https://www.linuxprobe.com/centos-install-iredmail.html
https://www.linuxprobe.com/centos-install-iredmail.html
cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak 备份原始的更新源 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo 下载并设置更新源为aliyun wget -P /etc/yum.repos.d/ http://mirrors.aliyun.com/repo/epel-7.repo 下载并设置EPEL源,此源中包含更多的软件 yum clean all 清理yum缓存 yum makecache 创建yum缓存