Redhat7:Managing services

Previously and Now..

In the old versions of Redhat services that used the SysV or upstart, had corresponding init scripts found in /etc/rc.d/init.d/ directory. These scripts could be modified as they were written in bash, and allowed the admin to control how and when the servics were started.

The init scripts have been replaced with systemd serice units. Each service unit ends with the .service file extension, but serve a similar purpose to the old init scripts.

The service units are used with the systemctl command, and while the service and chkconfig commands still exist they should be avoided.

Comparison of the service and systemctl commands

The examples below use the full .service notation, however the services can controlled while omitting this.

Comparison of Serice Utility and Systemctl
Service	systemctl	Description
service name start	systemctl start name.service	Start a Service
service name stop	systemctl stop service.name	Stops a service
service name restart	systemctl restart name.service	Restarts a service
service name condrestart	systemcrl tyy-restart name.service	Restarts a service only if running
service name reload	systemctl reload name.service	Reloads Configuration
service name status	systemctl status name.service systemctl is-active name.service	Checks is service is running
service -- status-all	systemctl list-units -- type service --all	Displays the status of all services

Comparison of the chkconfig Utilty with systemctl

Comparison of Serice Utility and Systemctl
chkconfig	systemctl	Description
chkconfig name on	systemctl enable name.service	Enable a Service
chkconfig name off	systemctl disable name.service	disable a service
chkconfig --list name	systemctl status name.service systemctl is-enabled name.service	Checks if a service is enabled
chkconfig --list	systemctl list-unit-files --type service	List all service and check if they are anabled