nginx 503 Service Temporarily Unavailable錯誤如何解決

最近網站刷新後常出現503 service temporarily unavailable錯誤，有時有可以，聯想到最近在nginx.conf裡做了單ip訪問次數限制，(limit_req_zone $binary_remote_addr zone=allips:20m rate=20r/s; ) 把這個數量放大後在刷新發現問題解決。 （還順便把這個改大了 limit_req zone=allips burst=50 nodelay;   ）為了證實這個問題，反覆改動該數量測試發現問題確實在這裡。這個數量設得太小有問題，透過fiddler發現web頁面刷新一下，因為頁面上引用的js,css,圖片都算一個連接。所以單一頁面刷新下就有可能刷爆這個限制，超過這個限制就會提示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;
   #roft html;
   #index index.html index.htm;
    }
  }

  服务器{
    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共享：ssl：1m;
  #ssl_session_timeout 5m;

  #ssl_ciphers high：！anull：！md5;
  #ssl_prefer_server_ciphers on;

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

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