Since centOS7, a new command for managing services - systemctl has been added. Through this command, it is very convenient to manage services on the system.
Open and close the service through systemctl
The following are the options related to opening and closing the service
start Start the service
stop Close the service
restart Restart the service
# 查看服务运行状况 # systemctl status atd ● atd.service - Job spooling tools Loaded: loaded (/usr/lib/systemd/system/atd.service; enabled; vendor preset: enabled) Active: active (running) since Sat 2020-11-07 16:20:59 CST; 3 days ago Main PID: 3002 (atd) CGroup: /system.slice/atd.service └─3002 /usr/sbin/atd -f Nov 07 16:20:59 iz8vb626ci0aehwsivxaydz systemd[1]: Started Job spooling tools. Nov 07 16:20:59 iz8vb626ci0aehwsivxaydz systemd[1]: Starting Job spooling tools...
# systemctl stop atd # systemctl start atd
Observe services on the system through systemctl
Using systemctl, you can check which services are currently running, and you can also check all services on the system. (Including those that are not started), you can also view a certain type of service. list-units Lists all currently started services. If the task option is not used, this option will be used by default. Add -a to display all services, including unstarted services--type=TYPE List services of a certain typeSee the demo below# 列出系统所有正在运行的服务 # systemctl UNIT LOAD ACTIVE SUB DESCRIPTION proc-sys-fs-binfmt_misc.automount loaded active running Arbitrary Executable File Formats File System Automoun sys-devices-pci0000:00-0000:00:03.0-virtio0-net-eth0.device loaded active plugged Virtio network device sys-devices-pci0000:00-0000:00:04.0-virtio1-virtio\x2dports-vport1p1.device loaded active plugged /sys/devices/pci0000:00/0000:00:04. …… # 列出系统正在运行的service类型的服务 # systemctl --type=service UNIT LOAD ACTIVE SUB DESCRIPTION aegis.service loaded active running LSB: aegis update. aliyun.service loaded active running aliyun-assist atd.service loaded active running Job spooling tools auditd.service loaded active running Security Auditing Service # 列出系统上所有服务,包括未运行的 # systemctl -a ……
Manage different operating environments (target units) through systemctl
In centos7, there are many target units, but here we only need to know a few commonly used target units. Commonly used target units are listed below:systemctl [选项] [unit.target] [选项] get-default:查看系统默认操作环境 set-default:设置系统默认操作环境 # 查看默认的操作环境 # systemctl get-default multi-user.target # 重新设置新的默认操作环境 # systemctl set-default graphical.target Removed symlink /etc/systemd/system/default.target. Created symlink from /etc/systemd/system/default.target to /usr/lib/systemd/system/graphical.target. # systemctl get-default graphical.target
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