View source for How to change a server's hostname

Update the following files:
* /etc/hosts
* /etc/hostname

== Ubuntu 18.04 ==
See current hostname and related info:
<pre>
hostnamectl
</pre>

Change hostname:
<pre>
hostnamectl set-hostname my_new_hostname
</pre>

Update <code>/etc/hosts</code> if necessary.

If <code>cloud-init</code> is installed, edit <code>/etc/cloud/cloud.cfg</code>
<pre>
preserve_hostname: true
</pre>

== Postfix ==
* update <code>/etc/mailname</code>
* update <code>/etc/postfix/main.cf</code>
* restart postfix