Create docker-compose service

Example of systemd service configuration with a docker-compose.yml file in the folder /opt/karnak (If it’s another directory you have to adapt the script).

By default, Docker needs root privileges to be executed.

Manage Docker as a non-root user

For more details, the following commands are inspired by the official Docker documentation.

1. Create the docker group.

    sudo groupadd docker
   

2. Add your user to the dockergroup.

   sudo usermod -aG docker $USER
   

3. Activate the changes to groups.

   newgrp docker
   

4. Verify that you can run docker commands without sudo.

   docker run hello-world
   

Specify User in the service

In the [Service] section of the karnak.service (see below), it’s possible to specify the user who will run the service.

User=root

Create the service

Instructions:

• Go to /etc/systemd/system
• Create the file ( eg: $ sudo touch karnak.service )
• Copy and paste the config below (eg: $ sudo nano karnak.service):

# /etc/systemd/system/karnak.service 

#########################
#    KARNAK             #
#    SERVICE            #	
##########################

[Unit]
Description=Docker Compose KARNAK Service
Requires=docker.service
After=docker.service network.target

[Service]
Type=oneshot
RemainAfterExit=yes
WorkingDirectory=/opt/karnak
ExecStart=/usr/local/bin/docker-compose up -d
ExecStop=/usr/local/bin/docker-compose down
TimeoutStartSec=0

[Install]
WantedBy=multi-user.target

Test the service:

• $ systemctl start karnak.service
• $ systemctl status karnak.service
• $ systemctl enable karnak.service