[Pacemaker] Change Hostname

[Dejan Muhamedagic]

On Thu, Sep 06, 2012 at 02:06:19PM +0300, Dan Frincu wrote:
> Hi,
> 
> On Thu, Sep 6, 2012 at 1:58 PM, Dan Frincu <df.cluster at gmail.com> wrote:
> > Hi,
> >
> > On Thu, Sep 6, 2012 at 1:35 PM, Thorsten Rehm <thorsten.rehm at gmail.com> wrote:
> >> Hi everyone,
> >>
> >> nobody has an idea?
> >> Have I missed something in the documentation?
> >
> > Put the cluster in maintenance-mode.
> > Stop Pacemaker, stop Corosync.
> > Change the hostname.
> > Check if the change actually worked.
> > Start Corosync, start Pacemaker.
> > Perform a reprobe and refresh from crm. Remove maintenance-mode.
> > Delete old node names from cluster configuration (crm node delete
> > $old-hostname).
> 
> My bad, you're running on Heartbeat.

The procedure should be basically the same. Though with
heartbeat, there are local files (hostcache and hb_uuid) in
/var/lib/heartbeat which need to be updated. There is a
procedure documented on how to replace a node which was gone for
good (in Pacemaker explained).

Thanks,

Dejan

> > Dance.
> >
> > HTH,
> > Dan
> >
> >>
> >> Regards,
> >> Thorsten
> >>
> >>
> >> On Tue, Sep 4, 2012 at 10:55 AM, Thorsten Rehm <thorsten.rehm at gmail.com> wrote:
> >>> Hi,
> >>>
> >>> ohh, thanks, but I have heartbeat in use.
> >>> "Legacy cluster stack based on heartbeat"
> >>> http://www.clusterlabs.org/wiki/File:Stack-lha.png
> >>>
> >>> So, there is no corosync.conf ;)
> >>>
> >>> Regards,
> >>> Thorsten
> >>>
> >>> On Tue, Sep 4, 2012 at 10:38 AM, Vit Pelcak <vpelcak at suse.cz> wrote:
> >>>> -----BEGIN PGP SIGNED MESSAGE-----
> >>>> Hash: SHA1
> >>>>
> >>>> Dne 4.9.2012 10:28, Thorsten Rehm napsal(a):
> >>>>> Hi everyone,
> >>>>>
> >>>>> I have a cluster with three nodes (stack: heartbeat) and I need to
> >>>>> change the hostname of all systems (only the hostname, not the ip
> >>>>> address or other network configuration). I have already made
> >>>>> several attempts, but so far I have not managed that resources are
> >>>>> available without interruption, after I changed the hostname. Is
> >>>>> there a procedure that allows me to change the hostname, without
> >>>>> loss of resources? If so, how would this look like? Is there a best
> >>>>> case?
> >>>>
> >>>>
> >>>> Hm. What about modifying corosync.conf to reflect hostname change on
> >>>> all nodes, restarting corosync on all one after another (so you always
> >>>> have at least 2 nodes running corosync and resources) and then
> >>>> changing that hostname on desired machine and restarting corosync on it?
> >>>>
> >>>> In general, do not stop corosync on more than 1 node at the time and
> >>>> you should be safe.
> >>>>
> >>>>> Cheers, Thorsten
> >>>>>
> >>>>> _______________________________________________ Pacemaker mailing
> >>>>> list: Pacemaker at oss.clusterlabs.org
> >>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
> >>>>>
> >>>>> Project Home: http://www.clusterlabs.org Getting started:
> >>>>> http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs:
> >>>>> http://bugs.clusterlabs.org
> >>>>
> >>>> -----BEGIN PGP SIGNATURE-----
> >>>> Version: GnuPG v2.0.19 (GNU/Linux)
> >>>> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
> >>>>
> >>>> iQEcBAEBAgAGBQJQRb4AAAoJEG+ytY6bjOob0AUH+gKl8OXHnGUUkXe4rFNc1qqr
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> >>>> =tZ+G
> >>>> -----END PGP SIGNATURE-----
> >>>>
> >>>> _______________________________________________
> >>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
> >>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
> >>>>
> >>>> Project Home: http://www.clusterlabs.org
> >>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> >>>> Bugs: http://bugs.clusterlabs.org
> >>>
> >>>
> >>>
> >>> --
> >>> Mit freundlichen Gruessen / Kind regards
> >>> Thorsten Rehm
> >>
> >>
> >>
> >> --
> >> Mit freundlichen Gruessen / Kind regards
> >> Thorsten Rehm
> >>
> >> _______________________________________________
> >> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
> >> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
> >>
> >> Project Home: http://www.clusterlabs.org
> >> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> >> Bugs: http://bugs.clusterlabs.org
> >
> >
> >
> > --
> > Dan Frincu
> > CCNA, RHCE
> 
> 
> 
> -- 
> Dan Frincu
> CCNA, RHCE
> 
> _______________________________________________
> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
> 
> Project Home: http://www.clusterlabs.org
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