进入到yum.repos.d
[root@localhost ~]# cd /etc/yum.repos.d/
将目录中的所有yum源移除,放到一个备份的文件夹中
[root@localhost yum.repos.d]# mkdir allblk [root@localhost yum.repos.d]# mv ./* allblk
下载yum源
[root@localhost yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo [root@localhost yum.repos.d]# wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
[root@localhost yum.repos.d]# ll total 8 drwxr-xr-x. 2 root root 187 Mar 6 16:17 allblk -rw-r--r--. 1 root root 2523 Jun 16 2018 CentOS-Base.repo -rw-r--r--. 1 root root 664 May 11 2018 epel.repo
清空之前的仓库缓存文件
[root@localhost yum.repos.d]# yum clean all