nginx配置后访问出现白屏的问题解决_Nginx

问题

服务器上有两个web服务ab分别指向3000、3001两个端口，使用nginx进行反向代理，配置文件如下：

server {
    listen 80;
    server_name www.example.com;
    
	location /a/ {
	    proxy_pass http://localhost:3000;
	    proxy_set_header host $host;
	    proxy_set_header x-real-ip $remote_addr;
	    proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;
	    proxy_set_header x-forwarded-proto $scheme;
	}
}

server {
    listen 80;
    server_name www.example.com;

    location /b/ {
        proxy_pass http://localhost:3001;
        proxy_set_header host $host;
        proxy_set_header x-real-ip $remote_addr;
        proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;
        proxy_set_header x-forwarded-proto $scheme;
    }
}

配置好后，重载：sudo systemctl reload nginx用浏览器访问：www.example.com/a/，浏览器是白屏，没有显示任何内容。

解决的思路：

1、查看日志：

`tail -n 10 /var/log/nginx/error.log`

显示内容如下：

[error] 1104804#1104804: *10 open()
“/usr/share/nginx/html/static/css/main.54631fc9.css” failed (2: no
such file or directory), client: 18.81.26.177, server:
www.example.com, request: “get /static/css/main.54631fc9.css
http/1.1”, host: “www.example.com”, referrer:
“http://www.example.com/a/”

2、分析

根据错误日志，nginx正在尝试在/usr/share/nginx/html/static/css/目录下查找main.54631fc9.css文件，但是没有找到。这是因为我的web应用在/a路径下寻找静态文件，但是nginx在默认的静态文件目录下查找。

3、查找

find / -name main.54631fc9.css

结果什么都没有找到

4、采用二级域名

配置文件调整如下：

server {
    listen 80;
    server_name a.example.com;

    location / {
        proxy_pass http://localhost:3000;
        proxy_set_header host $host;
        proxy_set_header x-real-ip $remote_addr;
        proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;
        proxy_set_header x-forwarded-proto $scheme;
    }
}

server {
    listen 80;
    server_name b.example.com;

    location / {
        proxy_pass http://localhost:3001;
        proxy_set_header host $host;
        proxy_set_header x-real-ip $remote_addr;
        proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;
        proxy_set_header x-forwarded-proto $scheme;
    }
}

重载nginx

在浏览器上b.example.com访问正常，但a.example.com显示nginx的欢迎页面，并未访问到正确的web页面。

5、再查日志

`tail -n 10 /var/log/nginx/error.log`

显示内容如下：

[error] 1106994#1106994: *780 open()
“/usr/share/nginx/html/favicon.ico” failed (2: no such file or
directory), client: 18.81.26.177, server: example.com, request: “get
/favicon.ico http/1.1”, host: “a.example.com”, referrer:
“http://a.example.com/”

6、再分析

根据错误日志中的提示信息，可以看到请求的是/favicon.ico文件，但是在/usr/share/nginx/html/目录下找不到该文件。因此，与该错误相关的语句是代理到a.example.com的location块中的proxy_pass语句。这条语句将请求代理到localhost:3000，而不是/usr/share/nginx/html/目录下的文件。

7、再查找

find / -name favicon.ico

找到/favicon.ico文件在以下目录：

 /usr/local/src/a/web/berry/public/favicon.ico 
 /usr/local/src/a/web/default/public/favicon.ico

8、添加多一个location

    location = /favicon.ico {
        alias /usr/local/src/a/web/berry/public/favicon.ico;
    }

a应用能正常访问了。

9、完整的配置文件

server {
    listen 80;
    server_name a.example.com;

    location = /favicon.ico {
        alias /usr/local/src/a/web/berry/public/favicon.ico;
    }

    location / {
        proxy_pass http://localhost:3000;
        proxy_set_header host $host;
        proxy_set_header x-real-ip $remote_addr;
        proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;
        proxy_set_header x-forwarded-proto $scheme;
    }
}

server {
    listen 80;
    server_name b.example.com;

    location / {
        proxy_pass http://localhost:3001;
        proxy_set_header host $host;
        proxy_set_header x-real-ip $remote_addr;
        proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;
        proxy_set_header x-forwarded-proto $scheme;
    }
}