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What are the different classes of hostname?
Hostname is the name given to machine in the network for identification. In Linux there are three classes of hostname available.
- Static Hostname
- Transient Hostname
- Pretty Hostname
Static Hostname
Static hostname is the ordinary traditional hostname set by a user, the entry can be seen in /etc/hostname file. Static hostname have a restriction, it can only contain a-z,A-Z,0-9, "-","_"and ".". The static hostname shouldnot begin and end with ".",and shouldnot have two adjascent(nearby) "."
Static hostname can be set by:
hostnamectl set-hostname <host-name>
Transient Hostname
Transient hostname is a dynamic hostname set by system kernel. By default, transient hostname will be same as static hostname, but it can/will get changed runtime by DHCP and mDNS servers. Transient hostname is also operator configurable and can be configured by below command
hostnamectl set-hostname --transient <hostname>
Pretty Hostname
Pretty hostname will be defined by user to describe their system. Unlike transient and static hostname, pretty hostname is a free form hostname, which can have any valid UTF8 characters. Since Linux imposes a 64 characters limit for hostname, this limitation is applicable for pretty hostname also. To set pretty hostname, below command can be used.
hostnamectl --pretty set-hostname <hostname>Hostnamectl command and output
- Static, transient, pretty hostname is set using below three commands.
[root@lc ~]# hostnamectl set-hostname Linux-Data-Hub
[root@lc ~]# hostnamectl set-hostname --transient Transie-LDH
[root@lc ~]# hostnamectl --pretty set-hostname "$(perl -CO -le 'print "\x{1f389}"')"
- If you see the above pretty hostname command, im trying to put
🎉as hostname - hostnamectl output shows all the three hostnames
