yum执行命令报警yum install时提示This system is not registered with an entitlement server

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在一秒钟内看到本质的人和花半辈子也看不清一件事本质的人，自然是不一样的命运。

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因为使用redhat自带的yum源要付费，所以需要自己重新生成yum源。

1.Uninstall yum package

• 查询yum安装的包
  rpm -qa | grep yum
  

  

• 将安装包卸载(单个卸)
  sudo rpm -e xxxxx --nodeps
  

  

• 将安装包卸载(全卸) 我没执行成功
  rpm -qa|grep yum|xargs rpm -e --nodeps

• 下载安装CentOS的yum源
  如下几个网站均可，找到图片中的包进行下载
  1.阿里云网络源地址：https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/
  2.网易163网络源地址：http://mirrors.163.com/centos/7/os/x86_64/Packages/
  3.CentOS网络源地址：http://centos.ustc.edu.cn/centos/7/os/x86_64/Packages/
  

  

  
  

  

• 安装全部
  sudo rpm -ivh python-
  sudo rpm -ivh yum-

• 安装完检查一下
  rpm -qa | grep yum

• 安装某个 个别可能失败，有先后顺序
  sudo rpm -ivh xxxx
  

  

2.Yum Repo

• 下载yum源
  http://mirrors.163.com/.help/CentOS7-Base-163.repo
  http://mirrors.aliyun.com/repo/Centos-7.repo
• 修改配置
  cd /etc/yum.repo.d/
  vim CentOS-Base.repo =>没有就create，有则edit

# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the 
# remarked out baseurl= line instead.
#
#

[base]
name=CentOS-$releasever - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#released updates 
[updates]
name=CentOS-$releasever - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

• 上面的yum包都是7版本的
• 将所有的$releasever全部替换成版本号>7
  

  

• 进入编辑模式：
  %s/$releasever/7/g
• 保存
  :wq
• 清理缓存
  yum clean all
• 重新生成缓存
  yum makecache
• 查看仓库
  yum repolist all