[ClusterLabs] pacemaker and cluster hostname reconfiguration

Riccardo Manfrin riccardo.manfrin at athonet.com
Thu Oct 1 15:10:26 EDT 2020

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

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

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.


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
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