mything.service

        Description=My thing
        
        # Requirements
        Requires=etcd.service
        Requires=docker.service
        
        # Dependency ordering
        After=etcd.service
        After=docker.service
        
        [Service]
        # Let processes take awhile to start up (for first run Docker containers)
        TimeoutStartSec=0
        
        # work correctly.
        KillMode=none
        
        # Get CoreOS environmental variables
        EnvironmentFile=/etc/environment
        
        # Pre-start and Start
        ExecStartPre=-/usr/bin/docker kill mything-%i
        ExecStartPre=-/usr/bin/docker rm mything-%i
        ExecStartPre=/usr/bin/docker pull gdoteof/my-image
        ExecStart=/usr/bin/docker run -d --name mything-%i gdoteof/my-image my_command $VAR1 $VAR2 $VAR3
        
        # Stop
        ExecStop=/usr/bin/docker stop mything-%i