Centos7 CM cluster configuration of yum, vim and other issues can not be used

Modify yum sources:
1) mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
visit: https: //mirrors.ustc.edu.cn /help/centos.html
the corresponding version of the content pasted into it.
2) VI /etc/yum.repos.d/CentOS-Base.repo
. 3) the sudo yum makecache (longer) when used
4. yum the install wget
5. The yum the install Vim
6. The Clients-yum the install OpenSSH

Reference blog

https://www.cnblogs.com/sunylat/p/7214753.html