[ClusterLabs] pacemaker and cluster hostname reconfiguration

[Igor Tverdovskiy]

Hi Riccardo,

As I see you have already handled the issue, but I would recommend using
static node names
in the corosync.conf instead of reference to hostname. I did so years ago
and now I have no issues
with hostname changes.

e.g.:
node {
            ring0_addr: 1.1.1.1
            name: my.node
            nodeid: 123456
        }

On Thu, Oct 1, 2020 at 10:10 PM Riccardo Manfrin <
riccardo.manfrin at athonet.com> wrote:

> Thank you for your suggestion Ken; I'm indeed on Centos7, but using
>
>     hostnamectl set-hostname newHostname
>
> in place of
>
>     hostname -f /etc/hostname
>
> didn't have any beneficial effect. As soon as I powered off one of the
> two nodes, the other one took the old hostnames back and drifted out of
> sync.
>
> The only way of doing this in the end was
>
> 1. rebooting the machine (close in time so that the first new corosync
> instance coming up never ever sees the old instance from the other node,
> or it gets the old hostnames again)
>
> 2. killing pacemakerd and corosync (and letting systemd bring them on up
> again).
>
> This second method appears to be the cleanest and more robust, and has
> the advantage that while primitives/services are unsupervised, they are
> not reloaded.
>
> I hope this can be of help to someone although I tend to think that my
> case was really a rare beast not to be seen around.
>
> R
>
> On 01/10/20 16:41, Ken Gaillot wrote:
> > Does "uname -n" also revert?
> >
> > It looks like you're using RHEL 7 or a derivative -- if so, use
> > hostnamectl to change the host name. That will make sure it's updated
> > in the right places.
> ________________________________
>
> Riccardo Manfrin
> R&D DEPARTMENT
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