example.service

[Unit]
Description=An Example Service

# This combo says if a service fails more than three times in 24 hours
# stop trying to start it for the rest of the 24 hours
StartLimitBurst=3
StartLimitInterval=24h

# This says this service must only be started after this other one
After=prod-btrdb.service

[Service]
# Always try restart on failure (up to StartLimitBurst)
Restart=always

# But wait a minute before trying to restart
RestartSec=1m

# Before you try starting the service, run this
ExecStartPre=/usr/bin/docker pull r.cal-sdb.org/sync2q-mir

# This is the command that actually starts the service
# %p is the name of the unit (example.service)
# --net puts it inside the named network
# -e sets environment variables
# -m limits memory
# -v mounts an external directory inside the container
ExecStart=/usr/bin/docker run \
  --name %p \
  --net fleet \
  -e BTRDB_ADDR=prod-btrdb.fleet:4410 \
  -e MONGO_ADDR=prod-mongo.fleet:27017 \
  -m 6G \
  -v /srv/sync:/etc/sync \
  r.cal-sdb.org/foobaz

# This is run when the service is shut down. Give it 50 seconds to stop
# naturally, then forcably stop and remove the container
ExecStop=/usr/bin/docker stop -t 50 %p ; /usr/bin/docker rm -f %p

[Install]
WantedBy=multi-user.target