[fedora-virt] KVM high available

[Dor Laor]

On 01/14/2011 08:34 PM, iarly selbir wrote:
> Sorry, I forgot to mentions it, Yes I have this configuration two
> failover domain, first with host-1 on top, and other with host-2 on top.
>
> My question is, how you guys are configuring your guests resources to
> failover from on hosts to another, remembering that I have same machines
> on two kvm hosts, i.e. kvm001 has guest001 on, and kvmsrv002 has
> guest001 ( It must be powered on just in fail of guest0001 on kvm001)

Using hearbeat/light cluster mgmt ala Linux HA package might be a good 
option for you.

>
> I hope being clear enough.
>
> Thank you so much.
>
> - -
> iarlyy selbir
>
> :wq!
>
>
>
> On Fri, Jan 14, 2011 at 3:18 PM, Thomas Sjolshagen
> <thomas at sjolshagen.net <mailto:thomas at sjolshagen.net>> wrote:
>
>     On Fri, 14 Jan 2011 14:19:52 -0300, iarly selbir <iarlyy at gmail.com
>     <mailto:iarlyy at gmail.com>> wrote:
>
>>     Hi there,
>>     Hi I'm joining today an would like to share my knowledge with
>>     virtualization and get more = )
>>     when KVM-HOST-001 fail, the KVM-HOST-002 take over all machines
>>     from other host, I'm sharing a storage volume between two nodes
>>     (gfs2), so all hosts can see the guest images, but how to
>>     configure the clusters resources to migrate the guests? this is my
>>     question and any suggestions will be appreciated.
>     Assuming you're using libvirt to manage the VM's (guests), I'd
>     configure them as <vm> resources in rgmanager and make them members
>     of a failover group with the highest (shows up as the lowest
>     priority number in the example) priority to the KVM-HOST-* you want
>     the guest to start on (if it's available).
>     A couple of (example) <vm> resource I have configured in my 2-node
>     GFS2 based KVM cluster (some of the info in the vm resource tag is
>     actually not necessary, but I was both experimenting and playing it
>     safe when I set this up)
>     <rm>
>     <failoverdomains>
>     <failoverdomain name="prefer-virt0" restricted="0" ordered="1">
>     <failoverdomainnode name="virt0-backup" priority="10" />
>     <failoverdomainnode name="virt1-backup" priority="20" />
>     </failoverdomain>
>     <failoverdomain name="prefer-virt1" restricted="0" ordered="1">
>     <failoverdomainnode name="virt1-backup" priority="10" />
>     <failoverdomainnode name="virt0-backup" priority="20" />
>     </failoverdomain>
>     </failoverdomains>
>     <!-- VM resources -->
>     <vm name="imap1" autostart="1" recovery="restart" migrate="live"
>     domain="prefer-virt0" use_virsh="1" hypervisor="qemu" />
>     <vm name="imap2" autostart="1" recovery="restart" migrate="live"
>     domain="prefer-virt1" use_virsh="1" hypervisor="qemu" />
>     </rm>
>     Hope this helps to illustrate.
>     // Thomas
>
>
>
>
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