Example of how to start docker containers on system startup

Systemd Docker containers startup

[Unit]
Description=Docker container cdn-redis
Requires=docker.service
After=docker.service

[Service]
Restart=always
RestartSec=3
ExecStartPre=-/usr/bin/docker rm -f cdn-redis
ExecStart=/usr/bin/docker run --name=cdn-redis -v /data/cdn.ewf/redis:/data/cdn.ewf/redis cdn-redis:latest
ExecStop=/usr/bin/docker stop -t 2 cdn-redis
ExecStopPost=/usr/bin/docker rm -f cdn-redis

[Install]
WantedBy=default.target

-----8<-------------

[Unit]
Description=Docker container cdn-mongodb
Requires=cdn_redis.service
After=cdn_redis.service

[Service]
Restart=always
RestartSec=3
ExecStartPre=-/usr/bin/docker rm -f cdn-mongodb
ExecStart=/usr/bin/docker run --name=cdn-mongodb -v /data/cdn.ewf/mongodb:/data/cdn.ewf/mongodb cdn-mongodb:latest
ExecStop=/usr/bin/docker stop -t 2 cdn-mongodb
ExecStopPost=/usr/bin/docker rm -f cdn-mongodb

[Install]
WantedBy=default.target

-----------8<-------------

[Unit]
Description=Docker container cdn-php
Requires=cdn_mongodb.service
After=cdn_mongodb.service

[Service]
Restart=always
RestartSec=3
ExecStartPre=/usr/bin/sleep 3
ExecStart=/usr/bin/docker run \
        --name=cdn-php-fpm \
        -v /video:/video \
        -v /tmp:/tmp \
        --link=cdn-redis \
        --link=cdn-mongodb \
        -e REDIS_HOST=cdn-redis \
        -e MONGODB_HOST=cdn-mongodb \
        -v /data/cdn.ewf/web:/var/www/html/public/static cdn-php-fpm:latest
ExecStop=/usr/bin/docker stop -t 2 cdn-php-fpm
ExecStopPost=/usr/bin/docker rm -f cdn-php-fpm

[Install]
WantedBy=default.target
                     
-----------8<-------------

[Unit]
Description=Docker container cdn-nginx
Requires=cdn_php.service
After=cdn_php.service

[Service]
Restart=always
RestartSec=3

ExecStartPre=/usr/bin/sleep 3
ExecStartPre=-/usr/bin/docker rm -f cdn-nginx

ExecStart=/usr/bin/docker run -p 9981:80 --name=cdn-nginx --link=cdn-php-fpm --volumes-from=cdn-php-fpm:ro cdn-nginx:latest

ExecStop=/usr/bin/docker stop -t 2 cdn-nginx
ExecStopPost=/usr/bin/docker rm -f cdn-nginx

[Install]
WantedBy=default.target

-----------8<-------------
ExecStartPre=/usr/bin/sleep 3  - without this command containers having dependencies might fail to start.