[root@ossec-server ~]# hostnamectl --help

hostnamectl [OPTIONS...] COMMAND ...

Query or change system hostname.

  -h --help              Show this help

     --version           Show package version

     --no-ask-password   Do not prompt for password

  -H --host=[USER@]HOST  Operate on remote host

  -M --machine=CONTAINER Operate on local container

     --transient         Only set transient hostname

     --static            Only set static hostname

     --pretty            Only set pretty hostname

Commands:

  status                 Show current hostname settings

  set-hostname NAME      Set system hostname

  set-icon-name NAME     Set icon name for host

  set-chassis NAME       Set chassis type for host

  set-deployment NAME    Set deployment environment for host

  set-location NAME      Set location for host

[root@localhost ~]# hostnamectl --static set-hostname ossec-server

[root@localhost ~]# hostnamectl set-hostname ossec-server