yum 是Fedora中十分方便的軟件包管理工具，但是其默認的源全是國外的站點上的，極大地影響了其下載資源的速度；因此應將其改為國內的鏡像，清華大學的鏡像站就是教育網內比較完善的鏡像站點；建議教育網用戶將yum源改為清華大學的鏡像，極變態地提高下載速度。

具體操作如下（終端）：
1. 獲得root權限：
su
2. 將/etc/yum.repo.d改名；
mv /etc/yum.repo.d /etc/yum.repo.d~
若要還原該文件夾則輸入：
mv /etc/yum.repo.d~ /etc/yum.repo.d
3.編輯/etc/yum.conf文件：
gedit /etc/yum.conf
將其改為:

cachedir=/var/cache/yum
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
pkgpolicy=newest
distroverpkg=RedHat-release
tolerant=1
exactarch=1
obsoletes=1
gpgcheck=0
plugins=1
metadata_expire=1800

# PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d

[extras]
name=Extras
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/download.fedora.redhat.com/pub/fedora/linux/extras/$releasever/$basearch/
enabled=1

[extras-source]
name=Extras
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/download.fedora.redhat.com/pub/fedora/linux/extras/$releasever/SRPMS/
enabled=1

[extras-debug]
name=Extras-debug
baseurl=http://download.fedora.redhat.com/pub/fedora/linux/extras/$releasever/$basearch/debug/
enabled=0

[extras-development]
name=Extras-development
baseurl=http://download.fedora.redhat.com/pub/fedora/linux/extras/development/$basearch/
enabled=0

[extras-development-debug]
name=Extras-development-debug
baseurl=http://download.fedora.redhat.com/pub/fedora/linux/extras/development/$releasever/debug/
enabled=0

[extras-development-source]
name=Extras-development-source
baseurl=http://download.fedora.redhat.com/pub/fedora/linux/extras/development/SRPMS/
enabled=0

[updates]
name=Updates
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/download.fedora.redhat.com/pub/fedora/linux/core/updates/$releasever/$basearch
enabled=1

[updates-source]
name=Updates-source
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/download.fedora.redhat.com/pub/fedora/linux/core/updates/$releasever/SRPMS
enabled=1

[updates-testing]
name=Updates-testing
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/download.fedora.redhat.com/pub/fedora/linux/core/updates/testing/$releasever/$basearch
enabled=0

[updates-testing-debug]
name=Updates-testing-debug
baseurl=http://download.fedora.redhat.com/pub/fedora/linux/core/updates/testing/$releasever/$basearch/debug/
enabled=0

[updates-testing-source]
name=Updates-testing-source
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/download.fedora.redhat.com/pub/fedora/linux/core/updates/testing/$releasever/SRPMS
enabled=0

[core]
name=Core
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/download.fedora.redhat.com/pub/fedora/linux/core/$releasever/$basearch/os