On May 19, 2008, at 9:07 AM, Nitin wrote:
On Mon, 2008-05-19 at 08:34 +0200, Andrew Beekhof wrote:
On May 19, 2008, at 7:14 AM, Nitin wrote:
On Fri, 2008-05-16 at 15:08 +0200, Andrew Beekhof wrote:
On May 16, 2008, at 3:04 PM, Nitin wrote:
Hello,
I would like to make my virtual machines (DomUs) resources to
participate in the HA cluster. Dom0 (Physical Host) may or may not
have
resources.
To do this I would like to treat DomUs as *resource* in the
cluster as
opposed to treating them as *nodes*. I am planning to write OCF
resource
agents for virtual machines. But I am not very sure about how to
make a
resource's resource to participate in the cluster.
Is there any configuration in existing structure to achieve this??
If no
then please tell me how to go about creating a "container"
resource in
CRM.
Why not just use the Xen agent if you don't want them to be cluster
nodes?
Or do you mean that you want them to both be resources and to run
other resources too?
Yes. Please advise me how to go about it.
Thanks a lot for reply.
We don't have a clean way to do that yet
Possible options:
a) start the services at VM boot (you don't get monitoring)
b) start the services at VM boot and modify the Xen agent to monitor
the services inside the VM (ugly)
c) add a proxy resource to start/stop/monitor the services inside the
VM (complex)
Did you mean writing a OCF RA which will take care of start/stop/
monitor inside VMs ??
right
Can we configure how CRM will handle resource failures in this case??
as far as the crm knows, its just another resource
For example if res1 at VM1 fails
retry on same VM
success --> OK
failure --> start res1 (with group dependencies/collocation
preferences) at VM2 on same node
no - the cluster doesn't know that VM1 or VM2 is a cluster node.
so (for option 'c') the cluster will never allocate the resource to a
specific virtual machine - thats up to you.
(success -- OK)
failure --> start res1 as direct resource to node
..........
..........
finally use Passive node's VM
d) implement a generic version of c)
I guess it would be required otherwise we have to write a proxy
resource
(c) for each resource type. Right??
depends on what your needs are
e) have the VM join the cluster (makes stonith and quorum
"interesting")
f) wait for us to implement clusters-of-clusters which also solves
this scenario "for free"
g) something else i've not thought of
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