Centos 7 替換鏡像源

1 備份原始源

[root@localhost ~]# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

2 下載新的鏡像源

• 方法1：wget直接下載
  執行命令：

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

  操做以下：

  [root@localhost yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
  --2018-02-09 05：54：04-- http://mirrors.aliyun.com/repo/Centos-7.repo
  正在解析主機 mirrors.aliyun.com (mirrors.aliyun.com)... 180.101.150.31, 180.101.150.28, 180.101.150.26, ...
  正在鏈接 mirrors.aliyun.com (mirrors.aliyun.com)|180.101.150.31|:80... 已鏈接。
  已發出 HTTP 請求，正在等待迴應... 200 OK
  長度：2573 (2.5K) [application/octet-stream]
  正在保存至: 「/etc/yum.repos.d/CentOS-Base.repo」

  100%[==============================================================================>] 2,573 --.-K/s 用時 0s

  2018-02-09 05：54：05 (281 MB/s) - 已保存 「/etc/yum.repos.d/CentOS-Base.repo」 [2573/2573])

• 方法2：curl直接下載
  執行命令：

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

  操做以下：

  [root@localhost yum.repos.d]# curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  100  2573  100  2573    0     0   8533      0 --：--：-- --：--：-- --：--：--  8548

• 方法3：在CentOS-Base.repo 寫入地址

  [root@localhost yum.repos.d]# vi CentOS-Base.repo
  [base]
  name=CentOS-$releasever - Base - mirrors.aliyun.com
  failovermethod=priority
  baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/
          http://mirrors.aliyuncs.com/centos/$releasever/os/$basearch/
  #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
  gpgcheck=1
  gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
  
  #released updates
  [updates]
  name=CentOS-$releasever - Updates - mirrors.aliyun.com
  failovermethod=priority
  baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
          http://mirrors.aliyuncs.com/centos/$releasever/updates/$basearch/
  #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
  gpgcheck=1
  gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
  
  #additional packages that may be useful
  [extras]
  name=CentOS-$releasever - Extras - mirrors.aliyun.com
  failovermethod=priority
  baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
          http://mirrors.aliyuncs.com/centos/$releasever/extras/$basearch/
  #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
  gpgcheck=1
  gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
  
  #additional packages that extend functionality of existing packages
  [centosplus]
  name=CentOS-$releasever - Plus - mirrors.aliyun.com
  failovermethod=priority
  baseurl=http://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/
          http://mirrors.aliyuncs.com/centos/$releasever/centosplus/$basearch/
  #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
  gpgcheck=1
  enabled=0
  gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
  
  #contrib - packages by Centos Users
  [contrib]
  name=CentOS-$releasever - Contrib - mirrors.aliyun.com
  failovermethod=priority
  baseurl=http://mirrors.aliyun.com/centos/$releasever/contrib/$basearch/
          http://mirrors.aliyuncs.com/centos/$releasever/contrib/$basearch/
  #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib
  gpgcheck=1
  enabled=0
  gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

3 更新緩存

[root@localhost yum.repos.d]# yum makecache
已加載插件：fastestmirror, langpacks
http://mirrors.aliyuncs.com/centos/7/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.aliyuncs.com/centos/7/os/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30000 milliseconds')正在嘗試其它鏡像。base                                                     | 3.6 kB  00：00：00extras                                                   | 3.4 kB  00：00：00updates                                                  | 3.4 kB  00：00：00(1/5): extras/7/x86_64/prestodelta                       | 102 kB  00：00：01(2/5): extras/7/x86_64/other_db                          | 108 kB  00：00：00(3/5): extras/7/x86_64/filelists_db                      | 636 kB  00：00：01(4/5): base/7/x86_64/other_db                            | 2.5 MB  00：00：02(5/5): base/7/x86_64/filelists_db                        | 6.7 MB  00：00：02Loading mirror speeds from cached hostfile * base: mirrors.aliyun.com * extras: mirrors.aliyun.com * updates: mirrors.aliyun.com元數據緩存已創建