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
Cyrus
TBC
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),
Name resolution
/etc/hosts If the name change includes a domain name change and the old domain name appears in /etc/hosts for the computer then it must be changed.
/etc/resolv.conf{,.head,.tail} If all these conditions are met ...
- The name change includes a domain name change.
- /etc/resolv.conf is either a local file or includes a local head or tail file.
- The local file(s) include a domain line.
... then any domain line(s) in /etc/resolv.conf{,.head,.tail} may need adjusting.
OpenLDAP
TBC. May involve re-generating certificates.
Postfix
Update by editing:
- /etc/aliases If it is changed, run the
newalises
command. - /etc/mailname
- /etc/postfix/header_checks If the file doesn't exist, create it using the procedure at http://wiki.bluelightav.org/x/PAIW . Do not restart or reload postfix until all files have been updated. If it is changed, run the
postmap
command on it, in the /etc/postfix directory. - /etc/postfix/generic If it is changed, run the
postmap
command on it, in the /etc/postfix directory.
Update /etc/postfix/main.cf by (replacing <hostname> and <domain>):
postconf -e myhostname=<hostname>
postconf -e mydestination=<hostname>,localhost.<domain>,localhost
Restart postfix:
/etc/init.d/postfix reload
In case there is undelivered mail from the old hostname, if not required it can be deleted using postsuper -d ALL
Debian
Reference: Debian WIKI page on changing hostname.
Ubuntu
Change the hostname
- edit /etc/hostname
- edit /etc/hosts
service hostname restart
On other computers
Backup systems
Amanda
TBC
Backed up on bafi
If the computer is backed up on bafi, either by push from the computer or pull from bafi:
- Find which file system it is backed up to and adjust directory name(s) accordingly.
- Adjust directories and symlinks under /var/backup.
DHCP servers
LTSP
- change the domain name in /etc/ltsp/dhcp.conf
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.
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
Change the LDAP Address Book clients
Name resolution
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 record(s).