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Old 12-31-2007, 07:14 AM   #1
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Registered: Dec 2004
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Question Wrapping my head around Xen/RHCS Clustering (CentOS 5)

I posted this over at the CentOS forums, but I've had good luck with the fine folks here at LQ so I figured I'd ask here, too...

Maybe you guys can shed a bit of light on this because I have been doing tons of research and have yet to come to a simple conclusion. What I want to do is quite simple: Run a cluster of Xen-enabled CentOS 5 boxes. I need to support live migration, but beyond that I don't need anything extreme between the boxes themselves such as shared storage, etc. From what I understand right now, this is how I think it would go, assuming CentOS 5 is installed on two boxes:
  1. Get both boxes booting the Xen kernel
  2. Configure each box for proper use with RHCS (still haven't found a straight-forward tutorial for this; the official documentation is ridiculously verbose)
  3. Create DomU's on servers

Am I on the right track somewhat? The biggest issue I'm having is "Xen Clustering" generally refers to clustering VMs on a single box, for instance to be used in parallel computing tasks. On the flip side, I can find information on RHCS by itself, but no information on how they can easily work together, i.e. node migration between Dom0's. If anyone can shed some light on this, or just point in the direction of documentation that makes sense in this context, I would greatly appreciate it.

Old 12-31-2007, 10:12 AM   #2
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Registered: Dec 2004
Posts: 28

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Okay, I'd like to amend this a bit as I think it's making a little more sense... let me know!

(CentOS 5 is installed on two machines)...
  1. Boot Xen on each box
  2. Ensure /etc/hosts has node info for srv1 and srv2
  3. Setup luci/ricci
  4. I want to use GFS, so load GFS onto each box
  5. Use CLVM to create initial volumes
  6. Setup Cluster using Conga, including GFS volumes
  7. Enable live migration for Xen (still fleshing this)
And this is where I'm stuck for the moment. Do I just create VMs as normal? I'm going to assume it will work fine with the GFS volumes. And I'm reading something in the RedHat manual, where they go over an example of installing Apache, that it has to be installed on every node. I assume that doesn't apply to Xen VMs?

This is still a bit cloudy...


centos5, rhcs, xen

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