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A container-based solution for automating Docker container base image updates. Quick Start. With watchtower you can update the running version of your containerized app simply by pushing a new image to the Docker Hub or your own image registry.
Watchtower is a process that can update the running version of your containerized app by pulling down a new image from Docker Hub or your own registry. It is intended for homelabs, media centers, local dev environments, and similar, not for production or commercial use.
NameNameLast Commit MessageLast Commit Date4 years agochore (deps): bump github/codeql-action ...7 months agofix: set nopull param from args ( #1830)8 months agochore (deps): bump alpine from 3.18.5 to ...7 months agoMay 24, 2022 · Learn how to use Watchtower, a tool that automatically updates your Docker container's base image from a specified repository. Follow the steps to set up Watchtower with Docker's run command or Docker Compose, and get notifications for updates.
- Deploying Watchtower
- Using Watchtower
- Excluding and Including Containers
- Lifecycle Hooks
- Notifications and Monitoring
- Changing The Update Polling Interval
- Cleaning Up Old Images
- Running On-Demand
- Using Private Registries
- Conclusion
- GeneratedCaptionsTabForHeroSec
The first step is to start a Watchtower instance inside its own Docker container. Run the following command to download the Watchtower image and create a container: Your host's Docker socket is mounted into the Watchtower container with the -vflag. This allows Watchtower to interact with your host's Docker daemon instance. It's required so Watchtow...
Your Watchtower container immediately starts monitoring the other containers on your Docker host. It'll poll for image updates once every 24 hours and restart your containers when changes occur. New container retain the same options as the original that they're created from. Port binds, volume mounts, environment variables, and any other settings w...
You can customize which containers are monitored using a combination of Watchtower command arguments and Docker labels on your individual containers. Here's an example of starting a container which is opted-out of Watchtower updates using a label: It's also possible to whitelist the containers that should be updated, instead of opting out the ones ...
Watchtower can optionally run scripts inside your containers when specific events occur. Four hooks are available: 1. pre-check- Before Watchtower checks whether an update is available for the container. 2. pre-update- After an update has been found but before the container's restarted. 3. post-update- After an update has been completed. 4. post-ch...
Watchtower can send you notifications over email, Slack, Microsoft Teams, Gotify and Shoutrrr when container updates become available. Each of these delivery mechanisms needs to be configured separatelyby setting environment variables in your Watchtower container. Here's a basic example that uses Gmail: Watchtower also supports an operating mode wh...
Watchtower checks for new images every 24 hours. This interval can be changed with the --interval flag or WATCHTOWER_POLL_INTERVALenvironment variable. It accepts a value in seconds. Alternatively you can define a fixed polling schedule using cron syntax. This is accepted as the --schedule flag or WATCHTOWER_SCHEDULEenvironment variable.
Watchtower leaves the old version of container images on your host after a new one is pulled. Setting the --cleanup flag or WATCHTOWER_CLEANUPenvironment variable will delete old images after an update. This can significantly free up disk space over time.
Watchtower is designed to run as a long-lived daemon that continually monitors containers for updates. Sometimes you might want to manually check for new images on-demand. You can do this with the --run-oncecommand flag: This will perform a single update attempt for all your running containers. The Watchtower container will then stop and be removed...
Watchtower needs authentication details to check for updates to images in private registries. One way to supply them is by mounting your Docker config.json file to /config.jsonin your Watchtower container: There's a caveat with this approach: updates to config.json on your host won't necessarily be reflected inside the container. Commands like dock...
Watchtower lets you automate Docker container updates when new images are pushed to a registry. It's a highly customizable system that supports container blacklists and whitelists, advanced scheduling with cron syntax, and notifications delivered to several popular providers. Optional configuration parameters expose further functionality, such as r...
Learn how to use Watchtower, a tool that automatically updates your running Docker containers when a new image version is released. Watchtower can also run scripts, send notifications, and monitor your containers.
Watchtower is an application that monitors your Docker containers and restarts them with new images when they change. Learn how to use watchtower with examples and see how it works with centurylink/wetty-cli image.
Usage overview. 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.
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Apr 19, 2023 · Learn how to use Watchtower, a tool that monitors and updates your Docker containers with the latest images. Find out how to install, configure, and customize Watchtower with Docker and Docker Compose.
