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https://issues.apache.org/jira/browse/CLOUDSTACK-3954?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Abhinandan Prateek updated CLOUDSTACK-3954:
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Assignee: Murali Reddy
> 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: Murali Reddy
> Priority: Critical
>
> 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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