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From Wido den Hollander <w...@widodh.nl>
Subject Re: KVM host agent disconnection
Date Sat, 06 Feb 2016 07:48:02 GMT
Hi,

> Op 5 februari 2016 om 17:24 schreef Indra Pramana <indra@sg.or.id>:
> 
> 
> Dear all,
> 
> We are using CloudStack 4.2.0, KVM hypervisor and Ceph RBD for primary
> storage. In the past one week, many of our KVM host agents would often be
> disconnected from the management server, causing the VMs to go down because
> of HA work. While we used to have host disconnection in the past, normally
> it would only affect just one host, but this time round, when the problem
> happens, it would happen on multiple hosts, up to 4-5 hosts at the same
> time.
> 

Any reason to still run 4.2? I've seen this happen as well and I haven't seen
this with recent versions of ACS.

Could you maybe upgrade to 4.8?

Wido

> Nothing much I can find on both the management-server.log and agent.log,
> with no significant warn, error or exceptions logged before the
> disconnection. Here are the sample logs from the agent:
> 
> ===
> 2016-02-05 03:20:28,820 ERROR [cloud.agent.Agent] (UgentTask-7:null) Ping
> Interval has gone past 300000.  Attempting to reconnect.
> 2016-02-05 03:20:28,825 DEBUG [cloud.agent.Agent] (UgentTask-7:null)
> Clearing watch list: 2
> 2016-02-05 03:20:28,825 DEBUG [utils.nio.NioConnection]
> (Agent-Selector:null) Closing socket
> Socket[addr=/*.*.3.3,port=8250,localport=50489]
> 2016-02-05 03:20:33,825 INFO  [cloud.agent.Agent] (UgentTask-7:null) Lost
> connection to the server. Dealing with the remaining commands...
> 2016-02-05 03:20:38,826 INFO  [cloud.agent.Agent] (UgentTask-7:null)
> Reconnecting...
> 2016-02-05 03:20:38,829 INFO  [utils.nio.NioClient] (Agent-Selector:null)
> Connecting to *.*.3.3:8250
> 2016-02-05 03:20:38,925 INFO  [utils.nio.NioClient] (Agent-Selector:null)
> SSL: Handshake done
> 2016-02-05 03:20:38,926 INFO  [utils.nio.NioClient] (Agent-Selector:null)
> Connected to *.*.3.3:8250
> 2016-02-05 03:20:43,926 INFO  [cloud.agent.Agent] (UgentTask-7:null)
> Connected to the server
> ===
> 
> Sometimes, the Cloudstack agent will not be able to re-connect unless if we
> stop and start the agent again manually:
> 
> ===
> 2016-02-05 03:22:20,330 ERROR [cloud.agent.Agent] (UgentTask-6:null) Ping
> Interval has gone past 300000.  Attempting to reconnect.
> 2016-02-05 03:22:20,331 DEBUG [cloud.agent.Agent] (UgentTask-6:null)
> Clearing watch list: 2
> 2016-02-05 03:22:20,353 DEBUG [utils.nio.NioConnection]
> (Agent-Selector:null) Closing socket
> Socket[addr=/*.*.3.3,port=8250,localport=46231]
> 2016-02-05 03:22:25,332 INFO  [cloud.agent.Agent] (UgentTask-6:null) Lost
> connection to the server. Dealing with the remaining commands...
> 2016-02-05 03:22:25,332 INFO  [cloud.agent.Agent] (UgentTask-6:null) Cannot
> connect because we still have 3 commands in progress.
> 2016-02-05 03:22:30,333 INFO  [cloud.agent.Agent] (UgentTask-6:null) Lost
> connection to the server. Dealing with the remaining commands...
> 2016-02-05 03:22:30,333 INFO  [cloud.agent.Agent] (UgentTask-6:null) Cannot
> connect because we still have 3 commands in progress.
> 2016-02-05 03:22:35,333 INFO  [cloud.agent.Agent] (UgentTask-6:null) Lost
> connection to the server. Dealing with the remaining commands...
> 2016-02-05 03:22:35,334 INFO  [cloud.agent.Agent] (UgentTask-6:null) Cannot
> connect because we still have 3 commands in progress.
> 2016-02-05 03:22:40,334 INFO  [cloud.agent.Agent] (UgentTask-6:null) Lost
> connection to the server. Dealing with the remaining commands...
> 2016-02-05 03:22:40,335 INFO  [cloud.agent.Agent] (UgentTask-6:null) Cannot
> connect because we still have 3 commands in progress.
> 2016-02-05 03:22:45,335 INFO  [cloud.agent.Agent] (UgentTask-6:null) Lost
> connection to the server. Dealing with the remaining commands...
> 2016-02-05 03:22:45,335 INFO  [cloud.agent.Agent] (UgentTask-6:null) Cannot
> connect because we still have 3 commands in progress.
> 2016-02-05 03:22:50,336 INFO  [cloud.agent.Agent] (UgentTask-6:null) Lost
> connection to the server. Dealing with the remaining commands...
> 2016-02-05 03:22:50,336 INFO  [cloud.agent.Agent] (UgentTask-6:null) Cannot
> connect because we still have 3 commands in progress.
> 2016-02-05 03:22:55,337 INFO  [cloud.agent.Agent] (UgentTask-6:null) Lost
> connection to the server. Dealing with the remaining commands...
> 2016-02-05 03:22:55,337 INFO  [cloud.agent.Agent] (UgentTask-6:null) Cannot
> connect because we still have 3 commands in progress.
> 2016-02-05 03:23:00,338 INFO  [cloud.agent.Agent] (UgentTask-6:null) Lost
> connection to the server. Dealing with the remaining commands...
> 2016-02-05 03:23:00,339 INFO  [cloud.agent.Agent] (UgentTask-6:null) Cannot
> connect because we still have 3 commands in progress.
> 2016-02-05 03:23:05,339 INFO  [cloud.agent.Agent] (UgentTask-6:null) Lost
> connection to the server. Dealing with the remaining commands...
> 2016-02-05 03:23:05,340 INFO  [cloud.agent.Agent] (UgentTask-6:null) Cannot
> connect because we still have 3 commands in progress.
> 2016-02-05 03:23:10,340 INFO  [cloud.agent.Agent] (UgentTask-6:null) Lost
> connection to the server. Dealing with the remaining commands...
> 2016-02-05 03:23:10,340 INFO  [cloud.agent.Agent] (UgentTask-6:null) Cannot
> connect because we still have 3 commands in progress.
> 2016-02-05 03:23:15,341 INFO  [cloud.agent.Agent] (UgentTask-6:null) Lost
> connection to the server. Dealing with the remaining commands...
> 2016-02-05 03:23:15,341 INFO  [cloud.agent.Agent] (UgentTask-6:null) Cannot
> connect because we still have 3 commands in progress.
> 2016-02-05 03:23:16,945 INFO  [cloud.agent.Agent]
> (AgentShutdownThread:null) Stopping the agent: Reason = sig.kill
> 2016-02-05 03:23:16,946 DEBUG [cloud.agent.Agent]
> (AgentShutdownThread:null) Sending shutdown to management server
> 2016-02-05 03:23:17,949 INFO  [cloud.agent.Agent] (UgentTask-6:null) Lost
> connection to the server. Dealing with the remaining commands...
> 2016-02-05 03:23:17,949 INFO  [cloud.agent.Agent] (UgentTask-6:null) Cannot
> connect because we still have 3 commands in progress.
> ===
> 
> During the time when the problem happens, I can confirm that the CPU and
> memory load on the server is healthy and not overloaded. I understand that
> such problem can happen when the hypervisor host is overloaded, however
> this is not the case -- especially since when such problem happens now, it
> will strike up to 4-5 hypervisor hosts at the same time.
> 
> On the management server, here are the typical logs:
> 
> ===
> 2016-02-05 03:20:28,828 INFO  [agent.manager.AgentManagerImpl]
> (AgentTaskPool-10:null) Investigating why host 72 has disconnected with
> event AgentDisconnected
> 2016-02-05 03:20:28,828 DEBUG [agent.manager.AgentManagerImpl]
> (AgentTaskPool-10:null) checking if agent (72) is alive
> 2016-02-05 03:20:28,833 DEBUG [agent.transport.Request]
> (AgentTaskPool-10:null) Seq 72-215557373: Sending  { Cmd , MgmtId:
> 161342671900, via: 72, Ver: v1, Flags: 100011
> , [{"com.cloud.agent.api.CheckHealthCommand":{"wait":50}}] }
> 2016-02-05 03:20:28,833 INFO  [agent.manager.AgentAttache]
> (AgentTaskPool-10:null) Seq 72-215557373: Unable to send due to Resource
> [Host:72] is unreachable: Host 72: C
> hannel is closed
> 2016-02-05 03:20:28,833 DEBUG [agent.manager.AgentAttache]
> (AgentTaskPool-10:null) Seq 72-215557373: Cancelling.
> 2016-02-05 03:20:28,833 WARN  [agent.manager.AgentManagerImpl]
> (AgentTaskPool-10:null) Resource [Host:72] is unreachable: Host 72: Channel
> is closed
> 2016-02-05 03:20:28,836 DEBUG [cloud.ha.HighAvailabilityManagerImpl]
> (AgentTaskPool-10:null) SimpleInvestigator unable to determine the state of
> the host.  Moving on.
> 2016-02-05 03:20:28,836 DEBUG [cloud.ha.HighAvailabilityManagerImpl]
> (AgentTaskPool-10:null) XenServerInvestigator unable to determine the state
> of the host.  Moving on
> .
> 2016-02-05 03:20:28,836 DEBUG [cloud.ha.UserVmDomRInvestigator]
> (AgentTaskPool-10:null) checking if agent (72) is alive
> 2016-02-05 03:20:28,840 DEBUG [cloud.ha.UserVmDomRInvestigator]
> (AgentTaskPool-10:null) sending ping from (34) to agent's host ip address
> (*.*.3.25)
> 2016-02-05 03:20:28,843 DEBUG [agent.transport.Request]
> (AgentTaskPool-10:null) Seq 34-815540048: Sending  { Cmd , MgmtId:
> 161342671900, via: 34, Ver: v1, Flags: 100011
> ,
> [{"com.cloud.agent.api.PingTestCommand":{"_computingHostIp":"*.*.3.25","wait":20}}]
> }
> 2016-02-05 03:20:29,024 DEBUG [agent.transport.Request]
> (AgentManager-Handler-14:null) Seq 34-815540048: Processing:  { Ans: ,
> MgmtId: 161342671900, via: 34, Ver: v1, F
> lags: 10, [{"com.cloud.agent.api.Answer":{"result":true,"wait":0}}] }
> 2016-02-05 03:20:29,024 DEBUG [agent.transport.Request]
> (AgentTaskPool-10:null) Seq 34-815540048: Received:  { Ans: , MgmtId:
> 161342671900, via: 34, Ver: v1, Flags: 10,
>  { Answer } }
> 2016-02-05 03:20:29,024 DEBUG [cloud.ha.AbstractInvestigatorImpl]
> (AgentTaskPool-10:null) host (*.*.3.25) has been successfully pinged,
> returning that host is up
> 2016-02-05 03:20:29,024 DEBUG [cloud.ha.UserVmDomRInvestigator]
> (AgentTaskPool-10:null) ping from (34) to agent's host ip address
> (*.*.3.25) successful, returning th
> at agent is disconnected
> 2016-02-05 03:20:29,024 DEBUG [cloud.ha.HighAvailabilityManagerImpl]
> (AgentTaskPool-10:null) null was able to determine host 72 is in
> Disconnected
> 2016-02-05 03:20:29,024 INFO  [agent.manager.AgentManagerImpl]
> (AgentTaskPool-10:null) The state determined is Disconnected
> 2016-02-05 03:20:29,024 WARN  [agent.manager.AgentManagerImpl]
> (AgentTaskPool-10:null) Agent is disconnected but the host is still up:
> 72-**-kvm-05
> 2016-02-05 03:20:29,025 WARN  [apache.cloudstack.alerts]
> (AgentTaskPool-10:null)  alertType:: 7 // dataCenterId:: 6 // podId:: 6 //
> clusterId:: null // message:: Host disconnected, name: **-kvm-05 (id:72),
> availability zone: *****-******-01, pod: *****-******-Pod-01
> 2016-02-05 03:20:29,086 INFO  [agent.manager.AgentManagerImpl]
> (AgentTaskPool-10:null) Host 72 is disconnecting with event
> AgentDisconnected
> 2016-02-05 03:20:29,089 DEBUG [agent.manager.AgentManagerImpl]
> (AgentTaskPool-10:null) The next status of agent 72is Alert, current status
> is Up
> 2016-02-05 03:20:29,089 DEBUG [agent.manager.AgentManagerImpl]
> (AgentTaskPool-10:null) Deregistering link for 72 with state Alert
> 2016-02-05 03:20:29,089 DEBUG [agent.manager.AgentManagerImpl]
> (AgentTaskPool-10:null) Remove Agent : 72
> 2016-02-05 03:20:29,089 DEBUG [agent.manager.ConnectedAgentAttache]
> (AgentTaskPool-10:null) Processing Disconnect.
> 2016-02-05 03:20:29,089 DEBUG [agent.manager.AgentAttache]
> (AgentTaskPool-10:null) Seq 72-215547906: Sending disconnect to class
> com.cloud.network.security.SecurityGroupListener
> 2016-02-05 03:20:29,089 DEBUG [agent.manager.AgentManagerImpl]
> (AgentTaskPool-10:null) Sending Disconnect to listener:
> com.cloud.hypervisor.xen.discoverer.XcpServerDiscoverer_EnhancerByCloudStack_8f0e0536
> 2016-02-05 03:20:29,089 DEBUG [agent.manager.AgentManagerImpl]
> (AgentTaskPool-10:null) Sending Disconnect to listener:
> com.cloud.deploy.DeploymentPlanningManagerImpl_EnhancerByCloudStack_55d28fac
> 2016-02-05 03:20:29,089 DEBUG [agent.manager.AgentManagerImpl]
> (AgentTaskPool-10:null) Sending Disconnect to listener:
> com.cloud.network.NetworkManagerImpl_EnhancerByCloudStack_6763a13f
> 2016-02-05 03:20:29,089 DEBUG [agent.manager.AgentManagerImpl]
> (AgentTaskPool-10:null) Sending Disconnect to listener:
> com.cloud.storage.secondary.SecondaryStorageListener
> ===
> 
> Can anyone advise how can I start troubleshooting to find the root cause of
> the problem? So that I can take whatever measures to prevent similar
> problem from happening.
> 
> Any advice is greatly appreciated.
> 
> Looking forward to your reply, thank you.
> 
> Cheers.
> 
> -ip-

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