60.14 Hostname Change
20201104
Changing the system hostname is not always
trivial. Over time it permeates to various files in /etc/. The
starting point to changing the hostname is with the
hostname command. For example to change the
hostname to zafira:
To ensure the changed hostname will survive a reboot edit
/etc/hostname to make the same change. This is where the name
is obtained at boot time.
Then search through /etc/ for occurrences of the old name,
porsche, and edit as required:
The hostname might be found in /etc/hosts,
/etc/mailname, /etc/motd,
/etc/postfix/main.cf, etc/ssh/ssh_host_dsa_key.pub,
/etc/ssh/ssh_host_rsa_key.pub,
/etc/ssh/ssh_host_ecdsa_key.pub, and various other apache,
ppp, ssh, and exim files, depending on the
setup. These can usually be edited by hand to replace the hostname.
While these changes can generally be made without any problem, there are rare occasions where the next reboot might complain. It’s useful to be careful, but not concerned!
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