...
TBC. May involve re-generating certificates.
OpenVPN
Remove any OpenVPN client configuration for the old name: OpenVPN#Ontheclient
The next step is most commonly done on the client but may need to be done partly on the primary OpenVPN server, details in the linked section.
Set up the OpenVPN client under the new name: OpenVPN#Per-clientconfiguration%28serverandclient%29
Postfix
Update by editing:
...
Change the LDAP Address Book clients
OpenVPN server
On the primary OpenVPN server, revoke the client under its old name: OpenVPN#Ontheprimaryserver
Miscelaneous computers
/etc/hosts files
On computers with an /etc/hosts file which has record(s) for the old name, change the record(s).
git
ssh aliases
Update git.bluelightav.org:git:bluelight/bash library/aliases.BL.sh and push