Systemctl commonly used commands

Set boot

systemctl enable apache.service

Immediately start a service

$ sudo systemctl start apache.service

Stop a service immediately

$ sudo systemctl stop apache.service

Restart a service

$ sudo systemctl restart apache.service

Killing a child processes all services

$ sudo systemctl kill apache.service

Reload a service profile

$ sudo systemctl reload apache.service

Reload all modified configuration files

$ sudo systemctl daemon-reload

Display all of a Unit

$ systemctl show httpd.service

Value of the specified property of a Unit

$ systemctl show -p CPUShares httpd.service

Sets the specified property of a Unit

$ sudo systemctl set-property httpd.service CPUShares=500

Output profile status message list, there are four states:

enabled: Start link has been established
disabled: No link established start
static: The profile was not [Install] section (not performed), as the only other dependent configuration file
masked: The configuration file is prohibited to establish links start

$ systemctl list-unit-files

Once modify the configuration file, you need to let Systemd reload the configuration file, then restart to take effect.

$ sudo systemctl daemon-reload
$ sudo systemctl restart httpd.service

Journal

Systemd unified management of all the Unit's log, so we can easily use a journalctlcommand you can view all logs

View all logs

$ sudo journalctl

Show the last n lines of the log tail

$ sudo journalctl -n

View logs specified process

$ sudo journalctl _PID=1

Script view a log path

$ sudo journalctl /usr/bin/bash

Real-time scrolling display the latest log

$ sudo journalctl -f

The latest real-time scrolling display a log of Unit

$ sudo journalctl -u nginx.service -f

See specified priority (level and above) log, a total of eight
0: emerg
. 1: Alert
2: Crit
. 3: ERR
. 4: warning
. 5: Notice
. 6: info
. 7: Debug

$ sudo journalctl -p err -b

Author: tingshuo123
link: https: //www.jianshu.com/p/36150c09838b
Source: Jane books
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