把默认的CentOS yum源修改成国内的163源

163官方教程：http://mirrors.163.com/.help/centos.html

1.安装Centos后默认的yum源如下

 [root@kangvcar ~]# ll /etc/yum.repos.d/ total 32 -rw-r--r--. 1 root root 1664 Dec 9 2015 CentOS-Base.repo -rw-r--r--. 1 root root 1309 Dec 9 2015 CentOS-CR.repo -rw-r--r--. 1 root root 649 Dec 9 2015 CentOS-Debuginfo.repo -rw-r--r--. 1 root root 290 Dec 9 2015 CentOS-fasttrack.repo -rw-r--r--. 1 root root 630 Dec 9 2015 CentOS-Media.repo -rw-r--r--. 1 root root 1331 Dec 9 2015 CentOS-Sources.repo -rw-r--r--. 1 root root 1952 Dec 9 2015 CentOS-Vault.repo

2.把默认yum源备份(可选)

 [root@kangvcar ~]# mkdir /opt/centos-yum.bak [root@kangvcar ~]# mv /etc/yum.repos.d/* /opt/centos-yum.bak/

3.下载163 yum源repo文件

 #各系统版本repo文件对应的下载操作 CentOS 5 wget -O /etc/yum.repos.d/CentOS5-Base-163.repo http://mirrors.163.com/.help/CentOS5-Base-163.repo 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

 [root@kangvcar ~]# cat /etc/redhat-release //查看系统的版本 CentOS Linux release 7.2.1511 (Core) [root@kangvcar ~]# wget -O /etc/yum.repos.d/CentOS7-Base-163.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo --2017-06-20 06:29:47-- http://mirrors.163.com/.help/CentOS7-Base-163.repo Resolving mirrors.163.com (mirrors.163.com)... 123.58.173.185, 123.58.173.186 Connecting to mirrors.163.com (mirrors.163.com)|123.58.173.185|: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 2017-06-20 06:29:47 (293 MB/s) - ‘/etc/yum.repos.d/CentOS7-Base-163.repo’ saved [1572/1572]

4.清除缓存

 [root@kangvcar ~]# yum clean all Loaded plugins: fastestmirror Cleaning repos: base extras updates Cleaning up everything Cleaning up list of fastest mirrors [root@kangvcar ~]# yum makecache //把yum源缓存到本地，加快软件的搜索好安装速度 [root@kangvcar ~]# yum list //总共列出了9951个包