The hostname command displays the name of the current OpenBSD server or host. The superuser (root) can set the host name by editing a /etc/myname file. This is used at system boot time by netstart to initialize the hostname.
How to display hostname on OpenBSD
Type the any one of the following command
# hostname
# cat /etc/myname
Sample outputs:
openbsd.nixcraft.in
OpenBSD Chane Host Name
Simply login as root:
$ su -
OR
$ doas -s
Type the following command to change/update your hostname:
# echo "new-hostname.domain.com" > /etc/myname
# echo "server.nixcraft.in" > /etc/myname
# echo 'unixbox' > /etc/myname
Or edit using a text editor such as vi:
# vi /etc/myname
From the man page:
/etc/myname contains the symbolic name of the host machine. The file should contain a single line specifying the fully qualified domain name (FQDN) of the system (e.g. host.example.com). The name must be resolvable, either by matching a hostname specified in /etc/hosts (see hosts(5)) or through DNS (see resolv.conf(5)). The hostname is set via the hostname(1) utility at boot time. See hostname(7) for a description of hostname resolution.
During the system boot, netstart is executed. netstart performs the various operations including setting up the machine’s name. You can reboot box to test new settings:
# reboot
OR just set hostname at the cli i.e. no need to reboot the server:
# hostname server.nixcraft.in
You must edit /etc/hosts file too:
# vi /etc/hosts
Rename all old hostname to new hostname if present in that file. For more info see the following man pages:
$ man hostname
$ man 5 myname
$ man 5 hosts
$ man 8 netstart
$ man 1 su
$ man 1 doas
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To make hostname changes effective, one could issue this command:
hostname `cat /etc/myname`