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

On Mon, 23 Jun 2008, David Teigland wrote:


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

Production: rarely if nodes are behaving properly and no switch to other nodes is required

as developer, you know better than me.. virtually every 5 minutes :)

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

Production: switch nodes, add/modify services.

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?

Production: manually edit cluster.conf, ccs_tool to propagate across the nodes. I like it because i can do the changes in one place and they are propagated all over the cluster in one command.

as developer, i don't have a standard way of doing it. I often use scp wrapper scripts since the configuration changes are done offline and involves several nodes to be powered off or not available.

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?

For production I generally like the idea of changes in one place and then automatic propagation and this generally fits also #5

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.

Yes. the main idea is to fire up a node without having to worry about a local copy of a file and get all the info down the pipe.

_theoretically_ even a wget http://foo.bar.com/cluster.conf would do.


I'm going to make him an offer he can't refuse.

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