[Linux-cluster] rgmanager vm.sh using virsh under RHEL5.4

Alain RICHARD alain.richard at equation.fr
Mon Nov 2 15:44:26 UTC 2009

I have had a look at the current vm.sh script and have found out :

a) use_virsh = 1 per default
b) that if your resource have a path attribute, vm.sh automatically  
revert to use_virsh=0, even if you hard code use_virsh=1 !
c) there is no option to indicate the xml file that virsh use to  
create the vm. It always tries "virsh create name" where name is the  
vm name.

The point a) is a little bit silly because if you have a RHEL 5.3  
cluster that is using xm configuration files, your vm will no longer  
launch after upgrade because it tries to do a "virsh create name"  
instead of "xm create name". It would have been probably cleaner to  
have "use_virsh = 0" per default to keep compatibility.

The point b) will add compatibility to people that use the path  
attribute in order to store vm conf files in a place shared by all  
members of the cluster (gfs2 or nfs directory for example). It would  
have been clearer to document this feature because it is a little bit  
magical to see a resource with use_virsh=1 use in fact xm and not  
virsh !!!

The point c) is very silly, because it restricts the configuration to  
be loaded from /etc/xen even for kvm ! Also this directory is not  
shared on the various members of the cluster and the configuration  
file must have the same name as the vm name (we prefer to call it  

Also their is no problem to use a "virsh create /path/to/file.xml"  
under RHEL 5.4 and I have found out that the cluster 3.0 stable branch  
have a new vm.sh file using an xmlpath attribute to solve this  
problem. Why this version was not back ported to RHEL 5.4 ? Is there  
any plan to do it ?


Alain RICHARD <mailto:alain.richard at equation.fr>
EQUATION SA <http://www.equation.fr/>
Tel : +33 477 79 48 00     Fax : +33 477 79 48 01
E-Liance, Opérateur des entreprises et collectivités,
Liaisons Fibre optique, SDSL et ADSL <http://www.e-liance.fr>

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