自建yum源就是使用自己本地的安装包来作为yum的源仓库。扩展 使用yum命令下载安装包以及依赖文件到本地。1.可以在yum命令安装的同时不清除安装包vim /etc/yum.confcachedir=/var/cache/yum/$basearch/$releasever//自定义安装包及依赖下载目录keepcache=0//1为启用，0不启用，把这里改为12.直接用命令下载包和依赖（不包括安装

Job for network.service failed because the control process exited with error code. See "systemctl status network.service" and "journalctl -xe" for details.