By default, watchtower is set-up to monitor the local Docker daemon (the same daemon running the watchtower container itself). However, it is possible to configure watchtower to monitor a remote Docker endpoint. When starting the watchtower container you can specify a remote Docker endpoint with either the
--host flag or the
DOCKER_HOST environment variable:
docker run -d \ --name watchtower \ containrrr/watchtower --host "tcp://10.0.1.2:2375"
docker run -d \ --name watchtower \ -e DOCKER_HOST="tcp://10.0.1.2:2375" \ containrrr/watchtower
Note in both of the examples above that it is unnecessary to mount the /var/run/docker.sock into the watchtower container.