老师我按照你的方法去做yum -y install nginx时出现failure: repodata/repomd.xml from nginx-stable: [Errno 256] No more mirrors to try. http://nginx.org/packages/centos/7/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2001:1af8:ccbf:200::40eb:db5c: 网络不可达" ，其他的yum包也是出现这样的问题，删除nginx yum源配置文件就正常了。