yum配置相关

当运行yum命令出现如下错误：
Cannot find a valid baseurl for repo: core
Error: Cannot find a valid baseurl for repo: core
则可以修改/etc/yum.resprepos.d/fedora-*.repo等文件中的baseaurl地址为一个合法的值，比如
[core]
name=Fedora Core $releasever - $basearch
#baseurl=http://download.fedora.redhat.com/pub/fedora/linux/core/$releasever/$basearch/os/
baseurl=http://centos.ustc.edu.cn/centos/5/os/i386/
mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=core-$releasever&arch=$basearch
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora file:///etc/pki/rpm-gpg/RPM-GPG-KE

[updates]
name=Fedora Core $releasever - $basearch - Updates
#baseurl=http://download.fedora.redhat.com/pub/fedora/linux/core/updates/$releasever/$basearch/
baseurl=http://centos.ustc.edu.cn/centos/5/os/i386/

[extras]
name=Fedora Extras $releasever - $basearch
#baseurl=http://download.fedora.redhat.com/pub/fedora/linux/extras/$releasever/$basearch/
baseurl=http://centos.ustc.edu.cn/centos/5/os/i386/
mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=extras-$releasever&arch=$basearch
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-extras
gpgcheck=1
保存之后，再运行yum update等命令就ok了。