create_a_simple_service

Systemd gives us the ability to create services out of almost anything. If you want to run an application and make sure that the application is available after a reboot, consider creating a service to manage that for you.

In this Demo, I’ll cover the following:

• Create a simple bash script to output the date to a log file.
• Setup the basic systemd service unit file.
• Reload systemd to pick up the new service.
• Enable, then start the service.
• Stop and restart the service.
• Test it with a server reboot.
• Root access is required.

There’s no documentation link for this. Please use google to search for anything specific. There are a lot of options available to you may need to add some like the user/group depending on the requirements of your application.

All the commands and code used in the demo are below

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COMMANDS:

vi simple_service.sh

````
#!/bin/bash
for i in {1..100}
do
echo $i "- " `date` > /tmp/simple.log
sleep 5
done
````

Sudo or root access for this section.

As root:
vi /etc/systemd/system/simple.service
[Unit]
Description=service to check the time
After=network.target

[Service]
ExecStart=/bin/bash /home/ec2-user/how2/simple_service/simple_service.sh

[Install]
WantedBy=multi-user.target

Then run these commands:

systemctl daemon-reload
systemctl start simple.service
systemctl enable simple.service
systemctl status simple.service

Tail the log file. Is it working?

Reboot the server.

Check if it's working?

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