On the computer

All distributions

Amanda

Change amanda's reference

• edit /etc/amandahosts
• replace the line with the previous hostname by the same one but with the new FQDN (hope it is clear)
• edit /etc/amanda/<config>/disklist
• replace the entries with the old hostname by the new one

LVM

TODO: develop procedure for renaming the volume group and document here (when / is on LVM as ours normally are, this may require rebuilding the initial RAM disk, re-configuring the boot manager, editing fstab ...).  Maybe useful links: https://we.riseup.net/debian/renaming-a-lvm-root-volume-group, https://bugzilla.redhat.com/show_bug.cgi?id=230190#c17 (RedHat),

Postfix

Change the postfix configuration

• edit /etc/mailname
• replace the hostname
• do the same with /etc/postfix/header_checks. It the file doesn't exist check the following JIRA issue: BLUE-689

There will also be references to the old hostname in /etc/postfix/generic and /etc/postfix/main.cf:

• postconf -e myhostname=<hostname>

• postconf -e mydestination=<hostname>,localhost.<domain>,localhost

Obvisouly replace <hostname> and <domain> by the appropriate values

Debian

Reference: Debian WIKI page on changing hostname.

Ubuntu

Change the hostname

• edit /etc/hostname
• edit /etc/hosts
• service hostname restart

Changes required on other computers

Backup systems

Amanda

TBC

Computer backed up on bafi

1. Find which file system it is backed up to and adjust directory name(s) accordingly.
2. Adjust directory and symlinks under /var/backup.

DHCP

LTSP

Not tested (may all be done by the commands above): if running or using any of avahi, CUPS, ejabberd, Exim, /etc/motd, OpenSSH server, ssmtp or sysklogd then read the  Debian WIKI page on changing hostname.

DNS servers

On DNS servers which have record(s) for the old name, change both the forward and reverse data files.

When the hostname of a system on the Blue Light LANs (192.168.10.0 and 192.168.28.0) is changed, the DNS service on backupserver will need re-configuring as documented in DNS server (bind) administration.

/etc/hosts files

On computers with an /etc/hosts file which has record(s) for the old name, change the line.

LDAP servers

Change the LDAP client's uri

• edit /etc/ldap.conf
• replace the uri=service.av to the appropriate hostname. Note: if the uri=ldapi:/// or anything else of the kind, leave it
• service slapd restart