How to change a server's hostname

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Update the following files:

/etc/hosts
/etc/hostname

Ubuntu 18.04

See current hostname and related info:

hostnamectl

Change hostname:

hostnamectl set-hostname my_new_hostname

Update /etc/hosts if necessary.

If cloud-init is installed, edit /etc/cloud/cloud.cfg

preserve_hostname: true

Postfix

update /etc/mailname
update /etc/postfix/main.cf
restart postfix

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