52 lines
2.4 KiB
Plaintext
52 lines
2.4 KiB
Plaintext
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<?xml version="1.0" encoding="utf-8"?>
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<page xmlns="http://projectmallard.org/1.0/" type="topic" id="realms">
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<info>
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<link type="guide" xref="index#user"/>
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</info>
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<title>Citadel Realms</title>
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<p>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.</p>
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<p>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.</p>
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<p>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.</p>
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<section>
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<title>The <em>current</em> realm</title>
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<p>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.</p>
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<p>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.</p>
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<p>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.</p>
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</section>
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<section>
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<title>Realm directory layout</title>
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<p>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.</p>
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<screen>/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</screen>
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<section>
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<title>/realms/config</title>
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<p>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.</p>
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</section>
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<section>
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<title>/realms/Shared</title>
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<p>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.</p>
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</section>
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</section>
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</page>
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