MongoDB authenticated Replica Set via environment variables

gistfile1.txt

[Unit]
Description=mongodb
Requires=docker.service
After=docker.service

[Service]
Restart=always
RestartSec=5s
TimeoutStartSec=0
KillMode=none
ExecStartPre=-/usr/bin/docker kill mongodb
ExecStartPre=-/usr/bin/docker rm mongodb
ExecStartPre=/usr/bin/mkdir -p /data/mongodb
ExecStartPre=/usr/bin/docker pull mongo:2.6
ExecStart=/opt/bin/context exec -g mongodb docker run -e KEY --rm -m 1g --name=mongodb -v /data/mongodb:/data/db -v /etc/mongodb:/etc/mongodb:ro -p 27017:27017 mongo:2.6 sh -c 'touch /keyfile; chmod 600 /keyfile; chown mongodb:mongodb /keyfile; echo $KEY | fold -w 64 > /keyfile; exec mongod --replSet rs0 --keyFile /keyfile'
ExecStop=/usr/bin/docker stop mongodb