systemctl set-default multi-user.target

ln -sf /lib/systemd/system/multi-user.target /etc/systemd/system/default.target

如果想改回来用图形界面用

ln -sf /lib/systemd/system/graphical.target /etc/systemd/system/default.target

systemctl set-default multi-user.target  开机进入命令行界面

systemctl set-default graphial.target  开机进入图像界面

修改开机默认运行级别命令 

systemctl set-default multi-user.target或graphical.target

查看开机默认运行级别:

systemctl get-default

修改默认运行级别为图形方式:

systemctl set-default graphical.target

linux7.0开机进入命令行