安装wget

1	yum install wget

更换阿里源

cd /etc/yum.repos.d/
# 备份
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
cat CentOS-Base.repo
#更换阿里源
wget http://mirrors.aliyun.com/repo/Centos-altarch-7.repo -O /etc/yum.repos.d/CentOS-Base.repo
#查看是否更换成功
cat /etc/yum.repos.d/CentOS-Base.repo

更换成功后清除缓存并重建

1 2	yum clean all yum makecache

安装vim

1	yum install vim