Xen users - Oct 2007 - Is it possible to fence (restart) a Xen guest OS?

I am looking into creating a cluster using XEN and wanted to know if anyone
has experience doing so where all the cluster members were virtualized. In
particular is it possible to restart only the guest OS instance without
having to restart the physical machine it resides on. Any help on this would
be appreciated.

-Mike
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Hi Mike,

yes that´s one of the advantages of virtualisation, your guest system is
more or less independent from your physical machine. Yes of course if you
restart your pohysical machine your guest will also be rebooted.

You a connection between host and guest through the network bridges. Your
guest system are indepeendent because the have their own virtual harddisc
and no dierect r/w access to your host os.

What kind of cluster do you want to build?

Bye

Stefan
>
> I am looking into creating a cluster using XEN and wanted to know if
> anyone
> has experience doing so where all the cluster members were virtualized. In
> particular is it possible to restart only the guest OS instance without
> having to restart the physical machine it resides on. Any help on this
> would
> be appreciated.
>
> -Mike
> --
> View this message in context:
>
http://www.nabble.com/Is-it-possible-to-fence-%28restart%29-a-Xen-guest-OS--tf4581891.html#a13079541
> Sent from the Xen - User mailing list archive at Nabble.com.
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>

-- 

Dipl. phys. Stefan Berner
Leibniz-Rechenzentrum
Abt. Höchstleistungsrechensysteme
Boltzmannstr. 1
Garching b. München
Germany

Tel.: +49 89 35831 8752


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Thanks,

I am looking into two applications.

1. HA-Apache where I want to use Apache for serving static content as well
as using its sticky session routing to load balance between Tomcat/Jboss
instances. My goal was to be able to install Tomcat/JBOSS in a non
virtualised manner and locate Apache Httpd in a virtual cluster. The hope
was that there was a fencing module that would allow just the virtual
instances to be rebooted independent of the physical machines.

2. Also looking at HA-MySQL cluster.

We will be most likely using Red Hat Enterprise Advanced 5.0

I am new to Xen as well as Red Hat and am trying to get my hands around what
is really supported. I am also interested into what capabilities are
provided to support monitoring of application instances. Is monitoring at a
very high level (process failure) or are there more sophisticated extensions
that allow one to monitor CPU usage or user developed extension to query
health of the clustered application? Sorry for my lack of knowledge in these
areas. Trying to come up to speed as fast as possible.

-Mike



Stefan Berner-2 wrote:
> 
> Hi Mike,
> 
> yes that´s one of the advantages of virtualisation, your guest system is
> more or less independent from your physical machine. Yes of course if you
> restart your pohysical machine your guest will also be rebooted.
> 
> You a connection between host and guest through the network bridges. Your
> guest system are indepeendent because the have their own virtual harddisc
> and no dierect r/w access to your host os.
> 
> What kind of cluster do you want to build?
> 
> Bye
> 
> Stefan
>>
>> I am looking into creating a cluster using XEN and wanted to know if
>> anyone
>> has experience doing so where all the cluster members were virtualized.
>> In
>> particular is it possible to restart only the guest OS instance without
>> having to restart the physical machine it resides on. Any help on this
>> would
>> be appreciated.
>>
>> -Mike
>> --
>> View this message in context:
>>
http://www.nabble.com/Is-it-possible-to-fence-%28restart%29-a-Xen-guest-OS--tf4581891.html#a13079541
>> Sent from the Xen - User mailing list archive at Nabble.com.
>>
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@lists.xensource.com
>> http://lists.xensource.com/xen-users
>>
> 
> 
> -- 
> 
> Dipl. phys. Stefan Berner
> Leibniz-Rechenzentrum
> Abt. Höchstleistungsrechensysteme
> Boltzmannstr. 1
> Garching b. München
> Germany
> 
> Tel.: +49 89 35831 8752
> 
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
> 
> 
-- 
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mchack wrote:
> I am looking into creating a cluster using XEN and wanted to know if anyone
> has experience doing so where all the cluster members were virtualized. In
> particular is it possible to restart only the guest OS instance without
> having to restart the physical machine it resides on. Any help on this
would
> be appreciated.
> 
> -Mike
Take a look at

http://etbe.coker.com.au/2007/06/24/xen-and-heartbeat/

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Quoting mchack <mchack@cisco.com>:
> I am looking into creating a cluster using XEN and wanted to know if anyone
> has experience doing so where all the cluster members were virtualized.
The following are slightly dated but are all conceptually relevant  
even if the mechanisms must be updated to recent versions of Xen or  
your favorite dom0 or domU OS release.

See:
  http://jailtime.org/download:contrib:cluster
  http://www.clustermonkey.net/content/view/139/33/
  http://www.clustermonkey.net//content/view/161/33/

I have followed an analogous procedure on a Fedora and a Debian (Etch)  
system using MPICH1.x and torque.

-Steve Senator


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