Docker Systemd Unit File

postgres.service

[Unit]                                                                                       
Description=PostgreSQL container                                                             
Requires=docker.service                                                                      
After=docker.service         

[Service]                                                                                    
Restart=on-failure                                                                           
RestartSec=10                                                                                
ExecStartPre=-/usr/bin/docker stop postgres                                                  
ExecStartPre=-/usr/bin/docker rm postgres                                                    
ExecStart=/usr/bin/docker run --name postgres \                                               
 --volume /srv/db/postgres:/var/lib/pgsql/data \                                             
 kiasaki/alpine-postgres                                                                     
ExecStop=/usr/bin/docker stop postgres         

[Install]                                                                                    
WantedBy=multi-user.target