503 Service Temporarily Unavailable 解决办法-nginx

503 Service Temporarily Unavailable 

最近网站刷新后经常出现503 Service Temporarily Unavailable错误，有时有可以，联想到最近在nginx.conf里做了单ip访问次数限制，(limit_req_zone $binary_remote_addr zone=allips:20m rate=20r/s;) 把这个数量放大后在刷新发现问题解决。（还顺便把这个改大了 limit_req zone=allips burst=50 nodelay;   ）为了证实该问题，反复改动该数量测试发现问题确实在这。这个数量设得太小有问题，通过fiddler发现web页面刷新一下，因为页面上引用的js,css,图片都算一个连接。所以单个页面刷新下就有可能刷爆这个限制，超过这个限制就会提示503 Service Temporarily Unavailable。

附上nginx.conf

#user  nobody;
worker_processes  1;
#worker_rlimit_nofile 100000; 
#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

##cache##
  proxy_connect_timeout 5;
  proxy_read_timeout 60;
  proxy_send_timeout 5;
  proxy_buffer_size 16k;
  proxy_buffers 4 64k;
  proxy_busy_buffers_size 128k;
  proxy_temp_file_write_size 128k;
  proxy_temp_path /home/temp_dir;
  proxy_cache_path /usr/local/nginx/cache levels=1:2 keys_zone=cache_one:200m inactive=1d max_size=30g;
  ##end##
#limit per ip per second access times 10 
limit_req_zone $binary_remote_addr zone=allips:20m rate=20r/s;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;
upstream myweb80{
   ip_hash;
   server 192.168.3.105:80;
   server 192.168.3.103:80;
}

upstream myweb8080{
   ip_hash;
   server 192.168.3.222:10080;
   #server 192.168.3.103:8080;
 } 
upstream myweb10086{
   ip_hash;
   server 192.168.3.102:10086;
   server 192.168.3.108:10086;
 } 
upstream myweb443{
   ip_hash;
   server 192.168.3.105:443;
   server 192.168.3.103:443;
 } 

    # another virtual host using mix of IP-, name-, and port-based configuration
    #
   server {
        listen       80;
        allow   218.17.158.2;
allow 127.0.0.0/24;
allow 192.168.0.0/16;
allow 58.251.130.1;
allow 183.239.167.3;
allow 61.145.164.1;
deny    all;
server_name  myweb.com;
        location / {
                proxy_pass http://myweb80;
proxy_set_header  X-Real-IP  $remote_addr;
limit_req zone=allips burst=50 nodelay;    
        }
    }

    server {
        listen       8080;
allow   218.17.158.2;
allow 127.0.0.0/24;
allow 192.168.0.0/16;
allow 58.251.130.1;
allow 183.239.167.3;
allow 61.145.164.1;
deny    all;
        location / {
                proxy_pass http://myweb8080;
proxy_set_header  X-Real-IP  $remote_addr;
limit_req zone=allips burst=50 nodelay;    
        }
    }

# HTTPS server
    #
    server {
        listen       10086 ssl;
        server_name  localhost;
allow   218.17.158.2;
allow 127.0.0.0/24;
allow 192.168.0.0/16;
allow 58.251.130.1;
allow 183.239.167.3;
allow 61.145.164.1;
#deny    all;
       ssl_certificate      ssl/1_www.myweb.com_bundle.crt;
        ssl_certificate_key  ssl/2_www.myweb.com.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

        location / {
     proxy_pass   https://myweb10086;
      #       root   html;
      #     index  index.html index.htm;
        }
    }

    server {
        listen       443 ssl;
        server_name  localhost;

       ssl_certificate      ssl/1_www.myweb.com_bundle.crt;
        ssl_certificate_key  ssl/2_www.myweb.com.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

        location / {
     proxy_pass   https://myweb443;
      #       root   html;
      #       root   html;
      #     index  index.html index.htm;
        }
    }
}