CentOS 7.x write boot start service

CentOS 7 above is initialized with SYSTEMD system, SYSTEMD is the latest initialization system (INIT) in Linux system, its main design goal is to overcome the inherent shortcomings of sysvinit, and improve the system startup speed. Details about the systemd are here.

SYSTEMD Service files end with. Service, such as now to build nginx for boot, if installed with yum install command, yum command will automatically create Nginx.service file, directly with the command

Systemcel Enable Nginx.service

Set the boot up.
Here I was compiled with the source code to install, so to manually create the Nginx.service service file.
A program that can run without logging on, exists in system service, i.e.:

/lib/systemd/system/

1. Create a Nginx.service file in the System services directory

Vim/lib/systemd/system/nginx.service

The contents are as follows

[Unit] Description=nginx After=network.target [Service] type=forking Execstart=/usr/local/nginx/sbin/nginx ExecReload=/usr /local/nginx/sbin/nginx-s Reload Execstop=/usr/local/nginx/sbin/nginx-s quitprivatetmp=true [Install] WantedBy= Multi-user.target

[Unit]: Description of the service
Description: Description Service
After: Describe the service category
settings for the [service] service run parameter
Type=forking is the form of a background run
Execstart specific run commands for the service
Execreload Reset Command
Execstop for Stop command
Privatetmp=true represents a separate temporary space allocated to the service
Note: The start, restart, and stop commands for [Service] all require absolute paths
Settings for service installation under [Install] run level, can be set to multi-user, i.e. system run level is 3

Save exit.

2. Set Boot up

Systemctl Enable Nginx.service

3.nginx command
Start Nginx Service

Systemctl Start Nginx.service

Set up boot from

Systemctl Enable Nginx.service

Stop Boot from booting

Systemctl Disable Nginx.service

View the current status of the service

Systemctl Status Nginx.service

Restart Service

Systemctl Restart Nginx.service View all services started

Systemctl list-units--type=service

Comparison of 4.Systemd command and Sysvinit command

sysvinit Command	Systemd Command	Notes
Service Foo Start	Systemctl Start Foo.service	Used to start a service (does not restart the existing one)
Service Foo Stop	Systemctl Stop Foo.service	Used to stop a service (and not restart the existing one).
Service Foo Restart	Systemctl Restart Foo.service	Used to stop and start a service.
Service Foo Reload	Systemctl Reload Foo.service	When supported, remount the configuration file without interrupting the wait operation.
Service Foo Condrestart	Systemctl Condrestart Foo.service	If the service is running then restart it.
Service Foo Status	Systemctl Status Foo.service	Reports whether the service is running.
ls/etc/rc.d/init.d/	Systemctl List-unit-files--type=service	Used to list the services that can be started or stopped.
Chkconfig foo on	Systemctl Enable Foo.service	Setting the service to Enabled at the next startup or when other trigger conditions are met
Chkconfig foo off	Systemctl Disable Foo.service	Setting the service to disabled at the next startup or when other trigger conditions are met
Chkconfig Foo	Systemctl is-enabled Foo.service	Used to check whether a service is configured to be enabled or disabled in the current environment.
Chkconfig–list	Systemctl List-unit-files--type=service	Output enabled and disabled for the service under each run level
Chkconfig foo–list	Ls/etc/systemd/system/*.wants/foo.service	Use to list which run levels the service is enabled and disabled under.
Chkconfig Foo–add	Systemctl Daemon-reload	Used when you create a new service file or change settings.
Telinit 3	Systemctl isolate Multi-user.target (or Systemctl isolate Runlevel3.target OR telinit 3)	Change the maximum user run level.

5.Sysvinit run level and systemd target table

Sysvinit Run Level	Systemd Target	Notes
0	Runlevel0.target, Poweroff.target	Shut down the system.
1, S, single	Runlevel1.target, Rescue.target	Single-user mode.
2, 4	Runlevel2.target, Runlevel4.target, Multi-user.target	User-defined/domain-specific runlevel. The default is equal to 3.
3	Runlevel3.target, Multi-user.target	Multi-user, non-graphical. Users can log on through multiple consoles or networks.
5	Runlevel5.target, Graphical.target	Multi-user, graphical. Typically, all run Level 3 services plus graphical logins.
6	Runlevel6.target, Reboot.target	Restart
Emergency	Emergency.target	Emergency Shell

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CentOS 7.x write boot start service