[fedora-virt] KVM high available

[iarly selbir]

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)

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>wrote:

> On Fri, 14 Jan 2011 14:19:52 -0300, iarly selbir <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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