502 Bad Gateway in Server

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502 Bad Gateway

The proxy server received an invalid response from an upstream server. Sorry for the inconvenience.
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Server: taocode-master
Date: 2017/03/27 15:18:16
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[mashirozx]

解析设置不当，查看 /var/log/nginx/error.log 的日志

以我遇到的情况为例

2018/03/10 19:53:56 [crit] 6979#0: *806 connect() to unix:/run/php/php7.1-fpm.sock failed (13: Permission denied) while connecting to upstream, client: 157.119.xxx.xx, server: xxx.com, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/run/php/php7.1-fpm.sock:", host: "view.2heng.xin", referrer: "https://xxx.com"

可见原因是 php-fpm 的 Permission denied，所以需要设置 nginx.conf 里的 user，将配置文件第一行

#user  nobody;

改为（www-data 是我的 php 设置）

user www-data;