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Renamed centurylink to v2tec.
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README.md
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README.md
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# Watchtower
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[](https://circleci.com/gh/CenturyLinkLabs/watchtower)
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[](https://godoc.org/github.com/CenturyLinkLabs/watchtower)
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[](https://imagelayers.io/?images=centurylink/watchtower:latest 'Get your own badge on imagelayers.io')
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[](https://circleci.com/gh/v2tec/watchtower)
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[](https://godoc.org/github.com/v2tec/watchtower)
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[](https://microbadger.com/images/v2tec/watchtower "Get your own image badge on microbadger.com")
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A process for watching your Docker containers and automatically restarting them whenever their base image is refreshed.
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$ docker ps
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CONTAINER ID IMAGE STATUS PORTS NAMES
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967848166a45 centurylink/wetty-cli Up 10 minutes 0.0.0.0:8080->3000/tcp wetty
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6cc4d2a9d1a5 centurylink/watchtower Up 15 minutes watchtower
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6cc4d2a9d1a5 v2tec/watchtower Up 15 minutes watchtower
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```
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Every few mintutes watchtower will pull the latest *centurylink/wetty-cli* image and compare it to the one that was used to run the "wetty" container. If it sees that the image has changed it will stop/remove the "wetty" container and then restart it using the new image and the same `docker run` options that were used to start the container initially (in this case, that would include the `-p 8080:3000` port mapping).
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## Usage
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Watchtower is itself packaged as a Docker container so installation is as simple as pulling the `centurylink/watchtower` image.
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Watchtower is itself packaged as a Docker container so installation is as simple as pulling the `v2tec/watchtower` image.
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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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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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centurylink/watchtower
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v2tec/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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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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centurylink/watchtower nginx redis
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v2tec/watchtower nginx redis
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```
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In the example above, watchtower will only monitor the containers named "nginx" and "redis" for updates -- all of the other running containers will be ignored.
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Any of the options described below can be passed to the watchtower process by setting them after the image name in the `docker run` string:
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```
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docker run --rm centurylink/watchtower --help
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docker run --rm v2tec/watchtower --help
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```
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* `--host, -h` Docker daemon socket to connect to. Defaults to "unix:///var/run/docker.sock" but can be pointed at a remote Docker host by specifying a TCP endpoint as "tcp://hostname:port". The host value can also be provided by setting the `DOCKER_HOST` environment variable.
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```
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docker run -d \
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--name watchtower \
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centurylink/watchtower --host "tcp://10.0.1.2:2375"
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v2tec/watchtower --host "tcp://10.0.1.2:2375"
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```
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or
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docker run -d \
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--name watchtower \
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-e DOCKER_HOST="tcp://10.0.1.2:2375" \
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centurylink/watchtower
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v2tec/watchtower
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```
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Note in both of the examples above that it is unnecessary to mount the */var/run/docker.sock* into the watchtower container.
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--name watchtower \
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-e DOCKER_HOST=$DOCKER_HOST \
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-v $DOCKER_CERT_PATH:/etc/ssl/docker \
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centurylink/watchtower --tlsverify
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v2tec/watchtower --tlsverify
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```
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## Updating Watchtower
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If watchtower is monitoring the same Docker daemon under which the watchtower container itself is running (i.e. if you volume-mounted */var/run/docker.sock* into the watchtower container) then it has the ability to update itself. If a new version of the *centurylink/watchtower* image is pushed to the Docker Hub, your watchtower will pull down the new image and restart itself automatically.
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If watchtower is monitoring the same Docker daemon under which the watchtower container itself is running (i.e. if you volume-mounted */var/run/docker.sock* into the watchtower container) then it has the ability to update itself. If a new version of the *v2tec/watchtower* image is pushed to the Docker Hub, your watchtower will pull down the new image and restart itself automatically.
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