如何解决nginx 503 Service Temporarily Unavailable问题

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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;    #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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