We have this set to “process.” This causes systemd to use the SIGTERM signal on the main process only.

KillMode: Defines how systemd should kill the process if we ask systemctl to stop the service.

RestartSec: How long to wait before attempting to restart the service.

Restart: When and if the service should be restarted.

ExecStart: The path to the process that should be started.

systemd will consider this service started as soon as the process specified by ExecStart has been forked.

After: A list of unit names that should be started after this service has been successfully started, if they’re not already running.

Wants: Our service wants-but doesn’t require-the network to be up before our service is started.

Description: This is a text description of your service.

We need to create a unit file for our new service, but it is prudent to make sure none of the existing unit files have the name we want to give our new service. This holds certain attributes that systemd can use to locate and launch the program, and to define some of its behavior. sudo cp htg.sh /usr/local/binĪnd we need to make it executable: sudo chmod +x /usr/local/bin/htg.shĮach program that is started by systemd has a definition file, called a service unit file. We’ll copy the script to the /usr/local/bin directory. So, this script writes a timestamped message to the journal once per minute.

After 60 seconds the loop is repeated.

This is formatted into a message and sent to the journal. The TIMESTAMP variable is set to the current date and time.They’re not important errors or warnings. We’re using the -p (priority) option to indicate that our messages are for information (info) only. Entries to the journal are given a priority. The two echo lines are piped through systemd-cat, a program that takes the output from a program and sends it to the journal.

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