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From "Marcus Sorensen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-600) When rebooting KVM local storage VM host, libvirt definitions deleted
Date Thu, 03 Jan 2013 06:42:12 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13542747#comment-13542747
] 

Marcus Sorensen commented on CLOUDSTACK-600:
--------------------------------------------

Are you sure this isn't just a misunderstanding in how cloudstack works? Nothing regarding
a VM host's libvirt information should be persistent. When a storage pool is needed, cloudstack
defines it. When a VM needs to be started, cloudstack creates the XML definition on the fly
and feeds it to libvirt. So when a KVM host reboots and the network isn't accessible, or you
say no VMs exist, it's no surprise to me, as the management server has to tell the agent which
VMs exist and when to start them.
                
> When rebooting KVM local storage VM host, libvirt definitions deleted
> ---------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-600
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-600
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: KVM
>    Affects Versions: pre-4.0.0
>            Reporter: Andrew Bayer
>
> This is definitely the case in 3.0.3, and I don't think the relevant code has been touched
since.
> When you reboot a VM host running KVM local storage VMs, the VMs are deleted from libvirt.
I presume this is due to CloudStack thinking it's migrating them away from the host, but obviously,
given that we're on local storage, it's unable to do that. The result is that the VMs are
not able to be restarted when the host comes back online.

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