环境：Centos6.5
行为：安装nginx
问题：
nginx: [emerg] socket() [::]:80 failed (97: Address family not supported by protocol) nginx: configuration file /etc/nginx/nginx.conf test failed
解决：
vim /etc/nginx/conf.d/default.conf 将： listen 80 default_server; listen [::]:80 default_server; 改为： listen 80; #listen [::]:80 default_server;
启动nginx就行了。。
来自：http://www.liguosong.com/2016/11/14/nginx-emerg-socket-80-failed-97-address-family-not-supported-by-protocol/
nginx: [emerg] socket() [::]:80 failed (97: Address family not supported by protocol)
原文：http://www.cnblogs.com/jxkshu/p/6290484.html