问题

LZ今天在用yum给虚拟机安装FTP服务时发现yum无法正常使用，问题如下：

[root@hadoop ~]# yum install vsftpd
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
 * base: centos.ustc.edu.cn
 * extras: centos.ustc.edu.cn
 * updates: centos.ustc.edu.cn
http://centos.ustc.edu.cn/centos/6.8/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
http://ftp.sjtu.edu.cn/centos/6.8/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
http://mirror.lzu.edu.cn/centos/6.8/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.

2017-11-10_113036.png

很明显这样centOS的源更新了，未找到对应的源

解决（寻找对应centOS版本的源）

1、进入yum源配置目录

cd /etc/yum.repos.d

2、备份原来的yum源，便于恢复

mv CentOS-Base.repo CentOS-Base.repo.bk

2017-11-10_113445.png

注意：这里repo文件好几个，但是base最重要的，所以只需备份base即可

3、下载新的CentOS-Base.repo 到/etc/yum.repos.d/

//更新为阿里云的源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

//更新为163的源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS6-Base-163.repo

//更新为搜狐的源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.sohu.com/help/CentOS-Base-sohu.repo

2017-11-10_113755.png

4、运行yum makecache生成缓存

yum clean all
yum makecache

2017-11-10_113945.png