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docs: update documentation with new sections and improve clarity

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Jan Rundshagen 2025-03-29 13:11:47 +01:00 • committed by Jan O. Rundshagen
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docs/introduction.md
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# Introduction
Watchtower is an application that will monitor your running Docker containers and watch for changes to the images that those containers were originally started from. If watchtower detects that an image has changed, it will automatically restart the container using the new image.
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 will pull down your new image, gracefully shut down your existing container and restart it with the same options that were used when it was deployed initially.
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Every day 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).