[root@localhost ~]# hostname
localhost.localdomain
[root@localhost ~]# set-hostname ABCD
-bash: set-hostname: command not found
[root@localhost ~]#
[root@localhost ~]# hostnamectl set-hostname ABCD
[root@localhost ~]#
[root@localhost ~]# hostname
abcd
[root@localhost ~]#
ssh재접속시 적용됨
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