# Fedora CoreOS rebasing to Fedora Linux 41 Fedora Linux 41 was released today [[1]]. The Fedora CoreOS `testing` stream has been rebased and is currently rolling out. In two weeks, it will be promoted to the `stable` stream. For more information about Fedora 41, see the Fedora Project’s list of official Changes [[2]] and the Fedora CoreOS analysis of each Change [[3]]. The following changes require special attention: - Fedora CoreOS is dropping Wi-Fi firmware packages that were split into subpackages of linux-firmware [[4]]. If you are currently using Wi-Fi, see the documentation for how to keep it enabled [[5]]. - Composefs is now enabled by default [[6]]. Pay special attention to the known issues [[7]]. - In systemd v256 cgroups v1 support was disabled. If you’ve opted out of the cgroups v2 migration in the past, your system will fail to boot after upgrading. - moby-engine/Docker was updated in Fedora from version 24 to version 27. Please see the notes [[8]] with each release of moby and also the deprecated/removed features page [[9]] to see if there is any noteworthy changes for your use cases. Please test out the `testing` stream and report any issues in our issue tracker [[10]]. Thank you to everyone helping find issues by running the `next` and `testing` streams! The Fedora CoreOS Team [1]: https://fedoramagazine.org/announcing-fedora-linux-41/ [2]: https://fedoraproject.org/wiki/Releases/41/ChangeSet [3]: https://github.com/coreos/fedora-coreos-tracker/issues/1714 [4]: https://github.com/coreos/fedora-coreos-tracker/issues/1575 [5]: https://docs.fedoraproject.org/en-US/fedora-coreos/sysconfig-enabling-wifi/ [6]: https://docs.fedoraproject.org/en-US/fedora-coreos/composefs/ [7]: https://docs.fedoraproject.org/en-US/fedora-coreos/composefs/#_known_issues [8]: https://github.com/moby/moby/releases [9]: https://github.com/docker/cli/blob/master/docs/deprecated.md [10]: https://github.com/coreos/fedora-coreos-tracker/issues?q=sort%3Aupdated-desc+is%3Aissue+is%3Aopen To coreos@lists.fedoraproject.org coreos-status@lists.fedoraproject.org CC devel@lists.fedoraproject.org --- # Fedora CoreOS rebasing to Fedora Linux 40 Fedora Linux 40 was released today[[1]]. The Fedora CoreOS `testing` stream has been rebased and is currently rolling out. In two weeks, it will be promoted to the `stable` stream. For more information about Fedora 40, see the Fedora Project’s list of official Changes[[2]] and the Fedora CoreOS analysis of each Change[[3]]. The following changes require special attention: - Podman v5.0[[4]]: This release contains breaking changes. See the Podman website[[5]] and the tracker issue[[6]] for details. - Assign individual, stable MAC addresses for Wi-Fi connections[[7]]: If you are using Wi-Fi, then your system's MAC address will likely change after the update. Please test out the `testing` stream and report any issues in our issue tracker[[8]]. Thank you to everyone helping find issues by running the `next` and `testing` streams! The Fedora CoreOS Team [1]: https://fedoramagazine.org/announcing-fedora-linux-40/ [2]: https://fedoraproject.org/wiki/Releases/40/ChangeSet [3]: https://github.com/coreos/fedora-coreos-tracker/issues/1626 [4]: https://fedoraproject.org/wiki/Changes/Podman5 [5]: https://blog.podman.io/2024/03/podman-5-0-breaking-changes-in-detail/ [6]: https://github.com/coreos/fedora-coreos-tracker/issues/1629 [7]: https://fedoraproject.org/wiki/Changes/StableSSIDMACAddress [8]: https://github.com/coreos/fedora-coreos-tracker --- [4](https://discussion.fedoraproject.org/t/fedora-coreos-next-stream-rebased-to-fedora-linux-40/109729) https://discussion.fedoraproject.org/t/fedora-coreos-rebasing-to-fedora-linux-39/95330 --- - https://github.com/coreos/fedora-coreos-tracker/issues/1655 - https://github.com/coreos/fedora-coreos-tracker/labels/F40-Changes The Fedora Linux 40 Beta was released today[[1]] and our Fedora CoreOS `next` stream has been migrated to Fedora Linux 40 content. Existing nodes on the `next` stream will update as normal over the following days. The Fedora Project accepted changes for Fedora 40 are in the Wiki[[2]] and the Fedora CoreOS analysis of each change is documented in the tracker[[3]]. The following changes require special attention: - Podman v5.0 - https://fedoraproject.org/wiki/Changes/Podman5 - https://github.com/coreos/fedora-coreos-tracker/issues/1629 The following changes may impact some specific setups: - Switch to using OSBuild for most CoreOS boot image building - Newly deployed `qemu` or bare `metal` systems will use disk images built using OSBuild. - https://github.com/coreos/fedora-coreos-tracker/issues/1653 - Enable IPv4 Address Conflict Detection by default - Conflict detection can delay startup by ~200ms. - https://fedoraproject.org/wiki/Changes/Enable_IPv4_Address_Conflict_Detection - https://github.com/coreos/fedora-coreos-tracker/issues/1656 - Assign individual, stable MAC addresses for Wi-Fi connections - If you are using WiFi, then your systems MAC address will likely change after the update. - https://fedoraproject.org/wiki/Changes/StableSSIDMACAddress - Switch pam_userdb from BerkeleyDB to GDBM - If you have overlayed vsftpd on your systems and use pam_userdb, then you need to convert the database using the instructions from [pam_userdb](https://docs.fedoraproject.org/en-US/fedora/rawhide/system-administrators-guide/pam_userdb/). - https://fedoraproject.org/wiki/Changes/PamBerkeleyDBtoGdbm - https://github.com/coreos/fedora-coreos-tracker/issues/1634 Please test out the `next` stream over the coming weeks and report any issues in our issue tracker[[4]]. Thank you to everyone helping find issues by running the next stream! The Fedora CoreOS Team [1]: https://fedoramagazine.org/announcing-fedora-linux-40-beta/ [2]: https://fedoraproject.org/wiki/Releases/40/ChangeSet [3]: https://github.com/coreos/fedora-coreos-tracker/issues/1626 [4]: https://github.com/coreos/fedora-coreos-tracker