Home > PHP Framework > YII > body text

What to do if a 502 error occurs when deploying a yii project

藏色散人
Release: 2020-02-01 14:40:48
Original
2968 people have browsed it

What to do if a 502 error occurs when deploying a yii project

What should I do if a 502 error occurs when deploying a yii project?

Remember the troubleshooting of 502 bad gateway error when nginx deployed the yii2 project

I had nothing to do on Saturday, so I tried to install and deploy yii2. There was no problem during the installation process, but when deployed to nginx, I encountered a 502 bad gateway problem, which took a long time to solve. This problem is something I have not encountered before when deploying yii2, so I note it here for reference.

Recommended related article tutorials: yii tutorial

1, installation and deployment environment

Operating system: macOS, php version :5.6, nginx version: 1.10.1, yii2 version: 2.0.

2, installation of yii2

The installation of yii2 is very simple, just refer to the manual on the official website. What I installed here is yii2-app-advanced (Yii 2 Advanced Project Template). The project address is on github. Just follow the installation instructions in the README step by step. I won’t go into details about this.

3, Deployment of yii2 on nginx

In fact, the README of the yii2-app-advanced project has already stated very clearly how to deploy on nginx, follow the steps There shouldn't be any problem. But I was lazy during deployment and directly used the nginx deployment parameters in the README, which resulted in a 502 bad gateway error.

The response codes starting with 5 in the HTTP status code are all caused by the server side, so take a look at the nginx log:

error log:

What to do if a 502 error occurs when deploying a yii project

See upstream: "fastcgi: //127.0.0.1:9090" Here, the port seems wrong, so check the configuration of the virtual host:

What to do if a 502 error occurs when deploying a yii project

Look at the configuration of php-fpm again:

What to do if a 502 error occurs when deploying a yii project

Sure enough, it is the FastCGI server specified by the nginx virtual host The listening port is wrong, which will cause nginx to not get a response from the FastCGI server. So when the browser makes a request, nginx returns a 502 status code to the browser, telling the browser that the upstream FastCGI server has not responded.

4, Solution

In the nginx virtual host, modify the port specified by fastcgi_pass correctly, and this error will be solved.

5, Summary

(1) Errors starting with HTTP status code 5 are caused by the server side, while 502 bad gateway is caused by working as a gateway or proxy. The server (web server) received an invalid response from the upstream server (fastcgi server) when trying to perform the request.

(2) fastcgi_pass is a configuration directive of the ngx_http_fastcgi_module module. It specifies the address of the fastcgi server. Its description in the nginx document is as follows:

Syntax:    fastcgi_pass address;
Default:    —
Context:    location, if in location

Sets the address of a FastCGI server. The address can be specified as a domain name or IP address, and a port:
fastcgi_pass localhost:9000;

or as a UNIX-domain socket path:
fastcgi_pass unix:/tmp/fastcgi.socket;

If a domain name resolves to several addresses, all of them will be used in a round-robin fashion. In addition, an address can be specified as a server group.
Copy after login

The above is the detailed content of What to do if a 502 error occurs when deploying a yii project. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
yii
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template