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https://issues.apache.org/jira/browse/CLOUDSTACK-3954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13729359#comment-13729359
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Koushik Das commented on CLOUDSTACK-3954:
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Lennert,
Can you share the logs for the scenario mentioned? There is another issue
CLOUDSTACK-3535 which says that for KVM hosts HA doesn't work. And this issue
says that HA is happening when the host is pingable but the agent is not
running on the host. The logs will help in understanding the scenario better.
> HA with Security Groups and ping disabled will cause split-brian
> ----------------------------------------------------------------
>
> Key: CLOUDSTACK-3954
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-3954
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: KVM
> Affects Versions: 4.1.0
> Environment: Tested this with CS 4.1 on Ubuntu, but will probably
> exist in other versions
> Reporter: Lennert den Teuling
> Assignee: Koushik Das
> Priority: Critical
> Fix For: 4.2.0
>
>
> We found out that when running CS 4.1 on KVM with Security Groups enabled +
> ping disabled (default) will cause a split-brain when agent crashes.
> How to reproduce:
> 1. Setup a Basic Zone with SG enabled
> 2. Create one or multiple HA-enabled VMs with a security group which does
> not allow ping (by default).
> 3. Kill the agent on one of the hosts
> When you do this, the HA component on the management server will restart all
> VMs on another node, even when they are running and the VM host is still
> pingable. This will likely corrupt all VMs on the host where the agent was
> stopped/killed.
> We had some issues with libvirt causing the agent to disconnect. Luckily some
> VMs allowed ping so nothing bad happened.
> Temporary fix:
> Ensure at least one of the running VMs on each hosts allows ping, so the HA
> manager will be able to ping it and will not HA the host.
> I'm not sure yet why this happens, but wanted to file this bug so people can
> take necessary preparations.
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