Host Renaming

Following steps are required to rename a host.

Introduce New Hostname

For sysdb create a new node with bob as usual. For reference do

OLD_FQDN=my-old-hostname.psi.ch
NEW_FQDN=my-new-hostname.psi.ch
bob node list -v $OLD_FQDN

then add the new node

bob node add $NEW_FQDN $SYSDB_ENV
bob node set-attr $NEW_FQDN [all attributes as listed above]

and the same for the MAC addresses:

for mac in $(bob node list-macs $OLD_FQDN); do echo bob node add-mac $NEW_FQDN $mac; done

In Hiera ensure that a host specific configuration file exists for the FQDN with the same content as for the old hostname.

On the node as root run

hostnamectl set-hostname $NEW_FQDN
rm -rf /etc/puppetlabs/puppet/ssl
puppet agent -t

which changes the local hostname, removes the local Puppet certificate and updates the configuration with Puppet using the new hostname.

change DNS entry if a static IP address is assigned
redo SSL/TLS certificates with new hostname
if the host is icinga2 monitored you need to remove icinga2 from the host before running puppet so that a new cert, etc. is generated for the host

yum remove icinga2-common icinga2-bin icinga2
rm -rf /var/lib/icinga2
rm -rf /etc/icinga2

bob node delete $OLD_FQDN
remove from Hiera
inform the Linux Team (linux-eng@psi.ch) so it can remove from Puppet server the certificate and other data and remove the computer object from the AD