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56 lines
2.3 KiB
Markdown
56 lines
2.3 KiB
Markdown
5 years ago
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Watchtower is itself packaged as a Docker container so installation is as simple as pulling the `containrrr/watchtower` image. If you are using ARM based architecture, pull the appropriate `containrrr/watchtower:armhf-<tag>` image from the [containrrr Docker Hub](https://hub.docker.com/r/containrrr/watchtower/tags/).
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Since the watchtower code needs to interact with the Docker API in order to monitor the running containers, you need to mount _/var/run/docker.sock_ into the container with the -v flag when you run it.
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Run the `watchtower` container with the following command:
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```bash
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docker run -d \
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--name watchtower \
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-v /var/run/docker.sock:/var/run/docker.sock \
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containrrr/watchtower
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```
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If pulling images from private Docker registries, supply registry authentication credentials with the environment variables `REPO_USER` and `REPO_PASS`
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or by mounting the host's docker config file into the container (at the root of the container filesystem `/`).
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Passing environment variables:
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```bash
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docker run -d \
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--name watchtower \
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-e REPO_USER=username \
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-e REPO_PASS=password \
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-v /var/run/docker.sock:/var/run/docker.sock \
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containrrr/watchtower container_to_watch --debug
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```
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Also check out [this Stack Overflow answer](https://stackoverflow.com/a/30494145/7872793) for more options on how to pass environment variables.
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Mounting the host's docker config file:
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```bash
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docker run -d \
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--name watchtower \
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-v /home/<user>/.docker/config.json:/config.json \
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-v /var/run/docker.sock:/var/run/docker.sock \
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containrrr/watchtower container_to_watch --debug
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```
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If you mount the config file as described above, be sure to also prepend the url for the registry when starting up your watched image (you can omit the https://). Here is a complete docker-compose.yml file that starts up a docker container from a private repo at dockerhub and monitors it with watchtower. Note the command argument changing the interval to 30s rather than the default 5 minutes.
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```json
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version: "3"
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services:
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cavo:
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image: index.docker.io/<org>/<image>:<tag>
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ports:
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- "443:3443"
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- "80:3080"
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watchtower:
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image: containrrr/watchtower
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volumes:
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- /var/run/docker.sock:/var/run/docker.sock
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- /root/.docker/config.json:/config.json
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command: --interval 30
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```
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