How to build local yum source and online yum source

1. Build a local yum source

The company's internal network builds a server, and usually cannot connect to the external network, resulting in the yum installation tool in CentOS cannot be used; installing software using the rpm package has to deal with various dependencies, which is very troublesome. We can solve this problem by building a local yum source

mount /dev/cdrom /mnt/		    	#把光盘挂载到/mnt目录下
cd /etc/yum.repos.d/                
mkdir repos.bak                     #创建一个备份目录
mv *.repo repos.bak                 #将目录下的文件移到到备份目录中

vim local.repo
[local]						    	#仓库类别
name=local						    #仓库名称
baseurl=file:///mnt			    	#指定URL 访问路径为光盘挂载目录
enabled=1					     	#开启此yum源，此为默认项，可省略
gpgcheck=0						    #不验证软件包的签名

yum clean all && yum makecache		# 删除yum缓存并更新

Two, build online yum source

Here we need the system to be able to connect to the external network.
We choose Alibaba Cloud Mirror as the online source

wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo