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Notes de sortie Fedora Core 5

Contents

Notes concernant l'installation

Cette section schématise les issues reliées a Anaconda le programme d'installation de Fedora Core et l'installation de Fedora Core 21 en général.

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Télécharger les grands fichiers
Si vous projetez de télécharger l'image ISO DVD de Fedora Core 21, sachez que les outils de téléchargement ne peuvent tous accommoder les fichiers supérieurs a 2Go de taille. wget 1.9.1-16 et supérieur, curl et ncftpget n'ont pas ces limitation et peuvent les télécharger sans encombre. BitTorrent est une autre méthode de téléchargement des grandes fichiers. Pour plus d'information sur l'usage et l'obtention des fichiers torrent, référez-vous au http://torrent.fedoraproject.org/.

Note sur Anaconda

  • Anaconda teste l'intégrité des médias d'installation par défaut. Cette fonction s'applique sur les méthodes d'installation par CD, DVD, ISO sur disque dur et ISO NFS. Le Projet Fedora recommande le test de tous les médias d'installation avant de démarrer le processus d'installation et de reporter les bogues relies a l'installation. La plupart des bogues reportes sont causes par les CD mal-graves. Pour utiliser ce test, entrez linux mediacheck a la ligne de boot:.

La fonction mediacheck est hautement sensible et peut reporter certains usages des disques comme défectueux. Ce résultat est cause par les logiciels des gravures des disques n'incluant pas les rembours lors du création du disques a partir du fichier ISO. Pour un meilleur résultat avec mediacheck, démarrer avec les commandes suivantes:

linux ide=nodma

Utilisez l'utilitaire sha1sum pour vérifier l'intégrité des disques avant de procéder a l'installation. Ce test identifie précisément les disques non valides ou identiques aux fichiers ISO.

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BitTorrent vérifie automatiquement l'intégrité des fichiers
Si vous utilisez BitTorrent, les fichiers sont automatiquement valides. Si votre fichier est complètement télécharge, vous n'avez pas besoin de vérifier. Cependant, vous devez utiliser mediacheck après avoir grave le CD.
  • Vous pouvez effectuer des tests de mémoire avant d'installer de Fedora en entrant memtest86 a la ligne de commande boot: . Cette option exécute Memtest86 standalone memory testing software in place of Anaconda. Memtest86 memory testing continues until the Esc key is pressed.
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Memtest86 Availability
You must boot from Installation Disc 1 or a rescue CD in order to use this feature.
  • Fedora Core 21 supports graphical FTP and HTTP installations. However, the installer image must either fit in RAM or appear on local storage such as Installation Disc 1. Therefore, only systems with more than 192MiB of RAM, or which boot from Installation Disc 1, can use the graphical installer. Systems with 192MiB RAM or less will fall back to using the text-based installer automatically. If you prefer to use the text-based installer, type linux text at the boot: prompt.

Changes in Anaconda

  • The installer checks hardware capability and installs either the uniprocessor or SMP (Symmetric Multi Processor) kernel as appropriate in this release. Previous releases installed both variants and used the appropriate one as default.
  • Anaconda now supports installation on several IDE software RAID chipsets using dmraid. To disable this feature, add the nodmraid option at the boot: prompt. For more information, refer to DmraidStatus.
Warning (medium size).png
Do not boot only half of a dmraid RAID1 (mirror)
Various situations may occur that cause dmraid to break the mirror, and if you boot in read/write mode into only one of the mirrored disks, it causes the disks to fall out of sync. No symptoms arise, since the primary disk is reading and writing to itself. But if you attempt to re-establish the mirror without first synchronizing the disks, you could corrupt the data and have to reinstall from scratch without a chance for recovery. If the mirror is broken, you should be able to resync from within the RAID chipset BIOS or by using the dd command. Reinstallation is always an option.
  • Serial mice are no longer formally supported in Anaconda or Fedora Core.
  • The disk partitioning screen has been reworked to be more user friendly.
  • The package selection screen has been revamped. The new, simplified screen only displays the optional groups Office and Productivity (enabled by default), Software Development, Web Server, and Virtualization (Xen). The Minimal and Everything shortcut groups have been removed from this screen. However, you may still fully customize your package selection. The right-click context menu provides an easy way to select all of the optional packages within a group. Refer to http://fedoraproject.org/wiki/Anaconda/PackageSelection for more details.
  • Optional package selection has also been enhanced. In the custom package selection dialog, you can right-click any package group, and select or deselect all optional packages at one time.
  • Firewall and SELinux configuration has been moved to the Setup Agent (firstboot), the final phase of the graphical installation process.
  • The timezone configuration screen now features zooming areas on the location selection map.
  • This release supports remote logging via syslog. To use this feature, add the option syslog=host:port at the boot prompt. The :port specifier is optional.
  • Anaconda now renders release notes with the gtkhtml widget for better capability.
  • Kickstart has been refactored into its own package, pykickstart, and contains a parser and writers. As a result of this change, validation and extension is now much easier.
  • Anaconda now uses yum as the backend for solving package dependencies. Additional repositories such as Fedora Extras are expected to be supported during installation in a future release.

Installation Related Issues

  • Some Sony VAIO notebook systems may experience problems installing Fedora Core from CD-ROM. If this happens, restart the installation process and add the following option to the boot command line: pci=off ide1=0x180,0x386. Installation should proceed normally, and any devices not detected are configured the first time Fedora Core is booted.
  • Not all IDE RAID controllers are supported. If your RAID controller is not yet supported by dmraid, you may combine drives into RAID arrays by configuring Linux software RAID. For supported controllers, configure the RAID functions in the computer BIOS.

Upgrade Related Issues

Refer to DistributionUpgrades for detailed recommended procedures for upgrading Fedora.

In general, fresh installations are recommended over upgrades, particularly for systems which include software from third-party repositories. Third-party packages remaining from a previous installation may not work as expected on an upgraded Fedora system. If you decide to perform an upgrade anyway, the following information may be helpful.

  • Before you upgrade, back up the system completely. In particular, preserve /etc, /home, and possibly /opt and /usr/local if customized packages are installed there. You may wish to use a multi-boot approach with a "clone" of the old installation on alternate partition(s) as a fallback. In that case, creating alternate boot media such as GRUB boot floppy.
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System Configuration Backups
Backups of configurations in /etc are also useful in reconstructing system settings after a fresh installation.
  • After you complete the upgrade, run the following command:
rpm -qa --last > RPMS_by_Install_Time.txt

Inspect the end of the output for packages that pre-date the upgrade. Remove or upgrade those packages from third-party repositories, or otherwise deal with them as necessary.