redhat7 yum源

[root@localhost ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

[root@localhost ~]# sed -i ‘s/$releasever/7/g’ /etc/yum.repos.d/CentOS-Base.repo

[root@localhost ~]# yum clean all

[root@localhost ~]# yum list