CentOS7更改國內yum源

下面提供了 阿里和 清華大學 兩個鏡像倉庫配置操作說明，實際使用時，選擇其中一個配置即可，推薦使用清華大學的

1、配置 清華大學鏡像倉庫（推薦）

地址： https://mirrors.cnnic.cn/    你可以打開進去看看

（1）、首先備份 CentOS-Base.repo

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak

（2）、之後啓用 TUNA 軟件倉庫， 將清華大學鏡像倉庫信息寫入 /etc/yum.repos.d/CentOS-Base.repo

vim /etc/yum.repos.d/CentOS-Base.repo

將 CentOS-Base.repo 中的內容 更新爲 下面的內容：

# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#

[base]
name=CentOS-$releasever - Base
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/os/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/updates/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/extras/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/centosplus/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

（3）、清除緩存

yum clean all     # 清除系統所有的yum緩存
yum makecache     # 生成yum緩存

2、配置 阿里鏡像倉庫

進入阿里鏡像倉庫網站 https://opsx.alibaba.com/mirror/

根據官網的說明，我們詳細說說每步驟的意思。

（1）、備份：將 CentOS-Base.repo 爲CentOS-Base.repo.backup

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

（2）、下載新的 http://mirrors.aliyun.com/repo/Centos-7.repo,並命名爲CentOS-Base.repo

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
或者
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

（3）、清除緩存

yum clean all     # 清除系統所有的yum緩存
yum makecache     # 生成yum緩存