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;

}

}

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。