fedora和centos安装了fastermirror之后会快一些，但是还是经常选到国外的站点。

方法1：修改源配置文件（推荐，以fedora20为例）

sudo vim fedora.repo
# 找到以下这行
metalink=https://mirrors.fedoraproject.org/metalink?repo=fedora-$releasever&arch=$basearch
# 后面添加&country=cn
metalink=https://mirrors.fedoraproject.org/metalink?repo=fedora-$releasever&arch=$basearch&country=cn
sudo vim fedora-updates.repo
# 找到以下这行
metalink=https://mirrors.fedoraproject.org/metalink?repo=updates-released-f$releasever&arch=$basearch
# 后面添加&country=cn
metalink=https://mirrors.fedoraproject.org/metalink?repo=updates-released-f$releasever&arch=$basearch&country=cn

方法2：修改fastestmirror.conf

sudo vim /etc/yum/pluginconf.d/fastestmirror.conf

修改后清除fastestmirror和metalink缓存

sudo yum clean metadata plugins
sudo yum -y update