Redhat使用yum install时提示This system is not registered with an entitlement server 的解决办法

[root@localhost ~]# yum install vsftpd -y
Loaded plugins: product-id, search-disabled-repos, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
Nothing to do

这是因为使用redhat自带的yum源要付费，所以需要自己重新生成yum源。

1、查询并卸载已经安装的redhatd的rpm包

[root@localhost ~]# rpm -qa |grep yum
yum-rhn-plugin-2.0.1-9.el7.noarch
yum-3.4.3-154.el7.noarch
yum-metadata-parser-1.1.4-10.el7.x86_64

[root@localhost ~]# rpm -e yum-rhn-plugin-2.0.1-9.el7.noarch --nodeps
[root@localhost ~]# rpm -e yum-3.4.3-154.el7.noarch --nodeps
[root@localhost ~]# rpm -e yum-metadata-parser-1.1.4-10.el7.x86_64 --nodeps

2、去163镜像站下载centos的rpm包，并安装

http://mirrors.163.com/centos/
 

wget http://mirrors.163.com/centos/7.6.1810/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
wget http://mirrors.163.com/centos/7.6.1810/os/x86_64/Packages/python-urlgrabber-3.10-9.el7.noarch.rpm
wget http://mirrors.163.com/centos/7.6.1810/os/x86_64/Packages/yum-3.4.3-161.el7.centos.noarch.rpm
wget http://mirrors.163.com/centos/7.6.1810/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget http://mirrors.163.com/centos/7.6.1810/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-50.el7.noarch.rpm

rpm -ivh python*.rpm
rpm -ivh yum*.rpm

3、下一步是重新编辑repo

curl http://mirrors.163.com/.help/CentOS7-Base-163.repo -o /etc/yum.repos.d/CentOS6-Base-163.repo
vim /etc/yum.repo/CentOS7-Base-163.repo

如果网络允许，可以baseurl可以使用外网地址，并使用全文替换：
:1,$s/$releasever/7
否则，可以本地挂载iso系统光盘

4、重建缓存并使用yum install 来进行测试是否yum源重建成功

清除缓存
[root@localhost yum.repos.d]# yum clean all
重建缓存，以提高搜索安装软件的速度
[root@localhost yum.repos.d]# yum makecache
更新系统（可选）
[root@localhost yum.repos.d]# yum update
测试yum安装：
[root@localhost yum.repos.d]# yum install vsftp

参考文档：

https://blog.csdn.net/indexman/article/details/79570577

http://www.dongcoder.com/detail-924283.html

https://blog.csdn.net/qq_15165093/article/details/79402580