[Linux-HA] Online extention of the cluster

[Andreas Kurz]

On 7/13/07, maloja01 at arcor.de <maloja01 at arcor.de> wrote:
> Is it possible to extent a running cluster with
> new cluster nodes?

The easiest way is to configure "autojoin any" in your ha.cf file,
which is safe if you use sha1 or md5 keys to authenticate in your
authkeys file. This allows every new
node which knows the key to join the cluster whithout the need for an
explicit "node" directive.

> The extention should be done without any stop of
> any resource placed on nodes, which are running
> in the cluster before we extend the cluster.
>
> If it is possible, can I use the "is_managed" attribute
> to leave the resources untouched, when I stop the
> cluster, do some changes (like updates), start the
> cluster and reset the "is_manged" attribute after
> all changes are done?

Yes, this method worked for me. Set all resourses to unmanaged and
make your changes, reenable it afterwards ... but first of all test
your updates on a test system ;-)

Regards,
Andreas