配置阿里云YUM源: 1,备份 #cd /etc/yum.repo.d/ #mkdir repos #mv *.repo repos 2,下载 #wget wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

3,#yum install -y epel-release.noarch 按装epel扩展源 4,之后运行yum makecache生成缓存