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Add ostree specific page and notes for #811

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Fixes: https://pagure.io/fedora-docs/release-notes/issue/811
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Timothée Ravier 2022-11-16 12:29:25 +01:00 • committed by pbokoc
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modules/release-notes/nav.adoc
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@ -13,6 +13,7 @@ include::{partialsdir}/entities.adoc[]
*** xref:sysadmin/System_Utilities.adoc[System Utilities]
*** xref:sysadmin/Printing_Scanning.adoc[Printing and Scanning]
*** xref:sysadmin/Mail_Servers.adoc[Mail Servers]
*** xref:sysadmin/Ostree.adoc[Ostree based variants]
** xref:desktop/Desktop_index.adoc[Desktop Users]
*** xref:desktop/I18n.adoc[Internationalization]
** xref:developers/Developers.adoc[Developers]

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modules/release-notes/pages/sysadmin/Ostree.adoc Normal file
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include::{partialsdir}/entities.adoc[]
= Changes for ostree based variants of Fedora
This page regroups changes that only apply to ostree/rpm-ostree based variants of Fedora, such as Fedora CoreOS, Fedora IoT, Fedora Silverblue and Fedora Kinoite.
[[fedora-coreos-major-changes]]
== Fedora CoreOS major changes
Major changes for Fedora CoreOS are list in the https://docs.fedoraproject.org/en-US/fedora-coreos/major-changes/[Major Changes page] in the https://docs.fedoraproject.org/en-US/fedora-coreos/[Fedora CoreOS documentation].
[[readonly-sysroot-ostree-desktopsl]]
== `/sysroot` mounted read only
On rpm-ostree based systems, the real root (the root directory of the root partition on the disk) is mounted under the `/sysroot` path.
By default it contains the state of the system (the content of `/var` and `/etc`) as well as the system versions themselves (each versioned copy of `/usr`) in the ostree repository (`/ostree/repo`).
Users and administrators are not expected to directly interact with the content available there and should instead use the interface offered by rpm-ostree, GNOME Software or soon Plasma Discover to manage their system.
Thus `/sysroot` is now mounted read only starting with this release.
New installations of all three variants will have `/sysroot` read only by default.
Existing installations of Fedora Silverblue and Fedora Kinoite will be migrated on the first boot to Fedora 37 and will have `/sysroot` read only on the next boot.
Fedora CoreOS has already made this change in a previous release (https://github.com/coreos/fedora-coreos-tracker/issues/1232[fedora-coreos-tracker#1232]).
See the https://fedoraproject.org/wiki/Changes/Silverblue_Kinoite_readonly_sysroot[Fedora change page] for more details.