1、在构建docker时，执行yum -y install gcc报一下错误
2、解决方案：更换镜像
执行以下指令：
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
3、再次执行yum -y install gcc
标签：gcc,repos,repo,Base,yum,install,报错 From： https://www.cnblogs.com/holly8/p/18315730