers(final List<? extends Discoverer> discoverers) {
     @Inject
     private ClusterVSMMapDao _clusterVSMMapDao;
 
+
     private final long _nodeId = ManagementServerNode.getManagementServerId();
 
     private final HashMap<String, ResourceStateAdapter> _resourceStateAdapters = new HashMap<String, ResourceStateAdapter>();
diff --git a/server/src/main/java/com/cloud/server/ConfigurationServerImpl.java b/server/src/main/java/com/cloud/server/ConfigurationServerImpl.java
index e348051cb0d..197ebed3e69 100644
--- a/server/src/main/java/com/cloud/server/ConfigurationServerImpl.java
+++ b/server/src/main/java/com/cloud/server/ConfigurationServerImpl.java
@@ -246,14 +246,14 @@ public void persistDefaultValues() throws InternalErrorException {
             if (hostIpAdr != null) {
                 Boolean devel = Boolean.valueOf(_configDao.getValue("developer"));
                 if (devel) {
-                    String value = _configDao.getValue(ApiServiceConfiguration.ManagementHostIPAdr.key());
+                    String value = _configDao.getValue(ApiServiceConfiguration.ManagementServerAddresses.key());
                     if (value != null && !value.equals("localhost")) {
                         needUpdateHostIp = false;
                     }
                 }
 
                 if (needUpdateHostIp) {
-                    _configDepot.createOrUpdateConfigObject(ApiServiceConfiguration.class.getSimpleName(), ApiServiceConfiguration.ManagementHostIPAdr, hostIpAdr);
+                    _configDepot.createOrUpdateConfigObject(ApiServiceConfiguration.class.getSimpleName(), ApiServiceConfiguration.ManagementServerAddresses, hostIpAdr);
                     s_logger.debug("ConfigurationServer saved \"" + hostIpAdr + "\" as host.");
                 }
             }
diff --git a/server/src/main/java/org/apache/cloudstack/agent/mslb/AgentMSLBServiceImpl.java b/server/src/main/java/org/apache/cloudstack/agent/mslb/AgentMSLBServiceImpl.java
new file mode 100644
index 00000000000..86b1b3fd1e9
--- /dev/null
+++ b/server/src/main/java/org/apache/cloudstack/agent/mslb/AgentMSLBServiceImpl.java
@@ -0,0 +1,236 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+package org.apache.cloudstack.agent.mslb;
+
+import com.cloud.agent.AgentManager;
+import com.cloud.agent.api.Answer;
+import com.cloud.event.EventTypes;
+import com.cloud.host.Host;
+import com.cloud.host.HostVO;
+import com.cloud.hypervisor.Hypervisor;
+import com.cloud.resource.ResourceListener;
+import com.cloud.resource.ResourceManager;
+import com.cloud.resource.ResourceState;
+import com.cloud.resource.ServerResource;
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import java.util.stream.Collectors;
+import javax.inject.Inject;
+import javax.naming.ConfigurationException;
+
+import org.apache.cloudstack.agent.mslb.algorithm.AgentMSLBRoundRobinAlgorithm;
+import org.apache.cloudstack.agent.mslb.algorithm.AgentMSLBShuffleAlgorithm;
+import org.apache.cloudstack.agent.mslb.algorithm.AgentMSLBStaticAlgorithm;
+import org.apache.cloudstack.config.ApiServiceConfiguration;
+import org.apache.cloudstack.framework.config.ConfigKey;
+import org.apache.cloudstack.framework.config.Configurable;
+import org.apache.cloudstack.framework.messagebus.MessageBus;
+import org.apache.log4j.Logger;
+
+import com.cloud.utils.component.ComponentLifecycleBase;
+import com.cloud.utils.exception.CloudRuntimeException;
+import com.google.common.base.Strings;
+
+public class AgentMSLBServiceImpl extends ComponentLifecycleBase implements AgentMSLB, Configurable, ResourceListener {
+    public static final Logger LOG = Logger.getLogger(AgentMSLBServiceImpl.class);
+
+    public static final ConfigKey<String> ConnectedAgentLBAlgorithm = new ConfigKey<>("Advanced", String.class,
+            "connected.agent.mslb.algorithm", "static",
+            "The algorithm to applied on the provided 'host' management server list that is sent to indirect agents. Allowed values are: static, roundrobin and shuffle.",
+            true, ConfigKey.Scope.Global);
+
+    private static Map<String, AgentMSLBAlgorithm> algorithmMap = new HashMap<>();
+
+    @Inject
+    ResourceManager resourceManager;
+    @Inject
+    MessageBus messageBus;
+    @Inject
+    AgentManager agentManager;
+
+    /**
+     * Return a map of (zoneid, list of host ids)
+     * @return map
+     */
+    protected Map<Long, List<Long>> getHostsPerZone() {
+        List<HostVO> allHosts = resourceManager.listAllHostsInAllZonesByType(Host.Type.Routing);
+        if (allHosts == null) {
+            return null;
+        }
+        return allHosts.stream()
+                .collect(
+                        Collectors.groupingBy(
+                               HostVO::getDataCenterId,
+                               Collectors.mapping(HostVO::getId, Collectors.toList()
+                        )));
+    }
+
+    /**
+     * Propagate management servers lists to agents
+     */
+    private void propagateListToAgents() {
+        LOG.debug("Propagating management lists to agents");
+        Map<Long, List<Long>> hostsPerZone = getHostsPerZone();
+        for (Long zoneId : hostsPerZone.keySet()) {
+            List<Long> hostIds = hostsPerZone.get(zoneId);
+            for (Long hostId : hostIds) {
+                List<String> msList = getManagementServerList(hostId, zoneId);
+                SetupManagementServersListCommand cmd = new SetupManagementServersListCommand(msList);
+                Answer answer = agentManager.easySend(hostId, cmd);
+                if (answer == null || !answer.getResult()) {
+                    LOG.warn("Error sending management servers list to agent" + hostId);
+                }
+            }
+        }
+    }
+
+    private void initMessageBusListener() {
+        messageBus.subscribe(EventTypes.EVENT_CONFIGURATION_VALUE_EDIT, (senderAddress, subject, args) -> {
+            String globalSettingUpdated = (String) args;
+            if (globalSettingUpdated.equals(ApiServiceConfiguration.ManagementServerAddresses.key()) ||
+                    globalSettingUpdated.equals(ConnectedAgentLBAlgorithm.key())) {
+                propagateListToAgents();
+            }
+        });
+    }
+
+    @Override
+    public List<String> getManagementServerList(Long hostId, Long dcId) {
+        final String msServerAddresses = ApiServiceConfiguration.ManagementServerAddresses.value();
+        if (Strings.isNullOrEmpty(msServerAddresses)) {
+            throw new CloudRuntimeException(String.format("No management server addresses are defined in '%s' setting",
+                    ApiServiceConfiguration.ManagementServerAddresses.key()));
+        }
+
+        List<Long> orderedHostIds = getOrderedRunningHostIds(dcId);
+        List<String> msList = Arrays.asList(msServerAddresses.replace(" ", "").split(","));
+        AgentMSLBAlgorithm algorithm = getAgentMSLBAlgorithm();
+        return algorithm.getMSList(msList, orderedHostIds, hostId);
+    }
+
+    @Override
+    public boolean isManagementServerListUpToDate(Long hostId, Long dcId, List<String> receivedMgmtHosts) {
+        List<String> managementServerList = getManagementServerList(hostId, dcId);
+        AgentMSLBAlgorithm algorithm = getAgentMSLBAlgorithm();
+        return algorithm.isMSListEqual(managementServerList, receivedMgmtHosts);
+    }
+
+    protected List<Long> getOrderedRunningHostIds(Long dcId) {
+        List<HostVO> hosts = resourceManager.listAllHostsInOneZoneByType(Host.Type.Routing, dcId);
+        if (hosts != null) {
+            return hosts.stream()
+                    .filter(x -> !x.getHypervisorType().equals(Hypervisor.HypervisorType.VMware) &&
+                                    !x.getHypervisorType().equals(Hypervisor.HypervisorType.XenServer) &&
+                                    !x.getHypervisorType().equals(Hypervisor.HypervisorType.Hyperv) &&
+                                    x.getRemoved() == null && x.getResourceState().equals(ResourceState.Enabled))
+                    .map(x -> x.getId())
+                    .sorted((x,y) -> Long.compare(x, y))
+                    .collect(Collectors.toList());
+        }
+        return null;
+    }
+
+    private AgentMSLBAlgorithm getAgentMSLBAlgorithm() {
+        final String algorithm = ConnectedAgentLBAlgorithm.value();
+        if (algorithmMap.containsKey(algorithm)) {
+            return algorithmMap.get(algorithm);
+        }
+        throw new CloudRuntimeException(String.format("Algorithm configured for '%s' not found, valid values are: %s",
+                ConnectedAgentLBAlgorithm.key(), algorithmMap.keySet()));
+    }
+
+    private void initAlgorithmMap() {
+        final List<AgentMSLBAlgorithm> algorithms = new ArrayList<>();
+        algorithms.add(new AgentMSLBStaticAlgorithm());
+        algorithms.add(new AgentMSLBRoundRobinAlgorithm());
+        algorithms.add(new AgentMSLBShuffleAlgorithm());
+        algorithmMap.clear();
+        for (AgentMSLBAlgorithm algorithm : algorithms) {
+            algorithmMap.put(algorithm.getName(), algorithm);
+        }
+    }
+
+    @Override
+    public boolean configure(final String name, final Map<String, Object> params) throws ConfigurationException {
+        super.configure(name, params);
+        initAlgorithmMap();
+        initMessageBusListener();
+        return true;
+    }
+
+    @Override
+    public boolean start() {
+        resourceManager.registerResourceEvent(ResourceListener.EVENT_DISCOVER_AFTER, this);
+        return true;
+    }
+
+    @Override
+    public boolean stop() {
+        resourceManager.unregisterResourceEvent(this);
+        return true;
+    }
+
+    @Override
+    public String getConfigComponentName() {
+        return AgentMSLBServiceImpl.class.getSimpleName();
+    }
+
+    @Override
+    public ConfigKey<?>[] getConfigKeys() {
+        return new ConfigKey<?>[] {
+                ConnectedAgentLBAlgorithm
+        };
+    }
+
+    @Override
+    public void processDiscoverEventBefore(Long dcid, Long podId, Long clusterId, URI uri, String username, String password, List<String> hostTags) {
+    }
+
+    @Override
+    public void processDiscoverEventAfter(Map<? extends ServerResource, Map<String, String>> resources) {
+        propagateListToAgents();
+    }
+
+    @Override
+    public void processDeleteHostEventBefore(Host host) {
+    }
+
+    @Override
+    public void processDeletHostEventAfter(Host host) {
+    }
+
+    @Override
+    public void processCancelMaintenaceEventBefore(Long hostId) {
+    }
+
+    @Override
+    public void processCancelMaintenaceEventAfter(Long hostId) {
+    }
+
+    @Override
+    public void processPrepareMaintenaceEventBefore(Long hostId) {
+    }
+
+    @Override
+    public void processPrepareMaintenaceEventAfter(Long hostId) {
+    }
+}
\ No newline at end of file
diff --git a/server/src/main/java/org/apache/cloudstack/agent/mslb/algorithm/AgentMSLBRoundRobinAlgorithm.java b/server/src/main/java/org/apache/cloudstack/agent/mslb/algorithm/AgentMSLBRoundRobinAlgorithm.java
new file mode 100644
index 00000000000..53eb557d2e8
--- /dev/null
+++ b/server/src/main/java/org/apache/cloudstack/agent/mslb/algorithm/AgentMSLBRoundRobinAlgorithm.java
@@ -0,0 +1,94 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+package org.apache.cloudstack.agent.mslb.algorithm;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.cloudstack.agent.mslb.AgentMSLBAlgorithm;
+
+public class AgentMSLBRoundRobinAlgorithm implements AgentMSLBAlgorithm {
+
+    private static final long LAST_ID_FOR_NOT_EXISTING_HOSTS = 0l;
+
+    /**
+     * Get RR index for a hostId depending on its order in the hosts list
+     * @param msList
+     * @param orderedHostList
+     * @param hostId
+     * @return
+     */
+    private int findRoundRobinIndexForHost(final List<String> msList, final List<Long> orderedHostList, final Long hostId) {
+        return orderedHostList.indexOf(hostId) % msList.size();
+    }
+
+    /**
+     * When discovering new hosts there is no host id on DB, in order to apply RR algorithm an entry is added at the end of the hosts list
+     * @param hostId host id
+     * @param orderedHostList hosts list
+     * @return added id on the list if hostId is null, hostId if not
+     */
+    private Long getHostForRoundRobinAlgorithm(Long hostId, List<Long> orderedHostList) {
+        if (hostId == null) {
+            orderedHostList.add(LAST_ID_FOR_NOT_EXISTING_HOSTS);
+            return LAST_ID_FOR_NOT_EXISTING_HOSTS;
+        }
+        return hostId;
+    }
+
+    /**
+     * If an entry was added at the end of the list it is removed (when hostId is null)
+     * @param hostId host id
+     * @param orderedHostList hosts list
+     */
+    private void revertChangesAfterApplyingRoundRobinAlgorithm(Long hostId, List<Long> orderedHostList) {
+        if (hostId == null) {
+            orderedHostList.remove(orderedHostList.size()-1);
+        }
+    }
+
+    @Override
+    public List<String> getMSList(final List<String> msList, final List<Long> orderedHostList, final Long hostId) {
+        if (msList.size() < 2) {
+            return msList;
+        }
+        Long host = getHostForRoundRobinAlgorithm(hostId, orderedHostList);
+
+        final int currentRRIndex = findRoundRobinIndexForHost(msList, orderedHostList, host);
+        final List<String> roundRobin = new ArrayList<>(msList.subList(currentRRIndex, msList.size()));
+        roundRobin.addAll(msList.subList(0, currentRRIndex));
+
+        revertChangesAfterApplyingRoundRobinAlgorithm(hostId, orderedHostList);
+        return roundRobin;
+    }
+
+    @Override
+    public String getName() {
+        return "roundrobin";
+    }
+
+    @Override
+    public boolean isMSListEqual(List<String> msList, List<String> receivedMsList) {
+        if (msList.size() != receivedMsList.size()) return false;
+        for (int i = 0; i < msList.size(); i++) {
+            if (!msList.get(i).equals(receivedMsList.get(i))) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
\ No newline at end of file
diff --git a/server/src/main/java/org/apache/cloudstack/agent/mslb/algorithm/AgentMSLBShuffleAlgorithm.java b/server/src/main/java/org/apache/cloudstack/agent/mslb/algorithm/AgentMSLBShuffleAlgorithm.java
new file mode 100644
index 00000000000..bf639d360c2
--- /dev/null
+++ b/server/src/main/java/org/apache/cloudstack/agent/mslb/algorithm/AgentMSLBShuffleAlgorithm.java
@@ -0,0 +1,44 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+package org.apache.cloudstack.agent.mslb.algorithm;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Random;
+import org.apache.cloudstack.agent.mslb.AgentMSLBAlgorithm;
+import org.apache.commons.collections.SetUtils;
+
+public class AgentMSLBShuffleAlgorithm implements AgentMSLBAlgorithm {
+
+    @Override
+    public List<String> getMSList(final List<String> msList, final List<Long> orderedHostList, final Long hostId) {
+        final List<String> randomList = new ArrayList<>(msList);
+        Collections.shuffle(randomList, new Random(System.currentTimeMillis()));
+        return randomList;
+    }
+
+    @Override
+    public String getName() {
+        return "shuffle";
+    }
+
+    @Override
+    public boolean isMSListEqual(List<String> msList, List<String> receivedMsList) {
+        return SetUtils.isEqualSet(msList, receivedMsList);
+    }
+}
\ No newline at end of file
diff --git a/server/src/main/java/org/apache/cloudstack/agent/mslb/algorithm/AgentMSLBStaticAlgorithm.java b/server/src/main/java/org/apache/cloudstack/agent/mslb/algorithm/AgentMSLBStaticAlgorithm.java
new file mode 100644
index 00000000000..4beeca1aefb
--- /dev/null
+++ b/server/src/main/java/org/apache/cloudstack/agent/mslb/algorithm/AgentMSLBStaticAlgorithm.java
@@ -0,0 +1,46 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+package org.apache.cloudstack.agent.mslb.algorithm;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.cloudstack.agent.mslb.AgentMSLBAlgorithm;
+
+public class AgentMSLBStaticAlgorithm implements AgentMSLBAlgorithm {
+
+    @Override
+    public List<String> getMSList(final List<String> msList, final List<Long> orderedHostList, final Long hostId) {
+        return new ArrayList<>(msList);
+    }
+
+    @Override
+    public String getName() {
+        return "static";
+    }
+
+    @Override
+    public boolean isMSListEqual(List<String> msList, List<String> receivedMsList) {
+        if (msList.size() != receivedMsList.size()) return false;
+        for (int i = 0; i < msList.size(); i++) {
+            if (!msList.get(i).equals(receivedMsList.get(i))) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
\ No newline at end of file
diff --git a/server/src/main/resources/META-INF/cloudstack/core/spring-server-core-managers-context.xml b/server/src/main/resources/META-INF/cloudstack/core/spring-server-core-managers-context.xml
index 7d19b1e2f46..8834bd03fde 100644
--- a/server/src/main/resources/META-INF/cloudstack/core/spring-server-core-managers-context.xml
+++ b/server/src/main/resources/META-INF/cloudstack/core/spring-server-core-managers-context.xml
@@ -296,4 +296,7 @@
     <bean id="annotationService" class="org.apache.cloudstack.annotation.AnnotationManagerImpl" />
 
     <bean id="directDownloadManager" class="org.apache.cloudstack.direct.download.DirectDownloadManagerImpl" />
+
+    <bean id="agentMSLB" class="org.apache.cloudstack.agent.mslb.AgentMSLBServiceImpl" />
+
 </beans>
diff --git a/server/src/test/resources/createNetworkOffering.xml b/server/src/test/resources/createNetworkOffering.xml
index 126e265682b..1a3bad166b4 100644
--- a/server/src/test/resources/createNetworkOffering.xml
+++ b/server/src/test/resources/createNetworkOffering.xml
@@ -54,4 +54,5 @@
     <bean id="userIpAddressDetailsDao" class="org.apache.cloudstack.resourcedetail.dao.UserIpAddressDetailsDaoImpl" />
     <bean id="loadBalancerVMMapDaoImpl" class="com.cloud.network.dao.LoadBalancerVMMapDaoImpl" />
     <bean id="imageStoreDaoImpl" class="org.apache.cloudstack.storage.datastore.db.ImageStoreDaoImpl" />
+    <bean id="messageBus" class="org.apache.cloudstack.framework.messagebus.MessageBusBase" />
 </beans>
diff --git a/server/test/org/apache/cloudstack/agent/mslb/AgentMSLBServiceImplTest.java b/server/test/org/apache/cloudstack/agent/mslb/AgentMSLBServiceImplTest.java
new file mode 100644
index 00000000000..d064a7efd6a
--- /dev/null
+++ b/server/test/org/apache/cloudstack/agent/mslb/AgentMSLBServiceImplTest.java
@@ -0,0 +1,243 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+package org.apache.cloudstack.agent.mslb;
+
+import com.cloud.agent.AgentManager;
+import com.cloud.host.Host;
+import com.cloud.host.HostVO;
+import com.cloud.hypervisor.Hypervisor;
+import com.cloud.resource.ResourceManager;
+import com.cloud.resource.ResourceState;
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.cloudstack.config.ApiServiceConfiguration;
+import org.apache.cloudstack.framework.config.ConfigKey;
+import org.apache.cloudstack.framework.messagebus.MessageBus;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.InjectMocks;
+import org.mockito.MockitoAnnotations;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.mockito.Mockito.when;
+
+import com.cloud.utils.exception.CloudRuntimeException;
+
+public class AgentMSLBServiceImplTest {
+
+    @Mock
+    ResourceManager resourceManager;
+    @Mock
+    MessageBus messageBus;
+    @Mock
+    AgentManager agentManager;
+
+    @Mock
+    HostVO host1;
+    @Mock
+    HostVO host2;
+    @Mock
+    HostVO host3;
+    @Mock
+    HostVO host4;
+
+    @Spy
+    @InjectMocks
+    private AgentMSLBServiceImpl agentMgmtLB = new AgentMSLBServiceImpl();
+
+    private final String msCSVList = "192.168.10.10, 192.168.10.11, 192.168.10.12";
+    private final List<String> msList = Arrays.asList(msCSVList.replace(" ","").split(","));
+
+    private static final long DC_1_ID = 1L;
+    private static final long DC_2_ID = 2L;
+
+    private void overrideDefaultConfigValue(final ConfigKey configKey, final String name, final Object o) throws IllegalAccessException, NoSuchFieldException {
+        final Field f = ConfigKey.class.getDeclaredField(name);
+        f.setAccessible(true);
+        f.set(configKey, o);
+    }
+
+    private void configureMocks() {
+        long id = 1;
+        for (HostVO h : Arrays.asList(host1, host2, host3, host4)) {
+            when(h.getId()).thenReturn(id);
+            when(h.getDataCenterId()).thenReturn(DC_1_ID);
+            when(h.getHypervisorType()).thenReturn(Hypervisor.HypervisorType.KVM);
+            when(h.getRemoved()).thenReturn(null);
+            when(h.getResourceState()).thenReturn(ResourceState.Enabled);
+            id++;
+        }
+        when(resourceManager.listAllHostsInOneZoneByType(Host.Type.Routing, DC_1_ID))
+                .thenReturn(Arrays.asList(host4, host2, host1, host3));
+        when(resourceManager.listAllHostsInAllZonesByType(Host.Type.Routing)).thenReturn(Arrays.asList(host4, host3, host1, host2));
+    }
+
+    @Before
+    public void setUp() throws Exception {
+        MockitoAnnotations.initMocks(this);
+        configureMocks();
+        agentMgmtLB.configure("someName", null);
+        overrideDefaultConfigValue(ApiServiceConfiguration.ManagementServerAddresses, "_defaultValue", msCSVList);
+    }
+
+    @Test
+    public void testStaticLBSetting() throws NoSuchFieldException, IllegalAccessException {
+        overrideDefaultConfigValue(AgentMSLBServiceImpl.ConnectedAgentLBAlgorithm, "_defaultValue", "static");
+        //Assert that each host receives the same list when algorithm is static, therefore, the same primary host
+        for (HostVO hostVO : Arrays.asList(host1, host2, host3, host4)) {
+            List<String> listToSend = agentMgmtLB.getManagementServerList(hostVO.getId(), hostVO.getDataCenterId());
+            Assert.assertEquals(msList, listToSend);
+            Assert.assertEquals(msList.get(0), listToSend.get(0));
+        }
+    }
+
+    @Test
+    public void testStaticLBSettingNullHostId() throws NoSuchFieldException, IllegalAccessException {
+        overrideDefaultConfigValue(AgentMSLBServiceImpl.ConnectedAgentLBAlgorithm, "_defaultValue", "static");
+        //Assert new agents will be setup with the same list as existing hosts
+        List<String> listToSend = agentMgmtLB.getManagementServerList(host2.getId(), host2.getDataCenterId());
+        Assert.assertEquals(listToSend, agentMgmtLB.getManagementServerList(null, DC_1_ID));
+    }
+
+    private void testRoundRobinForExistingHosts(List<String> list) {
+        for (HostVO hostVO : Arrays.asList(host1, host2, host3, host4)) {
+            List<String> listToSend = agentMgmtLB.getManagementServerList(hostVO.getId(), hostVO.getDataCenterId());
+            Assert.assertEquals(list, listToSend);
+            Assert.assertEquals(list.get(0), listToSend.get(0));
+            list.add(list.get(0));
+            list.remove(0);
+        }
+    }
+    @Test
+    public void testRoundRobinLBSettingConnectedAgents() throws NoSuchFieldException, IllegalAccessException {
+        overrideDefaultConfigValue(AgentMSLBServiceImpl.ConnectedAgentLBAlgorithm, "_defaultValue", "roundrobin");
+        List<String> list = new ArrayList<>(msList);
+        testRoundRobinForExistingHosts(list);
+    }
+
+    @Test
+    public void testRoundRobinDeterministicOrder() throws NoSuchFieldException, IllegalAccessException {
+        overrideDefaultConfigValue(AgentMSLBServiceImpl.ConnectedAgentLBAlgorithm, "_defaultValue", "roundrobin");
+        //Assert that host order is deterministic for round robin. i.e. a given host receives the same list (order is given by host id)
+        List<String> listHost2 = agentMgmtLB.getManagementServerList(host2.getId(), host2.getDataCenterId());
+        Assert.assertEquals(listHost2, agentMgmtLB.getManagementServerList(host2.getId(), host2.getDataCenterId()));
+    }
+
+    @Test
+    public void testRoundRobinLBSettingNullHostId() throws NoSuchFieldException, IllegalAccessException {
+        overrideDefaultConfigValue(AgentMSLBServiceImpl.ConnectedAgentLBAlgorithm, "_defaultValue", "roundrobin");
+        //Assert new agents will be setup with list assuming new host has the greatest id
+        List<String> list = new ArrayList<>(msList);
+        testRoundRobinForExistingHosts(list);
+        List<String> listToSend = agentMgmtLB.getManagementServerList(null, DC_1_ID);
+        Assert.assertEquals(list, listToSend);
+        Assert.assertEquals(list.get(0), listToSend.get(0));
+        list.add(list.get(0));
+        list.remove(0);
+    }
+
+    @Test
+    public void testShuffleLBSetting() throws NoSuchFieldException, IllegalAccessException {
+        overrideDefaultConfigValue(AgentMSLBServiceImpl.ConnectedAgentLBAlgorithm, "_defaultValue", "shuffle");
+        List<String> shuffleListHost2 = agentMgmtLB.getManagementServerList(host2.getId(), host2.getDataCenterId());
+        Assert.assertEquals(new HashSet<>(msList), new HashSet<>(shuffleListHost2));
+    }
+
+    @Test
+    public void testShuffleLBSettingNullHostId() throws NoSuchFieldException, IllegalAccessException {
+        overrideDefaultConfigValue(AgentMSLBServiceImpl.ConnectedAgentLBAlgorithm, "_defaultValue", "shuffle");
+        Assert.assertEquals(new HashSet<>(msList), new HashSet<>(agentMgmtLB.getManagementServerList(null, DC_1_ID)));
+    }
+
+    @Test(expected = CloudRuntimeException.class)
+    public void testInvalidAlgorithmSetting() throws NoSuchFieldException, IllegalAccessException {
+        overrideDefaultConfigValue(AgentMSLBServiceImpl.ConnectedAgentLBAlgorithm, "_defaultValue", "invalid-algo");
+        agentMgmtLB.getManagementServerList(host1.getId(), host1.getDataCenterId());
+    }
+
+    @Test(expected = CloudRuntimeException.class)
+    public void testExceptionOnEmptyHostSetting() throws NoSuchFieldException, IllegalAccessException {
+        overrideDefaultConfigValue(ApiServiceConfiguration.ManagementServerAddresses, "_defaultValue", "");
+        // This should throw exception
+        agentMgmtLB.getManagementServerList(host1.getId(), host1.getDataCenterId());
+    }
+
+    @Test
+    public void testGetOrderedRunningHostIdsNullList() {
+        when(resourceManager.listAllHostsInOneZoneByType(Host.Type.Routing, DC_1_ID)).thenReturn(null);
+        Assert.assertNull(agentMgmtLB.getOrderedRunningHostIds(DC_1_ID));
+    }
+
+    @Test
+    public void testGetOrderedRunningHostIdsEmptyList() {
+        when(resourceManager.listAllHostsInOneZoneByType(Host.Type.Routing, DC_1_ID))
+                .thenReturn(new ArrayList<HostVO>());
+        Assert.assertEquals(new ArrayList<>(), agentMgmtLB.getOrderedRunningHostIds(DC_1_ID));
+    }
+
+    @Test
+    public void testGetOrderedRunningHostIdsOrderList() {
+        when(resourceManager.listAllHostsInOneZoneByType(Host.Type.Routing, DC_1_ID))
+                .thenReturn(Arrays.asList(host4, host2, host1, host3));
+        Assert.assertEquals(Arrays.asList(host1.getId(), host2.getId(), host3.getId(), host4.getId()),
+                agentMgmtLB.getOrderedRunningHostIds(DC_1_ID));
+    }
+
+    @Test
+    public void testGetHostsPerZoneAllHostsInOneZone() {
+        Map<Long, List<Long>> hostsPerZone = agentMgmtLB.getHostsPerZone();
+        Assert.assertEquals(1, hostsPerZone.keySet().size());
+        Assert.assertTrue(hostsPerZone.containsKey(DC_1_ID));
+        Assert.assertEquals(new HashSet<>(Arrays.asList(host1.getId(), host2.getId(), host3.getId(), host4.getId())),
+                new HashSet<>(hostsPerZone.get(DC_1_ID)));
+    }
+
+    @Test
+    public void testGetHostsPerZoneHostsInDifferentZones() {
+        when(host2.getDataCenterId()).thenReturn(DC_2_ID);
+        when(host4.getDataCenterId()).thenReturn(DC_2_ID);
+        Map<Long, List<Long>> hostsPerZone = agentMgmtLB.getHostsPerZone();
+        Assert.assertEquals(2, hostsPerZone.keySet().size());
+        Assert.assertTrue(hostsPerZone.containsKey(DC_1_ID));
+        Assert.assertTrue(hostsPerZone.containsKey(DC_2_ID));
+        Assert.assertEquals(new HashSet<>(Arrays.asList(host1.getId(), host3.getId())),
+                new HashSet<>(hostsPerZone.get(DC_1_ID)));
+        Assert.assertEquals(new HashSet<>(Arrays.asList(host2.getId(), host4.getId())),
+                new HashSet<>(hostsPerZone.get(DC_2_ID)));
+    }
+
+    @Test
+    public void testGetHostsPerZoneNullHosts() {
+        when(resourceManager.listAllHostsInAllZonesByType(Host.Type.Routing)).thenReturn(null);
+        Assert.assertNull(agentMgmtLB.getHostsPerZone());
+    }
+
+    @Test
+    public void testGetHostsPerZoneEmptyHosts() {
+        when(resourceManager.listAllHostsInAllZonesByType(Host.Type.Routing)).thenReturn(new ArrayList<>());
+        Map<Long, List<Long>> map = agentMgmtLB.getHostsPerZone();
+        Assert.assertNotNull(map);
+        Assert.assertTrue(map.isEmpty());
+    }
+}
\ No newline at end of file
diff --git a/services/secondary-storage/controller/src/main/java/org/apache/cloudstack/secondarystorage/SecondaryStorageManagerImpl.java b/services/secondary-storage/controller/src/main/java/org/apache/cloudstack/secondarystorage/SecondaryStorageManagerImpl.java
index a158c9c0e68..5a6eec4a6b2 100644
--- a/services/secondary-storage/controller/src/main/java/org/apache/cloudstack/secondarystorage/SecondaryStorageManagerImpl.java
+++ b/services/secondary-storage/controller/src/main/java/org/apache/cloudstack/secondarystorage/SecondaryStorageManagerImpl.java
@@ -30,7 +30,7 @@
 import javax.inject.Inject;
 import javax.naming.ConfigurationException;
 
-import org.apache.cloudstack.config.ApiServiceConfiguration;
+import org.apache.cloudstack.agent.mslb.AgentMSLB;
 import org.apache.cloudstack.context.CallContext;
 import org.apache.cloudstack.engine.orchestration.service.NetworkOrchestrationService;
 import org.apache.cloudstack.engine.subsystem.api.storage.DataStore;
@@ -89,12 +89,12 @@
 import com.cloud.network.Network;
 import com.cloud.network.NetworkModel;
 import com.cloud.network.Networks.TrafficType;
+import com.cloud.network.StorageNetworkManager;
 import com.cloud.network.dao.IPAddressDao;
 import com.cloud.network.dao.IPAddressVO;
 import com.cloud.network.dao.NetworkDao;
 import com.cloud.network.dao.NetworkVO;
 import com.cloud.network.rules.RulesManager;
-import com.cloud.network.StorageNetworkManager;
 import com.cloud.offering.NetworkOffering;
 import com.cloud.offering.ServiceOffering;
 import com.cloud.offerings.dao.NetworkOfferingDao;
@@ -246,6 +246,9 @@
     VolumeDataStoreDao _volumeStoreDao;
     @Inject
     private ImageStoreDetailsUtil imageStoreDetailsUtil;
+    @Inject
+    private AgentMSLB agentMSLB;
+
     private long _capacityScanInterval = DEFAULT_CAPACITY_SCAN_INTERVAL;
     private int _secStorageVmMtuSize;
 
@@ -1119,7 +1122,7 @@ public boolean finalizeVirtualMachineProfile(VirtualMachineProfile profile, Depl
 
         StringBuilder buf = profile.getBootArgsBuilder();
         buf.append(" template=domP type=secstorage");
-        buf.append(" host=").append(StringUtils.shuffleCSVList(ApiServiceConfiguration.ManagementHostIPAdr.value()));
+        buf.append(" host=").append(StringUtils.toCSVList(agentMSLB.getManagementServerList(dest.getHost().getId(), dest.getDataCenter().getId())));
         buf.append(" port=").append(_mgmtPort);
         buf.append(" name=").append(profile.getVirtualMachine().getHostName());
 
diff --git a/utils/src/main/java/com/cloud/utils/StringUtils.java b/utils/src/main/java/com/cloud/utils/StringUtils.java
index 6ada2ad60bd..42dcf3c4204 100644
--- a/utils/src/main/java/com/cloud/utils/StringUtils.java
+++ b/utils/src/main/java/com/cloud/utils/StringUtils.java
@@ -21,12 +21,10 @@
 
 import java.nio.charset.Charset;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
-import java.util.Random;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -323,9 +321,7 @@ public static String mapToString(final Map<String, String> map) {
         return listOfChunks;
     }
 
-    public static String shuffleCSVList(final String csvList) {
-        List<String> list = csvTagsToList(csvList);
-        Collections.shuffle(list, new Random(System.nanoTime()));
+    public static String toCSVList(final List<String> list) {
         return join(list, ",");
     }
 }
diff --git a/utils/src/test/java/com/cloud/utils/StringUtilsTest.java b/utils/src/test/java/com/cloud/utils/StringUtilsTest.java
index e8e62b0a75e..ea5f5d10b04 100644
--- a/utils/src/test/java/com/cloud/utils/StringUtilsTest.java
+++ b/utils/src/test/java/com/cloud/utils/StringUtilsTest.java
@@ -20,13 +20,13 @@
 package com.cloud.utils;
 
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertTrue;
 
 import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.List;
 
 import org.junit.Test;
 
@@ -254,13 +254,16 @@ public void listToCsvTags() {
     }
 
     @Test
-    public void testShuffleCSVList() {
+    public void testCSVList() {
         String input = "one,two,three,four,five,six,seven,eight,nine,ten";
-        String output = StringUtils.shuffleCSVList(input);
-        assertFalse(input.equals(output));
+        List<String> list = Arrays.asList(input.split(","));
+        assertTrue(input.equals(StringUtils.toCSVList(list)));
+    }
 
-        input = "only-one";
-        output = StringUtils.shuffleCSVList("only-one");
-        assertTrue(input.equals(output));
+    @Test
+    public void testCSVListWithOneItem() {
+        String input = "singleitem";
+        List<String> list = Arrays.asList(input.split(","));
+        assertTrue(input.equals(StringUtils.toCSVList(list)));
     }
 }


 

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