[root@king ~]# yum repolist
Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
base | 224 B 00:00
Error: requested datatype primary not available
步骤：
yum clean all
yum --rebuilddb
yum报错：Error: requested datatype primary not available
原文：http://13155409.blog.51cto.com/13145409/1959740