CentOS 7.x allows you to set custom startup and add custom system services.

CentOS 7.x allows you to set custom startup and add custom system services.

Centos System Service Script directory:

 

1. /Usr/lib/systemd/

There are systems and users,

If you need to start a program that can run without logging on to the system, it exists in the system service, namely:

1. /Lib/systemd/system/

Otherwise, the program that can run only after the user logs on exists in the user

 

1/lib/systemd/system equals/usr/lib/systemd/system2/lib/systemd/user equals/usr/lib/systemd/user

 

 

 

The service ends with. service.

The following uses nginx as an example.

1. Create a service file

　　　

1 cd /lib/systemd/system/2 cp -p tuned.service httpd.service3 vim httpd.service

 

 1 [Unit] 2 Description=Apache Httpd Serveice 3 After=httpdlog.target 4  5 [Service] 6 Type=forking 7 ExecStart=/usr/local/apache2/bin/apachectl start 8 ExecReload=/usr/local/apache2/bin/apachectl restart 9 ExecStop=/usr/local/apache2/bin/apachectl stop10 PrivateTmp=true11 12 [Install]13 WantedBy=multi-user.target14 ~

 

[Unit]: Service Description

Description: describes the service.
After: Describes the service category.

[Service] Service running parameter settings

Type = forking is the form of background running
ExecStart is the specific running command of the service.
ExecReload is the restart command
ExecStop is the Stop command
PrivateTmp = True indicates that an independent temporary space is allocated to the service.
Note: the absolute path is required for the [Service] startup, restart, and stop commands.

[Install] service installation settings, which can be set to multiple users

2. Save the Directory

Save as 754 permissions in the directory:

1. /Lib/systemd/system

3. Set auto-start upon startup

 

 

1. Systemctl enable nginx. service

 

4. Other commands

 

 

Task	Old commands	New command
Enable a service automatically	Chkconfig -- level 3 httpd on	Systemctl enable httpd. service
Disable Automatic startup of a service	Chkconfig -- level 3 httpd off	Systemctl disable httpd. service
Check service status	Service httpd status	Systemctl status httpd. service (service details) Systemctl is-active httpd. service (only show whether it is Active)
Show all started services	Chkconfig -- list	Systemctl list-units -- type = service
Start a service	Service httpd start	Systemctl start httpd. service
Stop a service	Service httpd stop	Systemctl stop httpd. service
Restart a service	Service httpd restart	Systemctl restart httpd. service

 

Start the nginx Service

systemctl start nginx.service

Set auto-start

systemctl enable nginx.service

Stop Auto-start

systemctl disable nginx.service

View Current Service Status

systemctl status nginx.service

Restart the service

systemctl restart nginx.service

View all started services

systemctl list-units --type=service