[ClusterLabs] Pacemaker in puppet with cib.xml?
kgaillot at redhat.com
Thu Jul 21 15:40:46 EDT 2016
On 07/21/2016 02:20 PM, Stephano-Shachter, Dylan wrote:
> I am familiar with pcs cluster cib.
> What I am thinking of doing is running "pcs cluster cib --config >
> config.xml" to get a valid config.
> I will then put config.xml on the puppet server and have it push the
> file and run "pcs cluster cib-push --config config.xml" every hour.
> Will this cause any problems due to pushing the config multiple times?
No, that's fine.
> This would allow me to make small edits to the file in puppet and have
> it pushed automatically. If I wanted to make any big changes, I can make
> them with pcs and just pull another config.
> On Thu, Jul 21, 2016 at 2:52 PM, Ken Gaillot <kgaillot at redhat.com
> <mailto:kgaillot at redhat.com>> wrote:
> On 07/21/2016 01:35 PM, Stephano-Shachter, Dylan wrote:
> > Hello all,
> > I want to put the pacemaker config for my two node cluster in puppet
> > but, since it is just one cluster, it seems overkill to use the corosync
> > module. If I just have puppet push cib.xml to each machine, will that
> > work? To make changes, I would just use pcs to update things and then
> > copy cib.xml back to puppet. I am not sure what happens when you change
> > cib.xml while the cluster is running. Is it safe?
> No, pacemaker checksums the CIB and won't accept a file that isn't
> properly signed. Also, the cluster automatically synchronizes changes
> made to the CIB across all nodes, so there is no need to push changes
> more than once.
> Since you're using pcs, the update process could go like this:
> # Get the current configuration:
> pcs cluster cib --config > cib-new.xml
> # Make changes:
> pcs -f cib-new.xml <whatever-command-you-want>
> # Upload the configuration changes to the cluster:
> pcs cluster cib-push --config cib-new.xml
> Using "--config" is important so you only work with the configuration
> section of the CIB, and not the dynamically determined cluster
> properties and status.
> The first and last commands can be done on any one node, with the
> cluster running. The "pcs -f" commands can be done anywhere/anytime.
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