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watchtower/docs/container-selection.md

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By default, watchtower will watch all containers. However, sometimes only some containers should be updated.

If you need to exclude some containers, set the com.centurylinklabs.watchtower.enable label to false.

LABEL com.centurylinklabs.watchtower.enable="false"

Or, it can be specified as part of the docker run command line:

docker run -d --label=com.centurylinklabs.watchtower.enable=false someimage

If you need to include only containers with the enable label, pass the --label-enable flag or the WATCHTOWER_LABEL_ENABLE environment variable on startup and set the com.centurylinklabs.watchtower.enable label with a value of true for the containers you want to watch.

LABEL com.centurylinklabs.watchtower.enable="true"

Or, it can be specified as part of the docker run command line:

docker run -d --label=com.centurylinklabs.watchtower.enable=true someimage