LNMP時，出現502 Bad Gateway的錯誤提示
因為工作需要，要在ubuntu中安裝LNMP環境，在這裡，php是最新版本php7.1。一切都進展得很順利，安裝完成後，在瀏覽器中輸入http://127.0.0.1/info.php，出現了502 Bad Gateway的錯誤提示。
開啟/var/log/nginx 下的error.log，發現提示為：2017/07/15 14:46:47 [error] 1228#0: *8 connect() failed (111: Connection refused) while connecting to upstream, client: 127.0.0.1, server: localhost, request: "GET /info.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "127.0.0.1"。
進入/etc/php/7.1/fpm/pool.d下，開啟www.conf檔案，找到listen這一行，發現listen = /run/php/php7.1-fpm.sock。(我的php7.1-fpm.sock 在/var/run/php/php7.1-fpm.sock下，於是改成了/var/run/php/php7.1-fpm.sock)
進入/etc/nginx/sites-available目錄下，開啟default檔案，裡面的location配置為：
location ~ \.php$ {
# fastcgi_split_path_info ^(.+\.php)(/.+)$;
# # NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
#
# # With php5-cgi alone:
fastcgi_pass 127.0.0.1:9000;
# # With php5-fpm:
# fastcgi_pass unix:/var/run/php/php7.1-fpm.sock;
# include fastcgi_params;
# fastcgi_index index.php;
# include fastcgi_params;
#}
# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
}
很明顯，default檔案中的l監聽方式和www.conf檔案中的不一樣，因此我改為：
location ~ \.php$ {
# fastcgi_split_path_info ^(.+\.php)(/.+)$;
# # NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
#
# # With php5-cgi alone:
# fastcgi_pass 127.0.0.1:9000;
# # With php5-fpm:
fastcgi_pass unix:/var/run/php/php7.1-fpm.sock;
fastcgi_split_path_info ^(.+\.php)(/.*)$;
include fastcgi_params;
fastcgi_index index.php;
include fastcgi_params;
#}
# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
}
最終default檔案如下：
儲存這個配置後，重啟Nginx ;service nginx restart,然後重新整理瀏覽器，最後的結果展示如下：
問題得到了解決！