北郵的Fedora伺服器，
step 1 ： /etc/yum.repos.d文件夾下建立by.repo，寫入文章末尾的文字。
step 2 ： yum -help,看看怎麼能載入這個新的東西，而且還不要衝動的把整個系統升級。
step 3 ： 下面就是怎麼使用yum了(發現自己夠笨的)
[Fedora-by]
name=Fedora $releasever - $basearch
baseurl=ftp://ftp.bupt.edu.cn/pub/mirror/fedora/linux/releases/$releasever/Fedora/$basearch/os/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora file:///etc/pki/rpm-gpg/RPM-GPG-KEY
[Everything-by]
name=Everything $releasever - $basearch
baseurl=ftp://ftp.bupt.edu.cn/pub/mirror/fedora/linux/releases/$releasever/Everything/$basearch/os/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora file:///etc/pki/rpm-gpg/RPM-GPG-KEY
[updates-by]
name=Fedora updates
baseurl=ftp://ftp.bupt.edu.cn/pub/mirror/fedora/linux/updates/$releasever/$basearch/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora file:///etc/pki/rpm-gpg/RPM-GPG-KEY
[Development-by]
name=Fedora Development
baseurl=ftp://ftp.bupt.edu.cn/pub/mirror/fedora/linux/development/$basearch/
enabled=0
gpgcheck=0
[火星人
]
fedora9.0教育網源已經有319次圍觀
http://coctec.com/docs/linux/show-post-165310.html
