修改centos的yum源为国内的源

 
 1、安装Centos后默认的Yum源如下 

 
  ll /etc/yum.repos.d/ 

 
   [root@localhost ~]# ll /etc/yum.repos.d/ 
  
   total 32 
  
   -rw-r--r--. 1 root root 1664 Nov 23 21:16 CentOS-Base.repo 
  
   -rw-r--r--. 1 root root 1309 Nov 23 21:16 CentOS-CR.repo 
  
   -rw-r--r--. 1 root root 649 Nov 23 21:16 CentOS-Debuginfo.repo 
  
   -rw-r--r--. 1 root root 314 Nov 23 21:16 CentOS-fasttrack.repo 
  
   -rw-r--r--. 1 root root 630 Nov 23 21:16 CentOS-Media.repo 
  
   -rw-r--r--. 1 root root 1331 Nov 23 21:16 CentOS-Sources.repo 
  
   -rw-r--r--. 1 root root 5701 Nov 23 21:16 CentOS-Vault.repo

 
  2、把默认Yum源备份(可选) 
 
   [root@localhost ~]# mkdir /opt/centos-yum.bak 
  
   [root@localhost ~]# mv /etc/yum.repos.d/* /opt/centos-yum.bak/

 
  3、下载163 Yum源repo文件 
 
  163源：(http://mirrors.163.com/.help/centos.html)--官方地址 
 
   #各系统版本repo文件对应的下载操作 
  
   CentOS 6 
  
   wget -O /etc/yum.repos.d/CentOS6-Base-163.repo http://mirrors.163.com/.help/CentOS6-Base-163.repo 
  
   CentOS 7 
  
   wget -O /etc/yum.repos.d/CentOS7-Base-163.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo

 
  阿里云的源：（https://opsx.alibaba.com/mirror）--官方地址 
 
   CentOS 6 
  
   wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo 
  
   或者 
  
   curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo 
  
   CentOS 7 
  
   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

 
  查看系统对应版本 
 
   [root@localhost ~]# cat /etc/redhat-release 
  
   CentOS Linux release 7.6.1810 (Core)

 
  下载对应的源文件： 
 
   [root@localhost ~]# wget -O /etc/yum.repos.d/CentOS7-Base-163.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo 
  
   --2019-05-18 18:40:02-- http://mirrors.163.com/.help/CentOS7-Base-163.repo 
  
   Resolving mirrors.163.com (mirrors.163.com)... 59.111.0.251 
  
   Connecting to mirrors.163.com (mirrors.163.com)|59.111.0.251|:80... connected. 
  
   HTTP request sent, awaiting response... 200 OK 
  
   Length: 1572 (1.5K) [application/octet-stream] 
  
   Saving to: ‘/etc/yum.repos.d/CentOS7-Base-163.repo’ 
  
   100%[==============================================================================================================================>] 1,572 --.-K/s in 0s 
  
   2019-05-18 18:40:02 (186 MB/s) - ‘/etc/yum.repos.d/CentOS7-Base-163.repo’ saved [1572/1572]

 
  清除缓存 
 
  # yum clean all 
 
  # yum makecache 　　　　把Yum源缓存到本地，加快软件的搜索好安装速度 
 
  # yum list 　　　　　　　　列出了yum包 
 
  # yum repolist

修改centos的yum源为国内的源

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