/************************************************************************************************
* nginx: [emerg] "fastcgi_pass" directive is duplicate in /etc/nginx/sites-enabled/default:57
* 说明：
* VPS安装Ubuntu 16.04，调一下Nginx的PHP Server。
*
* 2017-9-26 深圳 龙华樟坑村 曾剑锋
**********************************************************************************************/

一、参考文档：
1. 启动 nginx 失败 "fastcgi_pass" directive is duplicate
http://www.cnblogs.com/cgjcgs/p/5310031.html

二、错误现象：
root@localhost:/var/www/html# systemctl status nginx.service
鈼?[0m nginx.service - A high performance web server and a reverse proxy server
Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Tue 2017-09-26 01:45:11 EDT; 1min 20s ago
Process: 345 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=1/FAILURE)

Sep 26 01:45:11 localhost systemd[1]: Starting A high performance web server and a reverse proxy server...
Sep 26 01:45:11 localhost nginx[345]: nginx: [emerg] "fastcgi_pass" directive is duplicate in /etc/nginx/sites-enabled/default:57
Sep 26 01:45:11 localhost nginx[345]: nginx: configuration file /etc/nginx/nginx.conf test failed
Sep 26 01:45:11 localhost systemd[1]: nginx.service: Control process exited, code=exited status=1
Sep 26 01:45:11 localhost systemd[1]: Failed to start A high performance web server and a reverse proxy server.
Sep 26 01:45:11 localhost systemd[1]: nginx.service: Unit entered failed state.
Sep 26 01:45:11 localhost systemd[1]: nginx.service: Failed with result 'exit-code'.

三、解决办法：
1. 修改文件：/etc/nginx/sites-enabled/default
2. 如下：
location ~ \.php$ {
...
# fastcgi_pass 127.0.0.1:9000; （此处和下面重复，注释掉）
# # With php5-fpm:
fastcgi_pass unix:/var/run/php5-fpm.sock;（此处和上面重复）
...
}