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Blog: S6 Overlay (#462)
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blog/2020-04-12-s6-overlay.md
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blog/2020-04-12-s6-overlay.md
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---
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author: Franck Nijhof
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authorURL: https://twitter.com/frenck
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authorImageURL: /img/profile/frenck.png
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authorTwitter: frenck
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title: S6 Overlay for our Docker containers
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---
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Home Assistant uses a lot of different Docker containers for all kinds of
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purposes. Not only the Home Assistant Core that is available as Docker
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containers but also our Supervisor and all add-ons are leveraging Docker.
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In many situations, we need to run multiple processes in our containers,
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that all need to be managed. We used to do this using simple Bash scripting,
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but quickly learned we need a proper process manager to handle this.
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We decided to use the [S6 Overlay init system][s6-overlay], which is based on
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the excellent [S6][s6] toolset that provides process supervision and
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management, logging, and system initialization.
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The S6 Overlay has been added to our [Docker base images][base-imags],
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which is used by every Docker image Home Assistant ships.
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All containers have been updated, and changes are automatically handled by the
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Home Assistant Supervisor; For Home Assistant users, there is no noticeable
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impact.
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For users of the Home Assistant Core containers on Docker, this might impact
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the way you run or start the container. If you run your Home Assistant Core
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container with an override of the Docker entry point or command, you need to
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adapt those. For example, some container management systems, like Portainer
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and Synology, automatically override those for you so you are impacted.
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In those cases:
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- The entry point has changed to: `/init`
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- The command (CMD) has changed to: ` ` _(Empty/not set)_
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If you override the command endpoint to start Home Assistant, the init system
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in the entry point will still be active in the background and a second launch
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Home Assistant. This can lead to unexpected behavior.
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[base-imags]: https://github.com/home-assistant/docker-base
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[s6-overlay]: https://github.com/just-containers/s6-overlay
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[s6]: http://skarnet.org/software/s6/
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