57 lines
2.1 KiB
Plaintext
57 lines
2.1 KiB
Plaintext
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= Citadel Realms
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[topic]
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@link[guide >index#user]
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Citadel contains only the base operating system and the GNOME desktop, it does not
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include any applications. To be able to install and run applications Citadel can
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create spaces which are called Realms.
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A Realm is a container similar to a Docker or LXC container in which any Linux
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distribution could be installed. We use a Debian based image but it would not be
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difficult to create an image for another Linux distribution.
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The realm containers are launched with systemd-nspawn but this is a detail of
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how they are implemented and not something it is necessary to learn about in
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order to use them.
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== The $em(current) realm
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Multiple realms may be launched at once but the GNOME Desktop is only associated with
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one of the running realms. This realm is called the `current` realm.
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When displaying applications available to launch from the desktop, GNOME will only
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be aware of applications that are installed in the realm which is set as `current`
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and any application launched from the desktop will run inside this current realm.
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Setting another realm as current does not affect any applications that are already running.
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Changing the current realm only means that any further applications which are launched
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will now run in the newly chosen realm.
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== Realm directory layout
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The realms base directory is stored on the storage partition at `/storage/realms` and is bind mounted to `/realms` on the root filesystem for convenience.
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[screen]
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/realms
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config
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/Shared
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/skel
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/default.realm -> realm-main
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/realm-main
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/realm-project
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/realm-testing
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=== /realms/config
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This is the global realm configuration file. Options set in this file apply to every realm
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unless the same option has been overridden with a different value in the config file for
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a realm.
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=== /realms/Shared
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This directory is bind mounted to `/home/user/Shared` of each running realm that has
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the option `use-shared-dir` enabled. It's a convenient way to move files between
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different realms and between citadel and realms.
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