下载镜像
docker pull registry.access.redhat.com/rhel7:7.6
修改yum源
1. 安装wget
1.1 wget下载地址：http://mirrors.163.com/centos/7/os/x86_64/Packages/wget-1.14-18.el7_6.1.x86_64.rpm
2.2 命令：rpm -ivh wget-1.14-18.el7_6.1.x86_64.rpm
2. 下载yum必须的rpm文件
2.1 创建目录
cd /usr/local
mkdir soft
cd soft
#### 2.2 下载rpm文件
wget https://vault.centos.org/7.3.1611/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
wget https://vault.centos.org/7.3.1611/os/x86_64/Packages/python-urlgrabber-3.10-8.el7.noarch.rpm
wget https://vault.centos.org/7.3.1611/os/x86_64/Packages/yum-3.4.3-150.el7.centos.noarch.rpm
wget https://vault.centos.org/7.3.1611/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget https://vault.centos.org/7.3.1611/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-40.el7.noarch.rpm
3. 卸载系统自带的yum相关安装
3.1 查看原来是否安装yum： rpm -qa | grep yum
3.2 直接卸载自带的yum： rpm -qa|grep yum|xargs rpm -e --nodeps
3.3 查看是否卸载干净： rpm -qa |grep yum
4. 安装centos源yum
rpm -ivh python-iniparse-0.4-9.el7.noarch.rpm
rpm -ivh python-urlgrabber-3.10-8.el7.noarch.rpm
rpm -ivh yum-3.4.3-150.el7.centos.noarch.rpm --force --nodeps
rpm -ivh yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
rpm -ivh yum-plugin-fastestmirror-1.1.31-40.el7.noarch.rpm --force --nodeps
5. 设置yum源
5.1 进入/etc/yum.repos.d/目录
5.2 删除目录下的所有文件
5.3 下载yum源
wget http://mirrors.aliyun.com/repo/Centos-7.repo
5.4 打开下载的文件并编辑，将$release 全部替换成7
vi Centos-7.repo
:%s/$release/7/g
5.5 清楚缓存
yum clean all
5.6 建立缓存
yum makecache
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