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Here are the steps you should follow if you want to upgrade one Fedora Core release (for example Fedora Core 3 to Fedora Core 4).

# Make sure all repo files(base, updates, extras) are in place
# Make sure all repositoryes are reacheable
# Download & install the new fedora release files

# Upgrade the system with Yum

‘'’Warning: DO NOT UPGRADE SYSTEMS WHICH HAVE ADMINISTRATION SOFTWARE(CONFIX, PLESK, CPANEL OR EXIM). THE UPGRADE WILL CRASH THE INSTALLED CONTROL PANEL. AND YOU WILL NEED REINSTALL”‘

== Repo files ==

You have to have this files in /etc/yum.repos.d :
fedora.repo
fedora-updates.repo

fedora-extras.repo

[fedora.repo]
[base]
name=Fedora Core $releasever - $basearch - Base
baseurl=http://==fedora_mirror==/$releasever/$basearch/os/
enabled=1
gpgcheck=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora

[fedora-updates.repo]
[updates-released]
name=Fedora Core $releasever - $basearch - Released Updates
baseurl=http://==fedora_mirror==/updates/$releasever/$basearch/
enabled=1
gpgcheck=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora

[fedora-extras.repo]
[extras]
name=Fedora Extras $releasever - $basearch
baseurl=http://==fedora_mirror==/extras/$releasever/$basearch/
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-extras

gpgcheck=1

== Download & Install fedora-release-xxxxxx.rpm ==

Download from the mirror this file: $relverstion/i386/os/Fedora/RPMS/fedora-release-xxxxxx.rpm

Then install it: rpm -ivh fedora-release-xxxxxx.rpm

== Upgrade the system ==

Upgrade the system using YUM:

# yum update

‘'’Do not use yum -y on customer machines. It is higly posible to brake a package during the upgrade.”‘