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Services

  • Services in linux help us configure software that run in the background.

    • Services make sure that the software runs all the time automatically when the servers are rebooted and follow the right order of startup.
    • Web server or database server are example of services.

  • When we install a web server or docker they are automatically configured as services.

  • Starting the services
    • sudo systemctl start <service-name>
    • sudo service <service-name> start
    • Service command uses systemctl underneath.
  • Stopping a service
    • sudo systemctl stop <service-name>
  • Check the status of the service
    • sudo systemctl status <service-name>
  • Configure a service to start automatically when the system boots up
    • sudo systemctl enable <service-name>
    • We use disable if we don't want the service to start at startup

How to configure programs as a service

  • systemctl program is used to manage systemd services.
    • So to use our program as a service it has to be configured as a systemd service.
A systemd service is configured using a systemd unit file which may be located at /etc/systemd/system
  • The unit file must be named after the name of the service and must have .service extension
    • attachments/Pasted image 20220914114003.jpg
  • ExecStart directive is where we list the command that we want to run as a service.
  • We need to reload the systemd daemon to let systemd know that we have configured a new service.
    • sudo systemctl daemon-reload
  • The final step is to start the service
How do we configure the service to run automatically when the system boots up?

We need to make the following changes to the service file attachments/Pasted image 20220914114616.jpg
This means that the service will run after the multi-user service. Now we have to enable the service to start at boot up.

Last updated: 2022-09-14