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Re: [Linux-cluster] RFC: updating cluster.conf



Thanks for asking :-)

1. Daily -- or multiple times daily in our Xen VM clusters.  I have the config_version property though, I'd like to see that gotten rid of so I don't have to worry about going over the limit.

2. Generally it's adding/changing services.  Adding of nodes/fencing settings happens, but much, much less frequently

3/4.  I wrote a python script to update the XML automagically, then use ccs_tool to propagate the update.  It would be nice to have an API interface for changing the cluster config from custom tools (like shell scripts or web interfaces) if that's possible.  Though I should say that the python script I wrote was pretty stupid as easy, I'm just concerned about cluster.conf format changes and how that will affect my tools.

5. I would not like to use LDAP.  My experience in general with OpenLDAP is poor and it seems poorly documented.  Moreover, it implements a single-point of failure for the cluster configuration.  I like having hte cluster configuration stored on each node.

On Mon, Jun 23, 2008 at 9:16 AM, David Teigland <teigland redhat com> wrote:
Hi,

We're looking into how cluster.conf updates should be done in future
versions and we'd like some feedback about how you currently do this, and
what you'd like to see.

1. How often do you update cluster.conf?  ("Never" would be valuable
  feedback.)

2. What changes do you make?  e.g. add nodes, change fencing settings,
  add or change rgmanager settings.

3. How do you currently update cluster.conf?  Cluster online or offline?
  Manually scp to all nodes?  ccs_tool?  conga?  What do you like and not
  like about the method you use now?

4. How would you like to do updates to cluster.conf in the future?
  Conga (graphical management interface)?  Command line program that
  updates /etc/cluster/cluster.conf on all cluster nodes?
  Manually scp to all nodes?  Other?

5. Would you like to use an LDAP server?  All cluster nodes would read
  cluster.conf info from the server; updates would just be made on
  the server.

Thanks,
Dave

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