订阅插件提示：This system is not registered with an entitlement server. You can use subscription-manager to

问题描述

[root@ecs-t6-medium-2-linux-20190910000110 /]# yum install -y epel-release
已加载插件：fastestmirror, product-id, search-disabled-repos, subscription-manager

This system is not registered with an entitlement server. You can use subscription-manager to register.

Determining fastest mirrors
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; 未知的错误"
Could not get metalink https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=x86_64&infra=stock&content=centos error was
14: curl#6 - "Could not resolve host: mirrors.fedoraproject.org; 未知的错误"

解决办法

这个Red Hat Subscription Manager订阅管理器，它会让你一直register，禁用就好。
脚本文件: /usr/lib/yum-plugins/subscription-manager.py
配置文件: /etc/yum/pluginconf.d/subscription-manager.conf
调用了脚本 /usr/share/rhsm/repolib.py
去重写或者更新/etc/yum.repos.d/redhat.repo文件。
每次yum调用(不禁掉plugins的情况下)，都会更新此文件。
因此，为了不冲突，可以如下操作:停止掉该插件的使用，在配置文件中把enable=0即可。

[root@ecs-t6-medium-2-linux-20190910000110 /]# vim /etc/yum/pluginconf.d/subscription-manager.conf
[main]
enabled=0           #将它禁用掉