rhel7 很多命令和rhel6 都不一样了，大家需要学习喽。

先从hostnamectl 开始哈


[root@roidb02 ~]# hostnamectl
   Static hostname: roidb02
         Icon name: computer-vm
           Chassis: vm
        Machine ID: c3e6a26e2e00481f928f0c38b97cf5ab
           Boot ID: f7d681692d96485ea81b3524c7743647
    Virtualization: kvm
  Operating System: Red Hat Enterprise Linux Server 7.3 (Maipo)
       CPE OS Name: cpe:/o:redhat:enterprise_linux:7.3:GA:server
            Kernel: Linux 3.10.0-514.el7.x86_64
      Architecture: x86-64
[root@roidb02 ~]# hostnamectl status
   Static hostname: roidb02
         Icon name: computer-vm
           Chassis: vm
        Machine ID: c3e6a26e2e00481f928f0c38b97cf5ab
           Boot ID: f7d681692d96485ea81b3524c7743647
    Virtualization: kvm
  Operating System: Red Hat Enterprise Linux Server 7.3 (Maipo)
       CPE OS Name: cpe:/o:redhat:enterprise_linux:7.3:GA:server
            Kernel: Linux 3.10.0-514.el7.x86_64
      Architecture: x86-64
[root@roidb02 ~]# hostnamectl --help     帮助非常重要啊
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@roidb02 ~]# cat /etc/hostname   --配置文件
roidb02
[root@roidb02 ~]# hostnamectl set-hostname roidb01
[root@roidb02 ~]# cat /etc/hostname    --配置文件直接生效了有没有
roidb01
[root@roidb02 ~]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
[root@roidb02 ~]#
[root@roidb02 ~]#
[root@roidb02 ~]# init 6  --重启验证


Last login: Sun Oct 15 07:23:33 2017 from gateway
不拉不拉省略.........

..................

[root@roidb01 ~]#
[root@roidb01 ~]#
[root@roidb01 ~]#
[root@roidb01 ~]#
[root@roidb01 ~]#
[root@roidb01 ~]# hostnamectl
   Static hostname: roidb01
         Icon name: computer-vm
           Chassis: vm
        Machine ID: c3e6a26e2e00481f928f0c38b97cf5ab
           Boot ID: ec156edd01a84bdf8a4d8c91350a2ef2
    Virtualization: kvm
  Operating System: Red Hat Enterprise Linux Server 7.3 (Maipo)
       CPE OS Name: cpe:/o:redhat:enterprise_linux:7.3:GA:server
            Kernel: Linux 3.10.0-514.el7.x86_64
      Architecture: x86-64
[root@roidb01 ~]# cat /etc/hostname
roidb01
[root@roidb01 ~]#


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