红帽报错：This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
原因：Red Hat Subscription Manager订阅管理器未订阅注册
解决：禁用
配置文件:1. /etc/yum/pluginconf.d/subscription-manager.conf；2./etc/yum/pluginconf.d/product-id.conf；
# vim /etc/yum/pluginconf.d/subscription-manager.conf
# vim /etc/yum/pluginconf.d/product-id.conf
//在两个配置文件中将enabled=1均修改为enabed=0；
问题解决！