[Linux-cluster] updating running cluster.conf

[chekov at ucla.edu]

thanks David,

sending a HUP to ccsd was the step I was missing.  once I remmembered all 
of my closing slashes and spelled passwd correctly everything worked fine 
:-)
-alan

On Fri, 29 Oct 2004, David Teigland wrote:

> On Thu, Oct 28, 2004 at 01:50:12PM -0700, chekov at ucla.edu wrote:
>> I've been running a two-node cluster for a month or so and finally got
>> myself a couple of APC master switches to perform automatic fencing.
>> I want to update my cluster.conf file to reflect the new fencing method but
>> I'd like to do it without an interruption in service.
>> When I join a node the cluster simply copies over the old cluster.conf file
>> to the new nodes /etc/cluster directory.  So simply joining a new node with
>> a new config file doesn't do it.
>> I tried using "cman_tool version -r" in an attempt to update the conf
>> version.  However now it just rejects node addition in general (and does
>> not update the running cluster.conf file)...
>>
>> in short, I don't know how to introduce the new changes without taking down
>> all nodes.  any ideas?
>
> 1. have both nodes running as cluster members using the original
>   cluster.conf
>
> 2. on one node, update /etc/cluster/cluster.conf, incrementing
>   config_version
>
> 3. on this same node run "killall -HUP ccsd"
>
> 4. verify that the new cluster.conf exists on both nodes
>
> 5. on this same node run "cman_tool -r <new config_version>"
>
> 6. check /proc/cluster/status to verify the new config version
>
> I just tried this and it works with the current code in cvs.  If it fails
> for you you may need to update (which probably requires upgrading both
> nodes together making it a moot point.)
>
>