A Fully Qualified Domain Name (FQDN) is the complete domain name for a specific computer, or host, on the internet. The FQDN consists of two parts: the hostname and the domain name. For example, an FQDN for a hypothetical root server might be server.domainname.com. FQDN is very important for using servers. Probably, this is a very easy task. But very often, we get some support email regarding setting FQDN on servers. Hence, we are making an article on it.
Procedure of setting FQDN on CentOS 7:
Step 1: Login to your server / VPS as root or as a user with root privilege.
Step 2: Check current hostname:
1 hostname
Step 3: You may also want to find out status of your server and its hostname using hostnamectl command:
1 hostnamectl status
Step 4: Now here’s the magic command to change default CentOS 7 hostname without having to reboot your server:
1 hostnamectl set-hostname fqdn.host.name
Note: Please change fqdn.host.name to your own FQDN hostname. Example:
1 hostnamectl set-hostname backup.vernalwebhosting.com
So if you issue the hostnamectl status command again, you’ll see it changed. But however you’ll only see it has really changed if you close current session and reopen new SSH session (get out and login back)
So your Fully Qualified Domain Name (FQDN) is set.
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