Hi,
I am running RHEL Virtual Machines as cluster services on RedHat 5.2
Dom0 nodes. The virtual machines use clustered logical volumes for
storage, /etc/xen is located on a gfs filesystem. Cluster management
using luci from a dedicated admin server. (The entire system works quite
well. Some load balancing mechanism on the Dom0 nodes would be fine, but
that is another issue...)
Now I need a second cluster, in fact I need a gfs filesystem shared
among some of the virtual machines. In general this should not be an
issue, but how can I fence a virtual machine inside of a virtual
cluster? Technically 'virsh destroy' on the Dom0 host will do the job.
Though:
a) I cannot define a script for fencing (at least using luci).
b) There is a fencing method for virtual machines in the RHEL 5.2
cluster, but it is only meant to fence virtual nodes that are part of a
mixed cluster of physical and virtual nodes.
c) Inside a virtual cluster the "Virtual Machine Fencing" is of no use,
because the virtual machine itself is a service in *another* cluster.
One would need an option to define the Dom0 host or cluster.
I somehow object to mix physical with virtual machines inside of a
cluster (and I do not want to take virtual machines part in the quorum
of the physical machines. Hypothetically the virtual machines may fence
the physical nodes, thereby shutting down the entire cluster...) . The
Dom0-cluster is intended to run VMs only and no other services. The VMs
are to provide services, and if they need cluster services, I prefer to
define aditional clusters.
Am I missing something? In fact the ability to define a script for
fencing would be sufficient from my point of view.
Or is the only real solution to join the VMs in the Dom0 cluster and
assign a dedicated failover group to them?
any hint is highly appreciated.
best regards, Gunther
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