Fedora

Red Hat Enterprise Linux (RHEL)

RHEL is a downstream distribution, based on Fedora, aimed at servers. There are various corporate and community distributions of Enterprise Linux (EL).

Comparison:

FEATURE

RHEL

Oracle Linux

AlmaLinux

Rocky Linux

Years of support

>= 12 [1]

10

10

10

Organization type

Profit

Profit

Non-profit [2]

Profit

Price

Free up to 16 servers [3]

Free

Free

Free

Optional paid support

Yes

Yes

Yes

Yes

Btrfs support

No

Yes [4]

No

No

Old hardware support

No

No

Yes [44]

No

Most popular EL distributions [29]:

  1. Rocky Linux

  2. RHEL

  3. AlmaLinux

  4. CentOS Stream

  5. Oracle Linux

Releases

Fedora releases:

Set root Password

As of Fedora 28, the root user password is disabled for security reasons. This means that traditional emergency mode will not work and instead result in this error [7]:

Cannot open access to console, the root account is locked.
See sulogin(8) man page for more details.

Press Enter to continue.

Set the root password to be able to enter emergency mode if ever needed:

$ sudo passwd root

If the password is not set and emergency mode needs to be accessed, Fedora provides a guide on how to chroot into the file system from a recovery media. Then the password can be changed from there.

Remove Flathub Filter

Starting with Fedora 38, the Flathub repository (used for installing community Flatpak packages) is no longer filtered to only be Fedora approved packages. [5] On Fedora 37 and older, the filter prevented installing popular packages such as Google Chrome. This filter can be removed. [6]

$ flatpak remote-list
Name    Options
fedora  system,oci
flathub system,filtered
$ sudo flatpak remote-modify flathub --no-filter
$ flatpak remote-list
Name    Options
fedora  system,oci
flathub system

Disable Automatic System Updates

Fedora will, at least, download package metadata by default and, at most, automatically install new packages. Updates can be disabled and handled manually instead.

  • Fedora (all):

    • Disable GNOME Software Center from checking for updates and applying updates.

      $ dconf write /org/gnome/software/allow-updates false
$ dconf write /org/gnome/software/download-updates false

    • Optionally also disable GNOME Software Center from starting on boot. [8]

      $ sudo rm -f /etc/xdg/autostart/org.gnome.Software.desktop

  • Fedora Workstation [9]:

    $ sudo -E ${EDITOR} /etc/dnf/dnf.conf
metadata_timer_sync=0
$ sudo systemctl disable dnf-makecache.timer
$ sudo systemctl disable dnf-automatic.timer

  • Fedora Silverblue [10]:

    $ sudo vim /etc/rpm-ostreed.conf
[Daemon]
AutomaticUpdatePolicy=none
$ sudo rpm-ostree reload
$ sudo systemctl disable rpm-ostreed-automatic.timer

Workstation Upgrades

  • Update to the latest minor version of Fedora. Reboot when finished to load the changes.

    $ sudo dnf upgrade --refresh
$ sudo reboot

  • Install the upgrade plugin.

    $ sudo dnf install dnf-plugin-system-upgrade

  • Download the packages for the next major version or do a skip upgrade to the version after that. Skip upgrades are fully supported on Fedora Workstation.

    $ sudo dnf system-upgrade download --releasever=<FEDORA_MAJOR_VERSION>

  • Install the upgraded packages. [30]

    $ sudo dnf system-upgrade reboot

Rawhide

Introduction

Fedora Rawhide is a rolling release of Fedora, built daily, and designed for developers to test with. It uses packages that are built from git repositories, release candidates, etc. that are considered to be usable. [35]

Switch to and from Rawhide

It is possible to switch from Fedora Rawhide back to a stable release. [36][37]

$ export FEDORA_RELEASE=39
$ sudo -E dnf distro-sync --releasever=${FEDORA_RELEASE} --refresh --disablerepo rawhide --enablerepo fedora --allowerasing --best

Alternatively, upgrade from a stable release to Fedora Rawhide.

$ sudo dnf distro-sync --releasever=rawhide --refresh --disablerepo fedora --allowerasing --best

rpm-ostree (Fedora CoreOS and Fedora Atomic Desktops)

Fedora CoreOS

Fedora CoreOS (FCOS) is a minimal operating system designed to run on servers. It is commonly used to run Kubernetes clusters such as OpenShift. It is a rolling release distribution and provides automatic updates. [42]

There are 3 update streams. Here they are in order of least frequently to most frequently updated [43]:

  1. stable

  2. testing = This provides the exact same package versions as Fedora Atomic Desktops and Fedora Workstations.

  3. next

  4. rawhide

Spins

Fedora provides installations with different desktop environments. These are known as spins. For rpm-ostree distributions, they have special code names listed below. [13][14] Fedora Silverblue was the first spin and was originally called Fedora Atomic Host. [15]

Fedora Spin

Desktop Environment

Silverblue

GNOME

Kinoite

KDE Plasma

Lazurite

LXQt [26]

Onyx

Budgie [27]

Sericea

Sway

Dual Booting

Fedora Silverblue does not support customized partitions or sharing a drive with a different operating system. It is recommended to use the automated installer to install it onto its own storage device. [11]

Through the use of os-prober (which is part of a default installation), a GRUB menu will be generated with all of the detected operating systems on each drive. This allows for partial dual-boot support.

Two installations of Fedora Silverblue on the same system are also not supported and will lead to issues. [12]

RPM GPG Keys

On Fedora Workstation, GPG keys used for signing RPMs and repositories need to be manually added to the trusted RPM database by running the command rpm --import <GPG_KEY>. That command does not work on rpm-ostree distributions due to that database being in the read-only file system. Instead, all of the /etc/pki/rpm-gpg/RPM-GPG-KEY-* keys are automatically trusted. [31]

Writable File System

Most directories in a Fedora Atomic Desktop are read-only. Some are writable to help store persistent data for user files, configuration files, and locally installed programs. Here are all of the writable paths. [38][39]

Symlink

Writable Path

/home

/var/home

/mnt

/var/mnt

/opt

/var/opt

/root

/var/roothome

/srv

/var/srv

/tmp

/var/tmp

/usr/local

/var/usrlocal

Persistent Mount

/boot

/boot/efi

/etc

/var

Build

Treefile

A treefile is a YAML text file that contains information about how to build the rpm-ostree distribution.

Common options [16][17]:

  • arch-include (map of lists of strings) = Treefiles to include if building for a specified CPU architecture.

    • aarch64 (list of strings) = Arm.

    • ppc64le (list of strings) = PowerPC.

    • s390x (list of strings) = IBM Z.

    • x86_64 (list of strings) = AMD or Intel.

  • automatic_version_prefix (string) = The major version of the operating system.

  • default_target (string) = The default systemd target to boot into.

  • document (boolean) = Default: true. If documentation should be installed. If set to false, RPMs will be installed with the nodocs flag to not install documentation.

  • etc-group-members (list of strings) = A list of groups to create. It is recommended to create the wheel group for sudo users.

  • exclude-packages (list of strings) = A list of recommended packages to not install.

  • include (string) = Include another treefile.

  • metadata (map of strings) = Optional metadata that will appear when running the command rpm-ostree compose tree --print-metadata-json.

  • modules (map of lists) = Modular stream repositories to enable.

    • enable (list of strings) = Repositories to enable with the format of <MODULE_NAME>:<MODULE_VERSION>. The actual repository configuration file to import needs to be defined at the top-level repos: list. [24][25]

  • mutate-os-release (string) = The major version of the operating system.

  • packages (list of strings) = A list of packages to install as part of the base distribution.

  • packages-<CPU_ARCHITECTURE> (list of strings) = A list of packages to install as part of the base distribution if the specified CPU architecture is being used.

  • postprocess-script (string) = A post processing script to run after building the rpm-ostree distribution.

  • ref (string) = The reference URL for where the rpm-ostree compose can be downloaded from. For example, Fedora uses the the reference fedora/<MAJOR_VERSION>/${basearch}/silverblue.

  • releasever (string) = The release version to use for RPM repositories.

  • repos (list of strings) = Repositories to enable. These repositories are sourced from a <REPOSITORY>.repo file that contains a valid RPM repository. For example, one of the repositories Fedora enables is from the fedora-<MAJOR_VERSION>.repo file.

  • selinux (boolean) = Default: true. If SELinux should be enabled.

Examples:

  • Use a modular stream repository to install a package.

    ---
packages:
  - akmkod-nvidia
  - nvidia-driver
  - nvidia-driver-cuda
modules:
  enable:
    - nvidia-driver:latest-dkms
repos:
  - nvidia-x86_64

  • Unofficial Fedora Silvernobara 37 [18]:

    ---
# File name: fedora-silvernobara.yaml
include: fedora-silverblue.yaml
ref: fedora/37/${basearch}/silvernobora
rojig:
  name: fedora-silvernobora
  summary: "Fedora Silverblue with Project Nobora enhancements"
  license: MIT
repos:
  - rpmfusion-nonfree
  - rpmfusion-nonfree-updates
  - rpmfusion-free
  - rpmfusion-free-updates
  - copr:copr.fedorainfracloud.org:gloriouseggroll:nobara:ml
  - copr:copr.fedorainfracloud.org:gloriouseggroll:nobara
  - copr:copr.fedorainfracloud.org:kylegospo:gnome-vrr
packages:
# Gaming related
  - gamescope
  - goverlay
  - mangohud
  - protonup-qt
  - vkBasalt
  - openal-soft
  - steam
  - obs-studio-gamecapture
  - obs-studio
  - vulkan-loader
  - vulkan-headers
  - mesa-libGLU
  - libglvnd
  - libdrm
# utilities
  - lm_sensors
  - corectrl
  - ffmpeg
  - python3-pip

  • Official Fedora Silverblue 38 [17]:

    ---
# File name: fedora-silverblue.yaml
include: gnome-desktop-pkgs.yaml
ref: fedora/38/${basearch}/silverblue
rojig:
  name: fedora-silverblue
  summary: "Fedora Silverblue base image"
  license: MIT
packages:
  - fedora-release-silverblue
  - desktop-backgrounds-gnome
  - gnome-shell-extension-background-logo
  - pinentry-gnome3
  # Does it really still make sense to ship Qt by default if we
  # expect people to run apps in containers?
  - qgnomeplatform
  # Include evince-thumbnailer otherwise PDF thumbnails won't work in Nautilus
  # https://github.com/fedora-silverblue/issue-tracker/issues/98
  - evince-thumbnailer
  # Include evince-previewer otherwise print previews are broken in Evince
  # https://github.com/fedora-silverblue/issue-tracker/issues/122
  - evince-previewer
  # Include totem-video-thumbnailer for video thumbnailing in Nautilus
  # https://pagure.io/fedora-workstation/issue/168
  - totem-video-thumbnailer

repos:
  - fedora-38
  - fedora-38-updates

    # File name: fedora-38.repo
[fedora-38]
name=Fedora 38 $basearch
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=fedora-38&arch=$basearch
enabled=1
gpgcheck=1
metadata_expire=1d

    # File name: fedora-38-updates.repo
[fedora-38-updates]
name=Fedora 38 $basearch Updates
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=updates-released-f38&arch=$basearch
enabled=1
gpgcheck=1
metadata_expire=1d

    ---
# File name: gnome-desktop-pkgs.yaml
include: fedora-common-ostree.yaml
packages:
  - ModemManager
  - NetworkManager-adsl
  - NetworkManager-openconnect-gnome
  - NetworkManager-openvpn-gnome
  - NetworkManager-ppp
  - NetworkManager-pptp-gnome
  - NetworkManager-ssh-gnome
  - NetworkManager-vpnc-gnome
  - NetworkManager-wwan
  - adobe-source-code-pro-fonts
  - at-spi2-atk
  - at-spi2-core
  - avahi
  - dconf
  - fprintd-pam
  - gdm
  - glib-networking
  - gnome-backgrounds
  - gnome-bluetooth
  - gnome-browser-connector
  - gnome-classic-session
  - gnome-color-manager
  - gnome-control-center
  - gnome-disk-utility
  - gnome-initial-setup
  - gnome-remote-desktop
  - gnome-session-wayland-session
  - gnome-session-xsession
  - gnome-settings-daemon
  - gnome-shell
  - gnome-software
  - gnome-system-monitor
  - gnome-terminal
  - gnome-terminal-nautilus
  - gnome-themes-extra
  - gnome-user-docs
  - gnome-user-share
  - gvfs-afc
  - gvfs-afp
  - gvfs-archive
  - gvfs-fuse
  - gvfs-goa
  - gvfs-gphoto2
  - gvfs-mtp
  - gvfs-smb
  - libcanberra-gtk3
  - libproxy-duktape
  - librsvg2
  - libsane-hpaio
  - mesa-dri-drivers
  - mesa-libEGL
  - nautilus
  - orca
  - polkit
  - rygel
  - systemd-oomd-defaults
  - tracker
  - tracker-miners
  - xdg-desktop-portal
  - xdg-desktop-portal-gnome
  - xdg-desktop-portal-gtk
  - xdg-user-dirs-gtk
  - yelp

    ---
# File name: fedora-common-ostree.yaml
ref: fedora/38/${basearch}/ostree-base

automatic_version_prefix: "38"
mutate-os-release: "38"

include: fedora-common-ostree-pkgs.yaml

# See https://github.com/coreos/bootupd
# TODO: Disabled until we use use unified-core or native container flow
# for the main build
# arch-include:
#   x86_64: bootupd.yaml
#   aarch64: bootupd.yaml

packages:
  # Do not include "full" Git as it brings in Perl
  - git-core
  # Explicitely add Git docs
  - git-core-doc
  - lvm2
  - rpm-ostree
  # Required for compatibility with old bootloaders until we have bootupd
  # See https://github.com/fedora-silverblue/issue-tracker/issues/120
  - ostree-grub2
  # Container management
  - buildah
  - podman
  - skopeo
  - toolbox
  # Provides terminal tools like clear, reset, tput, and tset
  - ncurses
  # Flatpak support
  - flatpak
  - xdg-desktop-portal
  # HFS filesystem tools for Apple hardware
  # See https://github.com/projectatomic/rpm-ostree/issues/1380
  - hfsplus-tools
  # Contains default ostree remote config to be used on client's
  # system for fetching ostree update
  - fedora-repos-ostree
  # the archive repo for more reliable package layering
  # https://github.com/coreos/fedora-coreos-tracker/issues/400
  - fedora-repos-archive

selinux: true
documentation: true
boot-location: modules
etc-group-members:
  - wheel
tmp-is-dir: true

ignore-removed-users:
  - root
ignore-removed-groups:
  - root
check-passwd:
  type: file
  filename: passwd
check-groups:
  type: file
  filename: group

default_target: graphical.target

packages-aarch64:
  - grub2-efi
  - efibootmgr
  - shim
packages-ppc64le:
  - grub2
packages-x86_64:
  - grub2-efi-ia32
  - grub2-efi-x64
  - grub2-pc
  - efibootmgr
  - shim-ia32
  - shim-x64

# Make sure the following are not pulled in when Recommended by other packages
exclude-packages:
  - PackageKit
  # We can not include openh264. See https://fedoraproject.org/wiki/OpenH264
  - gstreamer1-plugin-openh264
  - mozilla-openh264
  - openh264

postprocess:
  - |
    #!/usr/bin/env bash
    set -xeuo pipefail

    # Work around https://bugzilla.redhat.com/show_bug.cgi?id=1265295
    # From https://github.com/coreos/fedora-coreos-config/blob/testing-devel/overlay.d/05core/usr/lib/systemd/journald.conf.d/10-coreos-persistent.conf
    install -dm0755 /usr/lib/systemd/journald.conf.d/
    echo -e "[Journal]\nStorage=persistent" > /usr/lib/systemd/journald.conf.d/10-persistent.conf

    # See: https://src.fedoraproject.org/rpms/glibc/pull-request/4
    # Basically that program handles deleting old shared library directories
    # mid-transaction, which never applies to rpm-ostree. This is structured as a
    # loop/glob to avoid hardcoding (or trying to match) the architecture.
    for x in /usr/sbin/glibc_post_upgrade.*; do
        if test -f ${x}; then
            ln -srf /usr/bin/true ${x}
        fi
    done

    # Remove loader directory causing issues in Anaconda in unified core mode
    # Will be obsolete once we start using bootupd
    rm -rf /usr/lib/ostree-boot/loader
postprocess-script: "postprocess.sh"

    # File name: group
root:x:0:
bin:x:1:
daemon:x:2:
sys:x:3:
adm:x:4:
tty:x:5:
disk:x:6:
lp:x:7:
mem:x:8:
kmem:x:9:
wheel:x:10:
cdrom:x:11:
mail:x:12:
man:x:15:
dialout:x:18:
floppy:x:19:
games:x:20:
tape:x:33:
video:x:39:
ftp:x:50:
lock:x:54:
audio:x:63:
nobody:x:99:
users:x:100:
utmp:x:22:
utempter:x:35:
ssh_keys:x:999:
systemd-journal:x:190:
dbus:x:81:
polkitd:x:998:
etcd:x:997:
dip:x:40:
cgred:x:996:
tss:x:59:
avahi-autoipd:x:170:
rpc:x:32:
sssd:x:993:
dockerroot:x:986:
rpcuser:x:29:
nfsnobody:x:65534:
kube:x:994:
sshd:x:74:
chrony:x:992:
tcpdump:x:72:
input:x:104:
systemd-timesync:x:991:
systemd-network:x:990:
systemd-resolve:x:989:
systemd-bus-proxy:x:988:
cockpit-ws:x:987:

    # File name: passwd
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/usr/sbin/nologin
daemon:x:2:2:daemon:/sbin:/usr/sbin/nologin
adm:x:3:4:adm:/var/adm:/usr/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/usr/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
mail:x:8:12:mail:/var/spool/mail:/usr/sbin/nologin
operator:x:11:0:operator:/root:/usr/sbin/nologin
games:x:12:100:games:/usr/games:/usr/sbin/nologin
ftp:x:14:50:FTP User:/var/ftp:/usr/sbin/nologin
nobody:x:99:99:Nobody:/:/usr/sbin/nologin
dbus:x:81:81:System message bus:/:/usr/sbin/nologin
polkitd:x:999:998:User for polkitd:/:/usr/sbin/nologin
etcd:x:998:997:etcd user:/var/lib/etcd:/usr/sbin/nologin
tss:x:59:59:Account used by the trousers package to sandbox the tcsd daemon:/dev/null:/usr/sbin/nologin
avahi-autoipd:x:170:170:Avahi IPv4LL Stack:/var/lib/avahi-autoipd:/usr/sbin/nologin
rpc:x:32:32:Rpcbind Daemon:/var/lib/rpcbind:/usr/sbin/nologin
sssd:x:995:993:User for sssd:/:/usr/sbin/nologin
dockerroot:x:997:986:Docker User:/var/lib/docker:/usr/sbin/nologin
rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/usr/sbin/nologin
nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/usr/sbin/nologin
kube:x:996:994:Kubernetes user:/:/usr/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/usr/sbin/nologin
chrony:x:994:992::/var/lib/chrony:/usr/sbin/nologin
tcpdump:x:72:72::/:/usr/sbin/nologin
systemd-timesync:x:993:991:systemd Time Synchronization:/:/sbin/nologin
systemd-network:x:991:990:systemd Network Management:/:/sbin/nologin
systemd-resolve:x:990:989:systemd Resolver:/:/sbin/nologin
systemd-bus-proxy:x:989:988:systemd Bus Proxy:/:/sbin/nologin
cockpit-ws:x:988:987:User for cockpit-ws:/:/sbin/nologin

    ---
# File name: fedora-common-ostree-pkgs.yaml
packages:
  - NetworkManager
  - NetworkManager-bluetooth
  - NetworkManager-config-connectivity-fedora
  - NetworkManager-wifi
  - NetworkManager-wwan
  - abattis-cantarell-vf-fonts
  - acl
  - adwaita-qt5
  - alsa-ucm
  - alsa-utils
  - amd-gpu-firmware
  - atmel-firmware
  - attr
  - audit
  - b43-fwcutter
  - b43-openfwwf
  - basesystem
  - bash
  - bash-completion
  - bc
  - bind-utils
  - bluez-cups
  - btrfs-progs
  - bzip2
  - chrony
  - cifs-utils
  - colord
  - compsize
  - coreutils
  - cpio
  - cryptsetup
  - cups
  - cups-filters
  - curl
  - cyrus-sasl-plain
  - default-editor
  - dhcp-client
  - dnsmasq
  - e2fsprogs
  - ethtool
  - exfatprogs
  - fedora-bookmarks
  - fedora-chromium-config
  - fedora-flathub-remote
  - fedora-repos-modular
  - fedora-workstation-backgrounds
  - fedora-workstation-repositories
  - file
  - filesystem
  - firefox
  - firewalld
  - fpaste
  - fros-gnome
  - fwupd
  - gamemode
  - glibc
  - glibc-all-langpacks
  - glx-utils
  - gnupg2
  - google-noto-emoji-color-fonts
  - google-noto-naskh-arabic-vf-fonts
  - google-noto-sans-arabic-vf-fonts
  - google-noto-sans-armenian-vf-fonts
  - google-noto-sans-canadian-aboriginal-vf-fonts
  - google-noto-sans-cherokee-vf-fonts
  - google-noto-sans-cjk-ttc-fonts
  - google-noto-sans-ethiopic-vf-fonts
  - google-noto-sans-georgian-vf-fonts
  - google-noto-sans-gurmukhi-vf-fonts
  - google-noto-sans-hebrew-vf-fonts
  - google-noto-sans-lao-vf-fonts
  - google-noto-sans-math-fonts
  - google-noto-sans-mono-vf-fonts
  - google-noto-sans-sinhala-vf-fonts
  - google-noto-sans-thaana-vf-fonts
  - google-noto-sans-vf-fonts
  - google-noto-serif-vf-fonts
  - gstreamer1-plugins-bad-free
  - gstreamer1-plugins-good
  - gstreamer1-plugins-ugly-free
  - gutenprint
  - gutenprint-cups
  - hostname
  - hplip
  - hunspell
  - ibus-anthy
  - ibus-gtk3
  - ibus-gtk4
  - ibus-hangul
  - ibus-libpinyin
  - ibus-libzhuyin
  - ibus-m17n
  - ibus-typing-booster
  - intel-gpu-firmware
  - iproute
  - iptables-nft
  - iptstate
  - iputils
  - iwl100-firmware
  - iwl1000-firmware
  - iwl105-firmware
  - iwl135-firmware
  - iwl2000-firmware
  - iwl2030-firmware
  - iwl3160-firmware
  - iwl3945-firmware
  - iwl4965-firmware
  - iwl5000-firmware
  - iwl5150-firmware
  - iwl6000-firmware
  - iwl6000g2a-firmware
  - iwl6000g2b-firmware
  - iwl6050-firmware
  - iwl7260-firmware
  - iwlax2xx-firmware
  - jomolhari-fonts
  - kbd
  - kernel
  - kernel-modules-extra
  - khmer-os-system-fonts
  - less
  - liberation-mono-fonts
  - liberation-sans-fonts
  - liberation-serif-fonts
  - libertas-usb8388-firmware
  - libglvnd-gles
  - linux-firmware
  - logrotate
  - lohit-assamese-fonts
  - lohit-bengali-fonts
  - lohit-devanagari-fonts
  - lohit-gujarati-fonts
  - lohit-kannada-fonts
  - lohit-marathi-fonts
  - lohit-odia-fonts
  - lohit-tamil-fonts
  - lohit-telugu-fonts
  - lrzsz
  - lsof
  - man-db
  - man-pages
  - mdadm
  - mesa-dri-drivers
  - mesa-vulkan-drivers
  - mpage
  - mtr
  - nfs-utils
  - nss-altfiles
  - nss-mdns
  - ntfs-3g
  - ntfsprogs
  - nvidia-gpu-firmware
  - opensc
  - openssh-clients
  - openssh-server
  - paktype-naskh-basic-fonts
  - pam_afs_session
  - paps
  - passwd
  - passwdqc
  - pciutils
  - pinfo
  - pipewire-alsa
  - pipewire-gstreamer
  - pipewire-pulseaudio
  - pipewire-utils
  - plocate
  - plymouth
  - plymouth-system-theme
  - policycoreutils
  - policycoreutils-python-utils
  - procps-ng
  - psmisc
  - qemu-guest-agent
  - qgnomeplatform-qt5
  - qt5-qtbase
  - qt5-qtbase-gui
  - qt5-qtdeclarative
  - qt5-qtxmlpatterns
  - quota
  - realmd
  - rit-meera-new-fonts
  - rootfiles
  - rpm
  - rsync
  - samba-client
  - selinux-policy-targeted
  - setup
  - shadow-utils
  - sil-mingzat-fonts
  - sil-nuosu-fonts
  - sil-padauk-fonts
  - sos
  - spice-vdagent
  - spice-webdavd
  - sssd
  - sssd-common
  - sssd-kcm
  - stix-fonts
  - sudo
  - system-config-printer-udev
  - systemd
  - systemd-oomd-defaults
  - systemd-resolved
  - systemd-udev
  - tar
  - thai-scalable-waree-fonts
  - time
  - toolbox
  - tree
  - unzip
  - uresourced
  - usb_modeswitch
  - usbutils
  - util-linux
  - vazirmatn-vf-fonts
  - vim-minimal
  - wget
  - which
  - whois
  - wireplumber
  - words
  - wpa_supplicant
  - xorg-x11-drv-amdgpu
  - xorg-x11-drv-ati
  - xorg-x11-drv-evdev
  - xorg-x11-drv-fbdev
  - xorg-x11-drv-libinput
  - xorg-x11-drv-nouveau
  - xorg-x11-drv-qxl
  - xorg-x11-drv-wacom
  - xorg-x11-server-Xorg
  - xorg-x11-xauth
  - xorg-x11-xinit
  - zd1211-firmware
  - zip
  - zram-generator-defaults
packages-x86_64:
  - alsa-sof-firmware
  - hyperv-daemons
  - mcelog
  - microcode_ctl
  - open-vm-tools-desktop
  - thermald
  - virtualbox-guest-additions
  - xorg-x11-drv-intel
  - xorg-x11-drv-openchrome
  - xorg-x11-drv-vesa
  - xorg-x11-drv-vmware
packages-aarch64:
  - hyperv-daemons
  - open-vm-tools-desktop
  - xorg-x11-drv-armsoc
packages-ppc64le:
  - lsvpd
  - powerpc-utils

    #!/usr/bin/env bash
# File name: postprocess.sh
set -xeuo pipefail

# Setup unit & script for readonly sysroot migration:
# - https://fedoraproject.org/wiki/Changes/Silverblue_Kinoite_readonly_sysroot
# - https://bugzilla.redhat.com/show_bug.cgi?id=2060976

cat > /usr/lib/systemd/system/fedora-silverblue-readonly-sysroot.service <<'EOF'
[Unit]
Description=Fedora Silverblue Read-Only Sysroot Migration
Documentation=https://fedoraproject.org/wiki/Changes/Silverblue_Kinoite_readonly_sysroot
ConditionPathExists=!/var/lib/.fedora_silverblue_readonly_sysroot
RequiresMountsFor=/sysroot /boot
ConditionPathIsReadWrite=/sysroot

[Service]
Type=oneshot
ExecStart=/usr/libexec/fedora-silverblue-readonly-sysroot
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target
EOF

chmod 644 /usr/lib/systemd/system/fedora-silverblue-readonly-sysroot.service

cat > /usr/libexec/fedora-silverblue-readonly-sysroot <<'EOF'
#!/bin/bash
# Update an existing system to use a read only sysroot
# See https://fedoraproject.org/wiki/Changes/Silverblue_Kinoite_readonly_sysroot
# and https://bugzilla.redhat.com/show_bug.cgi?id=2060976

set -euo pipefail

main() {
    # Used to condition execution of this unit at the systemd level
    local -r stamp_file="/var/lib/.fedora_silverblue_readonly_sysroot"

    if [[ -f "${stamp_file}" ]]; then
        exit 0
    fi

    local -r ostree_sysroot_readonly="$(ostree config --repo=/sysroot/ostree/repo get "sysroot.readonly" &> /dev/null || echo "false")"
    if [[ "${ostree_sysroot_readonly}" == "true" ]]; then
        # Nothing to do
        touch "${stamp_file}"
        exit 0
    fi

    local -r boot_entries="$(ls -A /boot/loader/entries/ | wc -l)"

    # Ensure that we can read BLS entries to avoid touching systems where /boot
    # is not mounted
    if [[ "${boot_entries}" -eq 0 ]]; then
        echo "No BLS entry found: Maybe /boot is not mounted?" 1>&2
        echo "This is unexpected thus no migration will be performed" 1>&2
        touch "${stamp_file}"
        exit 0
    fi

    # Check if any existing deployment is still missing the rw karg
    local rw_kargs_found=0
    local count=0
    for f in "/boot/loader/entries/"*; do
        count="$(grep -c "^options .* rw" "${f}" || true)"
        if [[ "${count}" -ge 1 ]]; then
            rw_kargs_found=$((rw_kargs_found + 1))
        fi
    done

    # Some deployments are still missing the rw karg. Let's try to update them
    if [[ "${boot_entries}" -ne "${rw_kargs_found}" ]]; then
        ostree admin kargs edit-in-place --append-if-missing=rw || \
            echo "Failed to edit kargs in place with ostree" 1>&2
    fi

    # Re-check if any existing deployment is still missing the rw karg
    rw_kargs_found=0
    count=0
    for f in "/boot/loader/entries/"*; do
        count="$(grep -c "^options .* rw" "${f}" || true)"
        if [[ "${count}" -ge 1 ]]; then
            rw_kargs_found=$((rw_kargs_found + 1))
        fi
    done
    unset count

    # If all deployments are good, then we can set the sysroot.readonly option
    # in the ostree repo config
    if [[ "${boot_entries}" -eq "${rw_kargs_found}" ]]; then
        echo "Setting up the sysroot.readonly option in the ostree repo config"
        ostree config --repo=/sysroot/ostree/repo set "sysroot.readonly" "true"
        touch "${stamp_file}"
        exit 0
    fi

    # If anything else before failed, we will retry on next boot
    echo "Will retry next boot" 1>&2
    exit 0
}

main "${@}"
EOF

chmod 755 /usr/libexec/fedora-silverblue-readonly-sysroot

# Enable the corresponding unit
systemctl enable fedora-silverblue-readonly-sysroot.service
rpm-ostree compose

Once the treefiles have been created, the rpm-ostree distribution can be built. It is recommended to use either Fedora Silverblue or Fedora Workstation as the host operating system for the build since they provide the required dependencies. The rpm-ostree command has to be ran with elevated privileges or else it will not work properly.

  • Create a repository structure to host composed builds.

    $ sudo ostree --repo=<REPOSITORY_DIRECTORY> init

  • Build the rpm-ostree distribution.

    $ sudo rpm-ostree compose tree --unified-core --repo=<REPOSITORY_DIRECTORY> --cachedir=<CACHE_DIRECTORY> fedora-silverblue.yaml

  • Optionally, at a later date, check to see if there are updates available to the packages by running the command again without the cache.

    $ sudo rpm-ostree compose tree --unified-core --repo=<REPOSITORY_DIRECTORY> --force-nocache fedora-silverblue.yaml

  • Update the repository with metadata about the new build.

    $ sudo ostree summary --repo=<REPOSITORY_DIRECTORY> --update

  • The top-level directory that contains the repository directory needs to be hosted via a HTTP server.

  • If using an existing rpm-ostree distribuiton, it can switch to using the new build. It is recommended to pin the existing installation first. If SELinux will be enabled in the build, it also has to be enabled on the host.

    $ sudo ostree remote add <NEW_REMOTE_NAME> http://<IP_ADDRESS>/repo --no-gpg-verify
$ sudo ostree admin pin 0
$ sudo ostree remote refs <NEW_REMOTE_NAME>
$ sudo rpm-ostree rebase <NEW_REMOTE_NAME>:fedora/38/x86_64/silverblue

[17][18]

Container

A Containerfile can be used to create an Open Container Initiative (OCI) image for use as the root file system.

FROM <CONTAINER_REGISTRY>/<CONTAINER_REGISTRY_PROJECT>/<CONTAINER_NAME>:<CONTAINER_TAG>

The base container image to start with needs to have rpm-ostree installed and configured. Either use an existing image or use a Treefile to build a new base image.

bootc images should only be used when using bootc for deployment instead of traditional OSTree deployments. Otherwise, there are slight differences that can cause issues. bootc mounts the root file system as rw (not ro). [48] The root file system / is also shown as being an OverlayFS mount (instead of the root partition) with a small amount of storage space. That leads to incorrect reporting of available free space.

Existing Images

Minimal images [45]:

  • CentOS Stream = quay.io/centos-bootc/centos-bootc:stream9

  • Fedora = quay.io/fedora/fedora-bootc:40

  • Fedora CoreOS (following the latest stable Fedora Atomic Desktop version) = quay.io/fedora/fedora-coreos:testing

Images with desktop enviornments:

  • Fedora Atomic Desktop with GNOME = quay.io/fedora/fedora-silverblue

  • Fedora Atomic Desktop with KDE Plasma = quay.io/fedora/fedora-kinoite

In the Containerfile, set one of those images to be the FROM value. It is recommended to end each RUN command with && ostree container commit. DNF and RPM commands can be re-enabled by using RUN rpm-ostree cliwrap install-to-root / which will translate those to rpm-ostree commands. Real-world examples of how to customize these containers with rpm-ostree can be found here.

Some rpm-ostree arguments such as kargs do not work in a Containerfile. For that instance, it is recommended to use a Kickstart file to provide defaults kernel boot arguments by using bootloader --location=mbr --boot-drive=vda --append="<KEY>=<VALUE>". [49]

Treefile

Treefiles for Fedora-based distributions are available in these locations:

Build a container image archive.

  • First build:

    $ rpm-ostree compose image --initialize --format=ociarchive <TREEFILE>.yaml <CONTAINER_NAME>.ociarchive

  • Next builds:

    $ rpm-ostree compose image --initialize-mode=if-not-exists --format=ociarchive <TREEFILE>.yaml <CONTAINER_NAME>.ociarchive

Build a container image and then push it to a container registry. [46]

  • First build:

    $ rpm-ostree compose image --initialize --format=registry <TREEFILE>.yaml <CONTAINER_REGISTRY>/<CONTAINER_REGISTRY_PROJECT>/<CONTAINER_NAME>:<CONTAINER_TAG>

  • Next builds:

    $ rpm-ostree compose image --initialize-mode=if-not-exists --format=registry <TREEFILE>.yaml <CONTAINER_REGISTRY>/<CONTAINER_REGISTRY_PROJECT>/<CONTAINER_NAME>:<CONTAINER_TAG>

It is possible to convert an ostree repository to a container image [46] but not the other way around. [47]

$ ostree container encapsulate --repo=<OSTREE_REPOSITORY_PATH> <OSTREE_REFERENCE> docker://<CONTAINER_REGISTRY>/<CONTAINER_REGISTRY_PROJECT>/<CONTAINER_NAME>:<CONTAINER_IMAGE>

Authentication

Two files are supported by rpm-ostree for authentication to a private container registry [46]:

  • /etc/ostree/auth.json

  • /run/ostree/auth.json

Create this file by running:

$ sudo podman login --authfile /run/ostree/auth.json <CONTAINER_REGISTRY>

Kickstart

With a container image, it can be used with Kickstart to automatically install the operating system.

ostreecontainer --no-signature-verification --url <CONTAINER_REGISTRY>/<CONTAINER_REGISTRY_PROJECT>/<CONTAINER_NAME>:<CONTAINER_IMAGE>

For authenticating to a private repository, create the auth.json file as a %pre step. Use /etc/ostree/auth.json to permanently store the login credentials or /run/ostree/auth.json to temporarily store the login credentials during the installation.

User Management

Fedora Atomic Desktop uses nss-altfiles to manage users and groups. Configurations are specified in /usr/lib/ instead of /etc/. Traditional commands such as useradd and groupadd do not work.

Two files are managed by nss-altfiles:

  • /etc/passwd

    • /usr/lib/passwd

  • /etc/group

    • /usr/lib/group

Sometimes these files can drift from each other. If a new package was installed that adds a user and/or group, they need to be manually added to the relevant /etc/[group|passwd] configuration file. [50][51][52]

$ grep <USER> /usr/lib/passwd | sudo tee -a /etc/passwd

$ grep <GROUP> /usr/lib/group | sudo tee -a /etc/group

The full list of UIDs and GIDs used by Fedora can be found here. Avoid creating any new users or groups with these IDs.

When using rpm-ostree compose, this is the default configuration used by Fedora to manage users and groups:

ignore-removed-users:
  - root
ignore-removed-groups:
  - root
check-passwd:
  type: file
  filename: passwd
check-groups:
  type: file
  filename: group

It requires a passwd and group file to be fully configured and then it will copy them to /usr/lib/.

Reset

rpm-ostree allows resetting the packages to the default installed ones.

Remove layered packages:

$ sudo rpm-ostree uninstall --all

Remove overridden packages:

$ sudo rpm-ostree override reset --all

Reset all packages:

$ sudo rpm-ostree reset

[32][33]

Reset the persistent configuration, database files, and users [34]:

$ sudo rm -r -f /var/*
$ sudo rsync -rlv --delete --exclude fstab /usr/etc/ /etc/

Upgrades

Introduction

Unlike Fedora Workstation [19], rpm-ostree distributions do not officially support skip upgrades of going from X to X+2 because it is untested.

  • Minor update of a rpm-ostree distribution:

    $ sudo rpm-ostree update

  • Minor update with packages in testing [41]:

    $ sudo rpm-ostree rebase fedora:fedora/<FEDORA_MAJOR_VERSION>/x86_64/testing/silverblue

  • Major upgrade of Fedora Silverblue [20]:

    $ sudo rpm-ostree rebase fedora:fedora/<FEDORA_MAJOR_VERSION>/x86_64/silverblue

After an upgrade, clear the local cache. [40]

$ sudo rpm-ostree cleanup --base --repomd

rpm-ostree distributions have issues upgrading when there are third-party RPMs installed that are versioned for a specific version of Fedora. This can be worked around by doing an update that will also uninstall the old package and then re-install the new package.

  • Minor update of Fedora [21][22]:

    $ sudo rpm-ostree update \
    --uninstall rpmfusion-free-release --uninstall rpmfusion-nonfree-release --uninstall google-chrome-stable \
    --install rpmfusion-free-release --install rpmfusion-nonfree-release --install google-chrome-stable

  • Major upgrade of Fedora Silverblue [23]:

    $ sudo rpm-ostree rebase fedora:fedora/<FEDORA_MAJOR_VERSION_NEW>/x86_64/silverblue \
   --uninstall rpmfusion-free-release-<FEDORA_MAJOR_VERSION_ORIGINAL>-1.noarch \
   --uninstall rpmfusion-nonfree-release-<FEDORA_MAJOR_VERSION_ORIGINAL>-1.noarch \
   --install https://mirrors.rpmfusion.org/free/fedora/rpmfusion-free-release-<FEDORA_MAJOR_VERSION_NEW>.noarch.rpm \
   --install https://mirrors.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-<FEDORA_MAJOR_VERSION_NEW>.noarch.rpm

ostree Remotes

All remote update servers have their configuration files stored at /etc/ostree/remotes.d/<REMOTE>.conf. Here are the contents of the default Fedora remote configuration file fedora.conf:

[remote "fedora"]
url=https://ostree.fedoraproject.org
gpg-verify=true
gpgkeypath=/etc/pki/rpm-gpg/
contenturl=mirrorlist=https://ostree.fedoraproject.org/mirrorlist

A custom remote server can be added by either using the CLI or manually adding a configuration file.

  • CLI [28]:

    $ sudo ostree remote add --set=gpg-verify=false <REMOTE_NAME> '<REMOTE_REPO_URL>'

  • Configuration file:

    [remote "<REMOTE_NAME>"]
url=<REMOTE_REPO_URL>
gpg-verify=false

rpm-ostree Developer

Build the latest rpm-ostree RPMs for testing purposes.

$ git clone https://github.com/coreos/rpm-ostree.git
$ cd ./rpm-ostree/packaging/
$ sudo dnf install dnf-plugins-core rpm-build
$ sudo dnf builddep rpm-ostree.spec
$ make -f Makefile.dist-packaging rpm

Install the rpm-ostree and rpm-ostree-libs RPMs.

  • Fedora Workstation:

    $ sudo dnf install ./x86_64/rpm-ostree-<VERSION>.rpm ./x86_64/rpm-ostree-libs-<VERSION>.rpm

  • Fedora Atomic Desktop:

    $ sudo rpm-ostree override replace ./x86_64/rpm-ostree-<VERSION>.rpm ./x86_64/rpm-ostree-libs-<VERSION>.rpm

Troubleshooting

Errors

Error when trying to install a package with rpm-ostree.

  • Syntax:

    - cannot install both <NEW_PACKAGE> from <RPM_REPOSITORY> and <OLD_PACKAGE> from @System

  • Example:

    - cannot install both mesa-filesystem-24.0.9-1.fc40.i686 from updates and mesa-filesystem-24.0.5-1.fc40.i686 from @System

Solution:

  • Upgrade the package. This returns a non-zero exit code so in a Containerfile it needs to be set to always return true.

    $ sudo rpm-ostree override replace --experimental --from repo=<RPM_REPOSITORY> <PACKAGE>

    RUN rpm-ostree override replace --experimental --from repo=<RPM_REPOSITORY> <PACKAGE> || true

History

Bibliography

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