[Linux-cluster] centos5 to RHEL6 migration

Terry td3201 at gmail.com
Mon Jan 9 03:31:38 UTC 2012

If it's not practical, am I left with building a new cluster from scratch?

On Sun, Jan 8, 2012 at 8:38 PM, Digimer <linux at alteeve.com> wrote:

> On 01/08/2012 06:39 PM, Terry wrote:
> > Hello,
> >
> > I am trying to gently migrate a 3-node cluster from centos5 to RHEL6.  I
> > have already taken one of the three nodes out and rebuilt it. My
> > thinking is to build a new cluster from the RHEL node but want to run it
> > by everyone here first. The cluster consists of a handful of NFS volumes
> > and a PostgreSQL database.  I am not concerned about the database.  I am
> > moving to a new version and will simply migrate that.  I am more
> > concerned about all of the ext4 clustered LVM volumes.  In this process,
> > if I shut down the old cluster, what's the process to force the new node
> > to read those volumes in to the new single-node cluster?  A pvscan on
> > the new server shows all of the volumes fine. I am concerned there's
> > something else I'll have to do here to begin mounting these volumes in
> > the new cluster.
> > [root at server ~]# pvdisplay
> >   Skipping clustered volume group vg_data01b
> >
> > Thanks!
>   Technically yes, practically no. Or rather, not without a lot of
> testing first.
>  I've never done this, but here are some pointers;
> <cman upgrading="yes" disallowed="1" ...>
> upgrading
>        Set this if you are performing a rolling upgrade of the cluster
>        between major releases.
> disallowed
>        Set this to 1 enable cman's Disallowed mode. This is usually
>        only needed for backwards compatibility.
> <group groupd_compat="1" />
>        Enable compatibility with cluster2 nodes. groupd(8)
>  There may be some other things you need to do as well. Please be sure
> to do proper testing and, if you have the budget, hire Red Hat to advise
> on this process. Also, please report back your results. It would help me
> help others in the same boat later. :)
> --
> Digimer
> E-Mail:              digimer at alteeve.com
> Freenode handle:     digimer
> Papers and Projects: http://alteeve.com
> Node Assassin:       http://nodeassassin.org
> "omg my singularity battery is dead again.
> stupid hawking radiation." - epitron
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