How to change your VPS’s hostname

How to change your VPS’s hostname

If you recently changed your domain name, and want your server’s hostname to match, you’ve come to the right post πŸ™‚ .

Immediate, temporary way

The immediate way to do this, is with one simple command:

sudo hostname example.com

where example.com is your new domain name. Now, exit the SSH session, and open a new one, and the hostname should have changed:

[email protected]:~$

if you don’t use bash, then check with the hostname command:

example.com

Persist across reboots

If you want the new hostname to persist across reboots, then you need to edit a few more files. First, edit /etc/hostname with:

sudo nano /etc/hostname

and edit the first, and only line, to your new domain. Next, you need to edit the /etc/hosts file, with:

sudo nano /etc/hosts

and change all lines with your old domain to your new one, which should just be 127.0.0.1, and the IPv6 equivalent if you have that enabled.

A few more considerations

When changing your domain name, make sure you also update the following(if you use them):

Postfix

Edit the config file:

sudo nano /etc/postfix/main.cf

and change all occurrences of your old domain with the new one.

Apache

Edit the virtual hosts:

sudo nano /etc/apache2/sites-enabled/*

and change all occurrences of your old domain with the new one.

NGINX

Edit the virtual hosts:

sudo nano /etc/nginx/sites-enabled/*

and change all occurrences of your old domain with the new one.

Lighttpd

Edit the virtual hosts:

sudo nano /etc/lighttpd/lighttpd.conf

and change all occurrences of your old domain with the new one.

Lets Encrypt

If you use Let’s Encrypt, be sure to get a certificate for your new domain, and remember to change all apps that use the SSL certificates to the new path.

Short way

If you’re lazy, use the sed way:

sudo sed -i 's/olddomain/newdomain/g' /path/to/file/here

after making a backup of course πŸ™‚

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