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watchtower/docs/remote-hosts.md

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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"

or

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.