[1] First backup
/etc/yum.repos.d/CentOS-Base.repo
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
[2] into the source yum configuration files folder
[root@localhost yum.repos.d]# cd /etc/yum.repos.d/
[3] 163 downloaded yum source profile, into /etc/yum.repos.d/
[root@localhost yum.repos.d]# wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
Please make the appropriate backup operation before
CentOS 5
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo
CentOS 6
wget -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
[4] generating the cache operation yum makecache
[root@localhost yum.repos.d]# yum makecache
[5] Update System
[root@localhost yum.repos.d]# yum -y update
[6] mounted vim editor
[root@localhost ~]# yum -y install vim*
/etc/yum.repos.d/CentOS-Base.repo
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
[2] into the source yum configuration files folder
[root@localhost yum.repos.d]# cd /etc/yum.repos.d/
[3] 163 downloaded yum source profile, into /etc/yum.repos.d/
[root@localhost yum.repos.d]# wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
Please make the appropriate backup operation before
CentOS 5
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo
CentOS 6
wget -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
[4] generating the cache operation yum makecache
[root@localhost yum.repos.d]# yum makecache
[5] Update System
[root@localhost yum.repos.d]# yum -y update
[6] mounted vim editor
[root@localhost ~]# yum -y install vim*