1 centos6下修改hostname
[root@centos6 ~]$ hostname # 查看当前的hostnmae centos6.m.com [root@centos6 ~]$ vim /etc/sysconfig/network # 编辑network文件修改hostname行（重启生效） [root@centos6 ~]$ cat /etc/sysconfig/network # 检查修改 NETWORKING=yes HOSTNAME=centos6.m.com [root@centos6 ~]$ hostname centos6.m.com # 设置当前的hostname(立即生效） [root@centos6 ~]$ vim /etc/hosts # 编辑hosts文件，给127.0.0.1添加hostname [root@centos6 ~]$ cat /etc/hosts # 检查 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 centos6.m.com ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
2 centos7修改hostname
[root@centos7 ~]$ hostnamectl set-hostname centos7.m.com # 使用这个命令会立即生效且重启也生效 [root@centos7 ~]$ hostname # 查看下 centos7.m.com [root@centos7 ~]$ vim /etc/hosts # 编辑下hosts文件， 给127.0.0.1添加hostname [root@centos7 ~]$ cat /etc/hosts # 检查 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 centos7.m.com ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6