准备材料：
- 1, CentOS-7-x86_64-DVD-1810.iso
- 2, 安装 httpd
- 3,重新编辑 /etc/yum.repos.d/CentOS-Base.repo
- 4, 使用新的仓库地址： yum clean all && yum makecache && yum list
1，下载centos7软件集成镜像
https://mirrors.tuna.tsinghua.edu.cn/centos/7.6.1810/isos/x86_64/CentOS-7-x86_64-DVD-1810.iso
2，安装httpd服务
（ 使用http提供本地网络访问资源文件）
[[email protected] yum.repos.d]# yum -y install httpd && service httpd start
[[email protected] yum.repos.d]# lsof -i:80
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
httpd 14456 root 4u IPv6 43691 0t0 TCP *:http (LISTEN)
httpd 14457 apache 4u IPv6 43691 0t0 TCP *:http (LISTEN)
httpd 14458 apache 4u IPv6 43691 0t0 TCP *:http (LISTEN)
httpd 14459 apache 4u IPv6 43691 0t0 TCP *:http (LISTEN)
httpd 14460 apache 4u IPv6 43691 0t0 TCP *:http (LISTEN)
httpd 14461 apache 4u IPv6 43691 0t0 TCP *:http (LISTEN)
httpd 14462 apache 4u IPv6 43691 0t0 TCP *:http (LISTEN)
httpd 14463 apache 4u IPv6 43691 0t0 TCP *:http (LISTEN)
httpd 14466 apache 4u IPv6 43691 0t0 TCP *:http (LISTEN)
httpd 14467 apache 4u IPv6 43691 0t0 TCP *:http (LISTEN)
httpd 14468 apache 4u IPv6 43691 0t0 TCP *:http (LISTEN)
3, 挂载iso文件到http的访问目录
#http配置文件： /etc/httpd/conf/httpd.conf
# DocumentRoot "/var/www/html"
[[email protected] ~]# mkdir /var/www/html/centos7/
[[email protected] yum.repos.d]# mount ~/CentOS-7-x86_64-DVD-1810.iso /var/www/html/centos7/
4, 重新编辑repo文件
[[email protected] yum.repos.d]#mkdir back
[[email protected] yum.repos.d]# mv *.repo back
#编辑新的Centos-Base.repo文件，内容如下
[[email protected] yum.repos.d]# cat CentOS-Base.repo
[base]
name=myrepo
baseurl=http://s101:80/centos7/
enabled=1
gpgcheck=0
gpgkey=http://s101:80/centos7/RPM-GPG-KEY-CentOS-7
5，创建仓库缓存
[[email protected] yum.repos.d]# yum clean all
[[email protected] yum.repos.d]# yum makecache