Purpose of this article to demonstrate how to use systemd for Docker Compose.
What is systemd?
Systemd is a system and service manager for Linux operating systems. It is designed to replace the traditional init system and provides a unified interface for managing system services and processes. Systemd is responsible for starting and stopping services, managing dependencies between services, and handling system shutdown and reboot.
What is docker-compose?
Docker Compose is a tool for defining and running multi-container Docker applications. It allows you to define your application’s services in a YAML file, and then use a single command to create and start all the services from your configuration.
Let’s Begin
1. Create a project directory:
1
2
| mkdir -p /srv/myapp
cd /srv/myapp
|
2. Create a docker-compose.yml file with the following content:
1
2
3
4
5
6
| version: '3'
services:
web:
image: nginx:latest
ports:
- "3000:80"
|
3. Create a file /etc/systemd/system/myapp.service with the following content:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
| [Unit]
Description=MyApp
After=docker.service
Requires=docker.service
[Service]
Type=simple
WorkingDirectory=/srv/myapp
ExecStart=/usr/bin/docker-compose up
ExecStop=/usr/bin/docker-compose down
Restart=always
TimeoutStopSec=30
[Install]
WantedBy=multi-user.target
|
After in Unit section is used to specify the dependencies between services. In this case, we want to ensure that the docker.service is started before our myapp.service.
Requires in Unit section is used to specify the dependencies between services. In this case, we want to ensure that the docker.service is started before our myapp.service.
4. Reload systemd:
1
| sudo systemctl daemon-reload
|
5. Start the service:
1
| sudo systemctl start myapp.service
|
6. Enable the service:
1
| sudo systemctl enable myapp.service
|
5. Verify the service status:
1
| sudo systemctl status myapp.service
|
