Centos 7设定默认运行级别linux
Centos7 中再也不是使用 /etc/inittab 来配置运行级别，而是使用 systemd 来进行管理docker
[root@docker ~]# ll /lib/systemd/system/runlevel3.target lrwxrwxrwx. 1 root root 17 Feb 23 10:08 /lib/systemd/system/runlevel3.target -> multi-user.target [root@docker ~]# ll /lib/systemd/system/runlevel5.target lrwxrwxrwx. 1 root root 16 Feb 23 10:08 /lib/systemd/system/runlevel5.target -> graphical.target [root@docker ~]# 能够用来将默认(开机启动后)运行级别设定为3 [root@docker ~]# systemctl set-default multi-user.target Removed symlink /etc/systemd/system/default.target. Created symlink from /etc/systemd/system/default.target to /usr/lib/systemd/system/multi-user.target 切换运行级别3 [root@docker ~]# systemctl get-default multi-user.target ##runlevel 3 查看OS运行level runlevel Systemd介绍：http://www.178linux.com/48990