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Re: [Linux-cluster] Info on vm definitions and options in stable3



On Thu, Mar 03, 2011 at 05:16:06PM +0100, Gianluca Cecchi wrote:
> Hello,
> in stable 3 I can have this kind of config for a KVM virtual machine
> to manage live migration:
> 
> <rm>
>    <vm .....>
> </rm>
> 
> It works ok, but I would like to know the possible parameters I can set.
> At http://sources.redhat.com/cluster/wiki/VirtualMachineBehaviors I
> can see this piece

> "..Most of the behaviors are common with normal services.."
> with a reference to start, stop, status monitoring, relocation, recovery
> 
> Where could I find a complete list?
> For example are failover domains usable inside the line?
> Or autostart option? I know how to manage autostart in a standalone
> virt-manager environment, but when in a cluster of hosts?

http://sources.redhat.com/cluster/wiki/ServiceOperationalBehaviors
http://sources.redhat.com/cluster/wiki/ServicePolicies
http://sources.redhat.com/cluster/wiki/FailoverDomains

> Or dependency lines such as
> 
> < vm name="vm1" ... >
>    <vm name="vm2" ... />
> </vm>

If you add a child of a VM, you can no longer live-migrate it.

> to power on vm2 only after power on of vm1?

you can use 'depend=' if you want, but rgmanager's handling of this sort
of dependency is rudimentary at best:

  <vm name="vm1" depend="vm:vm2" />
  <vm name="vm2" />

Will work, but if you stop vm2, vm1 will be stopped after vm2.

> About "transient domain support":
> In the stable3 implementation of rhel6 (or in general in stable 3 if
> it applies generally) a line such as this:
> 
> <vm name="myvm" use_virsh="1" xmlfile="/etc/libvirt/qemu/myvm.xml"/>
> 
> where /etc/libvirt/qemu/myvm.xm is not on a shared path, is it
> supposed that if I have myvm on node 1 and run


> clusvcadm -M vm:myvm -m node2
> 
> the file is deleted from node 1 and created in node 2 automatically or not?

You need to have the description on each host in the cluster.

-- 
Lon Hohberger - Red Hat, Inc.


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