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====== Systems - Docker Main - Install Docker Containers - Install Watchtower ======

**Watchtower** monitors the running containers for changes to the image.

<WRAP info>
**NOTE:**  Once install, it requires no interaction.

  * It will automatically update and restart other containers.
</WRAP>


----

===== Install Watchtower =====

Within the Docker Main host, run:

<code bash>
docker run -d \
    --name watchtower \
    -v /var/run/docker.sock:/var/run/docker.sock \
    containrrr/watchtower
</code>    

----

===== Confirm Watchtower is running =====

Open Portainer.

Press **F5** to refresh.

<WRAP info>
**NOTE:** This should show the Watchtower container running.
</WRAP>

----

===== Edit Restart Policy =====

Within Portainer:

  * Select the Watchtower Container.
  * Click the **Duplicate/Edit**
  * Scroll down to **Advanced Container Settings**.
  * Select **Restart Policy**. 
  * Change to **Unless Stopped**.
  * Click **Deploy the Container**.
  * Click **Replace**.

<WRAP info>
**NOTE:**  This ensures that the container starts automatically if the host is restarted.
</WRAP>

----

===== References =====

https://github.com/containrrr/watchtower

https://containrrr.dev/watchtower/