From Fedora Project Wiki

Revision as of 00:26, 8 January 2015 by Sinic (talk | contribs) (→‎What Does FedUp do?: Prior location of cache directory lead to CVE-2013-6494)

What is FedUp?

FedUp (FEDora UPgrader) is the name of a new system for upgrading Fedora installs in Fedora 18 and later. It replaces all of the previously recommended upgrade methods (PreUpgrade and DVD) that were been used in previous Fedora releases. Anaconda, the Fedora installer, has no built-in upgrade functionality in Fedora 18 or later. It has been completely delegated to FedUp.

Currently, FedUp is capable of handling upgrades between all still-supported Fedora releases using a network repository or a DVD image as the package source. Upgrades from EOL Fedora releases may work, but are not supported. More methods for upgrade are currently planned and this page will be updated as those features are completed.

What Does FedUp do?

The FedUp system consists of two parts - the client used to download packages and prepare for the upgrade and a pre-boot environment which does the actual upgrade using systemd and yum. More details are available in a blog post written by FedUp's primary author.

Files are downloaded to /var/cache/system-upgrade (or the specified --cachedir [to be implemented?]) and will be automatically cleaned up after the upgrade process is finished.

The FedUp Client

The FedUp client runs on the system to be upgraded. It gathers the packages needed for upgrade in addition to downloading the required initramfs and kernel needed for the actual upgrade. At this time, only the fedup command-line interface is implemented but a GUI interface is expected...sometime.

The Upgrade

The actual upgrade takes place when the system has been rebooted after running the FedUp client. The filesystems are mounted during boot, the already downloaded packages are installed and some upgrade-related tasks are performed. During the upgrade process, a special plymouth theme is used which has a progress bar to indicate current upgrade progress.

The Aftermath

Once the upgrade is complete, FedUp will reboot the system automatically. This is so you can run this part of the process unattended and return to the upgraded system, but if you leave any bootable media attached to the system during the upgrade process, the system may boot from that medium instead of the hard disk once the upgrade is complete. If you leave your system upgrading, come back, and see the Fedora installer or something similar...that's probably what happened!

Frequently Asked Questions

Why does my upgrade to Fedora 20 fail (immediately reboot to my old Fedora)?

Because we messed up! Sorry about that. FedUp 0.7, which was in the Fedora 18 and 19 stable repositories at the time of Fedora 20's release, cannot successfully upgrade to Fedora 20. FedUp 0.8, though, can do it just fine. You should use FedUp 0.8 to upgrade to Fedora 20. If you're upgrading from Fedora 18, you'll need to pass --nogpgcheck. See the Common Bugs page for all the details.

How do I report issues that I find with upgrades?

First see Common F20 bugs or Common F21 bugs to check if the problem is a very prominent issue we already know of. If it is not there, the component for reporting problems depends on the exact issue that you hit:

Issues with upgrade preparation

If you hit issues when using the FedUp client (fedup) before reboot, search or file a bug against FedUp using the version you are upgrading from.

Issues During Upgrade

If you hit issues after upgrade preparation and the initial reboot, search or file a bug against fedup-dracut using the version you are upgrading to.

Issues After Upgrade

If you hit issues after upgrade with a specific package, file a bug against the package with which you are having issues.

How do I Debug Issues During Upgrade?

A troubleshooting and debug guide will be written at some point and linked to from here.

Does FedUp verify the software it runs or installs during upgrade?

Since version 0.8, it does so by default. The package signing keys for newer Fedora releases are now sent to older Fedora releases in order to allow FedUp to verify the integrity of the packages it downloads. You can disable this function with the --nogpgcheck parameter if you need to do so for any reason.

Will packages in third party repositories be upgraded?

Yes, if they are set up like regular yum repositories and do not hard code the repository path. Commonly-used third party repositories usually work fine, but if you attempt to upgrade prior to or soon after an official Fedora release, they may not have updated their repository paths yet, and FedUp may be unable to find their packages. This will usually not prevent the upgrade running successfully, though, and you can update the packages from the third-party repository later.

Can I use FedUp to upgrade to a pre-release (e.g. a beta)?

Yes. After a Fedora release has been branched, it should be possible to upgrade to it using FedUp. It should also work after the Alpha and Beta releases. Of course, this function is as subject to temporary breakage as any other aspect of a pre-release.

See this email to the Fedora devel mailing list for more details.

How Can I Upgrade My System with FedUp?

As alluded to above, there are three parts to upgrading with FedUp - preparation, execution and cleanup.

Before you start doing anything, be sure to have a look at Common F20 bugs#Upgrade_issues or Common F21 bugs#Upgrade_issues and read about the most common bugs found.

Important Changes in the Upgrade process to Fedora 21

In order to select one of the new Fedora flavors, FedUp has new option, "--product=<PRODUCT>". To upgrade to the new Fedora Workstation, use --product=workstation. (This will also install all packages from the default Workstation installation, including the GNOME 3 desktop environment, in addition to upgrading the packages you already had installed.) If you would prefer to remain on the general, custom "track", use --product=nonproduct.

Here is the explanation given in the source code of fedup (https://github.com/wgwoods/fedup/blob/master/fedup/commandline.py): 

This installation of Fedora does not belong to a product, so you
must provide the --product=PRODUCTNAME option to specify what product
you want to upgrade to. PRODUCTNAME should be one of:

workstation: the default Fedora experience for laptops and desktops,
powered by GNOME.

server: the default Fedora experience for servers

cloud: a base image for use on public and private clouds

nonproduct: choose this if none of the above apply; in particular,
choose this if you are using an alternate-desktop spin of Fedora
Selecting a product will also install its standard package-set in
addition to upgrading the packages already on your system. If you
prefer to maintain your current set of packages, select 'nonproduct'

Preparing for the Upgrade

Latest fedup
Make sure that you install the latest version of the fedup client on the system to be upgraded. At the time of this writing (2014-12-09), that is fedup-0.9.0-2. Ensure you have fedup at level 0.9.0.2 or higher. Lower version of fedup were affected by BZ#1159292
  1. Do a full system update and reboot to ensure that any kernel changes are running
  2. Install fedup
    • Usually, it is best to try first with the latest fedup available in the stable update repository for the release you are running. If you encounter problems with the upgrade, and a newer fedup is available in the updates-testing repository for your current release, you may wish to try with this newer version: yum --enablerepo=updates-testing install fedup at the command line)

There are three options for sourcing the packages needed for upgrade - using a network repository, a local ISO file or a local device (hard drive, optical disk etc).

Network upgrade is strongly recommended
It is strongly recommended to use the network upgrade instead of offline update modes (ISO, local device). Network upgrade will ensure you receive the latest packages from the target release. If you use local media containing older packages, you might end up with a mixture of packages from your former and target release, and the system might not work properly until you fully update it after reboot (if it boots at all).

Network

Using a network source is the easiest method of upgrading and will pull in updates while upgrading - eliminating the potential issue if your current system has a newer kernel version than the Fedora release to which you are upgrading.

  1. Start the upgrade prep by executing following commands
    • sudo yum update fedup fedora-release
    • sudo fedup --network 21 --product=[workstation | server| cloud | nonproduct]
  1. Once the preparations have completed, check the /var/log/fedup.log file if any errors show up in the output from fedup

ISO File

In order to use an ISO file, it needs to exist locally on the filesystem of the system to be upgraded. The documentation is written as if that file is /home/user/fedora-21.iso but you will need to replace all instances of that path with the actual path of the ISO. Updates will be pulled in if you have network access on the machine to be upgraded.

  1. Download the Fedora 41 ISO appropriate for the arch that you are running
    • For the sake of example, we will assume that the ISO exists at /home/user/fedora-21.iso but it can be anywhere in the filesystem as long as you alter the path below to reflect the actual location of the ISO. Make sure you have downloaded Fedora DVD ISO image otherwise you will get an error "The given ISO probably isn't an install DVD image" when run fedup command.
  2. Start the upgrade prep by executing the following command
    • sudo fedup --iso /home/user/fedora-21.iso
  3. Once the preparations have completed, check the /var/log/fedup.log file if any errors show up in the output from fedup

Other Device

Optical drives and other mountable storage can also be used as a package source for upgrade preparations.

  1. Mount the source material
    • For the sake of example, we will assume that this source is mounted at /mnt/fedora but you can mount it anywhere as long as you replace /mnt/fedora in the command below with the actual mounted location of the upgrade source.
  2. Start the upgrade preparations by executing the following command
    • sudo fedup --device /mnt/fedora --debuglog=fedupdebug.log
  3. Once the preparations have completed, check the fedupdebug.log file if any errors show up in the output from fedup

Executing the Upgrade

  1. Reboot the system if fedup has completed without error.
  2. Once the system reboots, there should be a new entry in the GRUB menu titled System Upgrade.
  3. Select the System Upgrade option from the GRUB menu
    • Remark: If the System Upgrade item is not shown in the grublist at boot, it is most often caused by having a different grub, most often installed by another Linux distribution you may have in multiboot. To correct this quickly: reinstall grub:
      1. grub2-mkconfig -o /boot/grub2/grub.cfg
      2. grub2-install /dev/sda (replace /dev/sda by any other device you prefer to boot from)
  4. The system should boot into the upgrade process and a plymouth boot screen should be displayed
    • There is a root shell on VT2 so you can tinker with the system if something goes wrong. (To disable this, boot with rd.upgrade.noshell)
    • Press 'esc' to see a more detailed log. If you switch back to the graphical progress indicator, it may show 0% for the remainder of the upgrade but that does not mean the upgrade has stopped.
  5. Once the upgrade process has completed, the system will reboot and an option to boot Fedora 41 will be on the grub menu

Cleaning Up Post Upgrade

It is worth rebuilding the RPM DB to prevent RPMDB checksum error when doing a distribution sync:

sudo rpm --rebuilddb

There are a collection of post-upgrade things to do. Some of which are fixed by doing a distro sync:

sudo yum distro-sync --setopt=deltarpm=0

This tool search for .rpmnew, .rpmsave and .rpmorig files and ask you what to do with them: Keep current version, place back old version, watch the diff or merge.

sudo yum install rpmconf

sudo rpmconf -a

If you are using google-chrome from the Google repository, you must re-install google-chrome due to a packaging bug on the Google side of things. Make sure to adjust the command to the build type you would like to install:

sudo yum remove google-chrome-\* && sudo yum install google-chrome-[beta,stable,unstable]

Docs TODO

  • Write fedup troubleshooting and debug guide
  • add note about blob drivers if needed
Retrieved from "https://fedoraproject.org/w/index.php?title=FedUp&oldid=400125"