[root@localhost hua]# yum makecache
Repository fedora is listed more than once in the configuration
Repository fedora-debuginfo is listed more than once in the configuration
Repository fedora-source is listed more than once in the configuration
Repository fedora is listed more than once in the configuration
Repository fedora-debuginfo is listed more than once in the configuration
Repository fedora-source is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository updates-debuginfo is listed more than once in the configuration
Repository updates-source is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository updates-debuginfo is listed more than once in the configuration
Repository updates-source is listed more than once in the configuration
同步仓库 'fedora' 缓存失败，禁用。
同步仓库 'updates' 缓存失败，禁用。

你是不是手动添加了其他的镜像源？建议删了，重新缓存。
不要用yum来操作，马上就要移除的东西，跟DNF会起冲突。