Fedora安裝完畢之后最頭疼的問題就是軟件更新,因為Fedora默認的更新源服務器是在國外，所以每次更新的速度奇慢！那么，我們是否 可以修改Fedora的默認下載源呢？答案是可以的。目前國內有很多大學都提供了Fedora的更新包下載服務器，下載速度相對國外的快。下面以華中科技 大學的源（）為例(只能用在Fedora15、16、17，強烈建議在修改默認的下載源時候，先 備份/etc/yum.repos.d/fedora.repo和/etc/yum.repos.d/fedora-updates.repo。 比如：cp  /etc/yum.repos.d/fedora.repo 、/home/wyp/fedora.repo.bak)。

第一步：刪除/etc/yum.repos.d下的所以文件，上面談到了自己最好去備份，萬一自己弄錯了，可以恢復嘛。

rm -rf /etc/yum.repos.d/*   

第二步：將以下保存為 fedora-ustc.repo

[fedora]  
name=Fedora $releasever - $basearch - ustc  
failovermethod=priority  
baseurl=http://mirrors.ustc.edu.cn/fedora/linux/releases/$releasever/Everything/$basearch/os/  
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=fedora-$releasever&arch=$basearch  
enabled=1  
metadata_expire=7d  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$basearch  
   
[fedora-debuginfo]  
name=Fedora $releasever - $basearch - Debug - ustc  
failovermethod=priority  
baseurl=http://mirrors.ustc.edu.cn/fedora/linux/releases/$releasever/Everything/$basearch/debug/  
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=fedora-debug-$releasever&arch=$basearch  
enabled=0  
metadata_expire=7d  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$basearch  
   
[fedora-source]  
name=Fedora $releasever - Source - ustc  
failovermethod=priority  
baseurl=http://mirrors.ustc.edu.cn/fedora/linux/releases/$releasever/Everything/source/SRPMS/  
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=fedora-source-$releasever&arch=$basearch  
enabled=0  
metadata_expire=7d  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$basearch  

第三步：將以下保存為 fedora-updates-ustc.repo

[updates]  
name=Fedora $releasever - $basearch - Updates - ustc  
failovermethod=priority  
baseurl=http://mirrors.ustc.edu.cn/fedora/linux/updates/$releasever/$basearch/  
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=updates-released-f$releasever&arch=$basearch  
enabled=1  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$basearch  
   
[updates-debuginfo]  
name=Fedora $releasever - $basearch - Updates - Debug -ustc  
failovermethod=priority  
baseurl=http://mirrors.ustc.edu.cn/fedora/linux/updates/$releasever/$basearch/debug/  
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=updates-released-debug-f$releasever&arch=$basearch  
enabled=0  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$basearch  
   
[updates-source]  
name=Fedora $releasever - Updates Source - ustc  
failovermethod=priority  
baseurl=http://mirrors.ustc.edu.cn/fedora/linux/updates/$releasever/SRPMS/  
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=updates-released-source-f$releasever&arch=$basearch  
enabled=0  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$basearch  

第四步：將 fedora-ustc.repo和 fedora-updates-ustc.repo放入/etc/yum.repos.d/中
第五步：運行sudo yum clean all和sudo yum makecache（當然，你是root用戶就不要價sudo了）