+ *** xref:sysadmin/Ostree.adoc[Ostree based variants]

+ 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.