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[](https://blog.linuxserver.io"all the things you can do with our containers including How-To guides, opinions and much more!")
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[](https://discord.gg/YWrKVTn"realtime support / chat with the community and the team.")
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[](https://discourse.linuxserver.io"post on our community forum.")
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[](https://fleet.linuxserver.io"an online web interface which displays all of our maintained images.")
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[](https://github.com/linuxserver"view the source for all of our repositories.")
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[](https://opencollective.com/linuxserver"please consider helping us by either donating or contributing to our budget")
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[](https://blog.linuxserver.io"all the things you can do with our containers including How-To guides, opinions and much more!")
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[](https://discord.gg/YWrKVTn"realtime support / chat with the community and the team.")
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[](https://discourse.linuxserver.io"post on our community forum.")
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[](https://fleet.linuxserver.io"an online web interface which displays all of our maintained images.")
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[](https://github.com/linuxserver"view the source for all of our repositories.")
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[](https://opencollective.com/linuxserver"please consider helping us by either donating or contributing to our budget")
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The [LinuxServer.io](https://linuxserver.io) team brings you another container release featuring:
[](https://microbadger.com/images/linuxserver/bookstack"Get your own version badge on microbadger.com")
[](https://microbadger.com/images/linuxserver/bookstack"Get your own version badge on microbadger.com")
[Bookstack](https://github.com/BookStackApp/BookStack) is a free and open source Wiki designed for creating beautiful documentation. Feautring a simple, but powerful WYSIWYG editor it allows for teams to create detailed and useful documentation with ease.
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## Environment variables from files (Docker secrets)
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You can set any environment variable from a file by using a special prepend `FILE__`.
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You can set any environment variable from a file by using a special prepend `FILE__`.
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As an example:
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@@ -153,6 +152,11 @@ As an example:
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Will set the environment variable `PASSWORD` based on the contents of the `/run/secrets/mysecretpassword` file.
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## Umask for running applications
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For all of our images we provide the ability to override the default umask settings for services started within the containers using the optional `-e UMASK=022` setting.
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Keep in mind umask is not chmod it subtracts from permissions based on it's value it does not add. Please read up [here](https://en.wikipedia.org/wiki/Umask) before asking for support.
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## User / Group Identifiers
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When using volumes (`-v` flags) permissions issues can arise between the host OS and the container, we avoid this issue by allowing you to specify the user `PUID` and group `PGID`.
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## Docker Mods
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[](https://mods.linuxserver.io/?mod=bookstack"view available mods for this container.")
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[](https://mods.linuxserver.io/?mod=bookstack"view available mods for this container.")
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We publish various [Docker Mods](https://github.com/linuxserver/docker-mods) to enable additional functionality within the containers. The list of Mods available for this image (if any) can be accessed via the dynamic badge above.
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