解决Nginx 502 bad gateway错误实例

我们在使用nginx的时候有不少问题出现，首先我们就来解决下nginx 502错误的问题

经 过分析将nginx的error log打开，发现”pstream sent too big header while reading response header from upstream”这样的错误提示，查阅了一下资料，大意是nginx缓冲区有一个bug造成的,我们网站的页面消耗占用缓冲区可能过大

我们是nginx反向代理

proxy是nginx作为client转发时使用的，如果header过大，超出了默认的1k，就会引发上述的upstream sent too big header （说白了就是nginx把外部请求给后端apache ，apache返回的header 太大nginx处理不过来就导致了。

server {

listen 80;

server_name www.server110.com ;

large_client_header_buffers 4 16k;

#charset koi8-r;

# access_log off;

location / {

#添加这3行 ，

proxy_buffer_size 64k;

proxy_buffers 32 32k;

proxy_busy_buffers_size 128k;

proxy_set_header Host $host;

proxy_set_header X-Real-IP $remote_addr;

proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

set $baiduspider '';

if ( $http_user_agent ~ Baiduspider) {

set $baiduspider Baidu;

}

............

如果是 nginx+PHPcgi 就该

fastcgi_connect_timeout 60;

fastcgi_send_timeout 180;

fastcgi_read_timeout 180;

fastcgi_buffer_size 128k;

fastcgi_buffers 4 256k;

fastcgi_busy_buffers_size 256k;

fastcgi_temp_file_write_size 256k;

fastcgi_intercept_errors on

011/01/07 11:12:57 [error] 10770#0: *38585340 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 116.22.131.154, server: www.server110.com, request: "GET /ysmp/index.php?did=124994 HTTP/1.0", upstream: "http://127.0.0.1:8080/ysmp/index.php?did=124994", host: "www.server110.com"

 

后来原来那错误没了出了新错误了 upstream timed out 超时？

server {

listen 80;

server_name www.server110.com;

large_client_header_buffers 4 16k;

client_max_body_size 300m;

client_body_buffer_size 128k;

proxy_connect_timeout 600;

proxy_read_timeout 600;

proxy_send_timeout 600;

proxy_buffer_size 64k;

proxy_buffers 4 32k;

proxy_busy_buffers_size 64k;

proxy_temp_file_write_size 64k;

#charset koi8-r;

# access_log off;

后来参数我又改了下 就好了。。。