Cannot setup hostname and FQDN Centos 7
The Red Hat documentation explicitly instructs you to use the fully qualified domain name as the machine's static hostname. Trying to name a server with a single unqualified name causes a variety of problems with various services, most notably email.
A host name can be a free-form string up to 64 characters in length. However, Red Hat recommends that both static and transient names match the fully-qualified domain name (FQDN) used for the machine in DNS, such as
host.example.com
.
You should be doing:
hostnamectl set-hostname server.example.com
You can also manually edit /etc/hostname
for the same effect; again, it should contain the FQDN.
# cat /etc/hostname
server.example.com
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John Doe
Updated on September 18, 2022Comments
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John Doe over 1 year
I'm now running CentOS-7.0-1406 and looks like i can't setup hostname properly. As far as i know, you need to setup hostname using hostnamectl set-hostname command and write FQDN in /etc/hosts. I have a centos machine and i want to set it's hostname to "server" and FQDN to "server.mydomain.com". I run hostnamectl command and edit /etc/hosts file:
[root@server ~]# hostnamectl set-hostname server [root@server ~]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 {inet_IP_here} server.mydomain.com server
At first everything looks fine, console displays hostname when i run hostname and it displays FQDN when i run hostname -f:
[root@server ~]# hostname server [root@server ~]# hostname -f server.mydomain.com
BUT after i reboot machine and run the same commands again, it starts to display FQDN as hostname:
[root@server ~]# hostname server.mydomain.com
I must say that it's a VPS server and i have no such problem when i do it on a local virtual machine. Also there is no any settings in VPS control panel which look like hostname. What reason might cause such problems?