常见问题

1. Redhat7 yum源，解决 This system is not registered to Red Hat Subscription Management

   错误描述

   This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register. 
   

   解决方法

   • 删除redhat原有的yum

     $ rpm -aq|grep yum|xargs rpm -e --nodeps 
     

   • 下载yum安装文件，可以在此处查找

     $ wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-163.el7.centos.noarch.rpm
     $ wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
     $ wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-52.el7.noarch.rpm
     $ wget http://mirrors.163.com/centos/7/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
     

   • 安装yum

     $ rpm -ivh --force --nodeps python-iniparse-0.4-9.el7.noarch.rpm
     $ rpm -ivh --force --nodeps yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
     # 注意: 最后两个包必需同时安装，否则会相互依赖
     $ rpm -ivh --force --nodeps yum-3.4.3-163.el7.centos.noarch.rpm yum-plugin-fastestmirror-1.1.31-52.el7.noarch.rpm
     

   • 设置源

     $ wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
     

   • 清除原有缓存

     $ yum clean all
     

   • 重建缓存，以提高搜索安装软件的速度

     $ yum makecache
     
     # 如果有提示错误，运行下面的命令：[Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found" 
     $ sed -i 's/\$releasever/7/' CentOS-Base.repo
     
     # 备注：把文件里的$releasever替换为7 最后：重新生成缓存，数字不为0，就OK了
     $ yum clean all; yum makecache
     

   • 更新系统

     $ yum update