linux管理:centos7服务管理

# cat getserviceconfpath
#!/bin/bash
#用于获取服务的service文件的路径
svrname=$1
systemctl status $svrname |grep 'Loaded:' |awk -F'[;(]' '{print $2}'

运行级别

#1 更改运行级别
systemctl set-default  < xxx.target >     # 更改系统默认启动方式
systemctl set-default  multi-user.target  # 图形界面
systemctl set-default  graphical.target:  # 终端界面

#2 查看运行级别
systemctl get-default

#3 切换到运行级别3
systemctl isolate multi-user.target
systemctl isolate runlevel3.target
ln -sf /lib/systemd/system/multi-user.target /etc/systemd/system/default.target  # 默认启动运行级别3

#4 切换到运行级别5
systemctl isolate graphical.target
systemctl isolate runlevel5.target   
ln -sf /lib/systemd/system/graphical.target  /etc/systemd/system/default.target  # 默认启动运行级别5

#5 系统默认各运行级别设定
ls -Xl /lib/systemd/system/runlevel*.target
/lib/systemd/system/runlevel0.target -> poweroff.target
/lib/systemd/system/runlevel1.target -> rescue.target
/lib/systemd/system/runlevel2.target -> multi-user.target
/lib/systemd/system/runlevel3.target -> multi-user.target
/lib/systemd/system/runlevel4.target -> multi-user.target
/lib/systemd/system/runlevel5.target -> graphical.target
/lib/systemd/system/runlevel6.target -> reboot.target

centos7下的实现

chkconfig sshd on   #chkconfig依然可以使用.但是被转发
Note: Forwarding request to 'systemctl enable sshd.service'.
ln -s '/usr/lib/systemd/system/sshd.service' '/etc/systemd/system/multi-user.target.wants/sshd.service'   # 原理

systemctl disable sshd.service  # 关闭ssh
rm '/etc/systemd/system/multi-user.target.wants/sshd.service'   

服务管理