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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-10310) KVM hosts reboot if there is a short transient storage error
Date Sun, 04 Mar 2018 13:11:00 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-10310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16385113#comment-16385113
] 

ASF GitHub Bot commented on CLOUDSTACK-10310:
---------------------------------------------

rhtyd commented on a change in pull request #2472: CLOUDSTACK-10310 Fix KVM reboot on storage
issue
URL: https://github.com/apache/cloudstack/pull/2472#discussion_r172048283
 
 

 ##########
 File path: scripts/vm/hypervisor/kvm/kvmheartbeat.sh
 ##########
 @@ -155,10 +155,10 @@ then
   exit 0
 elif [ "$cflag" == "1" ]
 then
-  /usr/bin/logger -t heartbeat "kvmheartbeat.sh rebooted system because it was unable to
write the heartbeat to the storage."
+  /usr/bin/logger -t heartbeat "kvmheartbeat.sh stopped cloudstack-agent because it was unable
to write the heartbeat to the storage."
   sync &
   sleep 5
-  echo b > /proc/sysrq-trigger
+  service cloudstack-agent stop
 
 Review comment:
   Good idea @rafaelweingartner, perhaps a cluster scope global parameter. However, such a
setting need to be propagated when agent/client connects to mgmt server (say via ReadyCommand)
or overridable in agent.properties file.

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> KVM hosts reboot if there is a short transient storage error
> ------------------------------------------------------------
>
>                 Key: CLOUDSTACK-10310
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10310
>             Project: CloudStack
>          Issue Type: Improvement
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: KVM
>    Affects Versions: 4.9.0, 4.10.0.0
>            Reporter: Sean Lair
>            Priority: Major
>
> If the KVM heartbeat file can't be written to, the host is rebooted, and thus taking
down all VMs running on it.  The code does try 5x times before the reboot, but the there
is not a delay between the retires, so they are 5 simultaneous retries, which doesn't help. 
Standard SAN storage HA operations or quick network blip could cause this reboot to occur.
> Some discussions on the dev mailing list revealed that some people are just commenting
out the reboot line in their version of the CloudStack source.
> A better option (and a new PR is being issued) would be have it sleep between tries so
it isn't 5x almost simultaneous tries.  Plus, instead of rebooting, the cloudstack-agent
could just be stopped on the host instead.  This will cause alerts to be issued and if the
host is disconnected long-enough, depending on the HA code in use, VM HA could handle the
host failure.
> The built-in reboot of the host seemed drastic



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