配置阿里云YUM源:1,备份 #cd /etc/yum.repo.d/#mkdir repos#mv *.repo repos2,下载 #wget wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo缓存
3,#yum install -y epel-release.noarch 按装epel扩展源4,以后运行yum makecache生成缓存ide