nignx的proxy_cache缓存配置

nginx的proxy_cache配置，启用缓存功能，这里给出nginx.conf的配置内容。转载自:http://blog.s135.com/nginx_cache/

ign

user  www www;
worker_processes 8;
error_log  /usr/local/webserver/nginx/logs/nginx_error.log  crit;
pid        /usr/local/webserver/nginx/nginx.pid;
#Specifies the value for maximum file descriptors that can be opened by this process.
worker_rlimit_nofile 65535;
events
{
  use epoll;
  worker_connections 65535;
}
http
{
  include       mime.types;
  default_type  application/octet-stream;
  charset  utf-8;
             
  server_names_hash_bucket_size 128;
  client_header_buffer_size 32k;
  large_client_header_buffers 4 32k;
  client_max_body_size 300m;
             
  sendfile on;
  tcp_nopush     on;
  keepalive_timeout 60;
  tcp_nodelay on;
  client_body_buffer_size  512k;
  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;
  gzip on;
  gzip_min_length  1k;
  gzip_buffers     4 16k;
  gzip_http_version 1.1;
  gzip_comp_level 2;
  gzip_types       text/plain application/x-javascript text/css application/xml;
  gzip_vary on;
  #注：proxy_temp_path和proxy_cache_path指定的路径必须在同一分区
  proxy_temp_path   /data0/proxy_temp_dir;
  #设置Web缓存区名称为cache_one，内存缓存空间大小为200MB，1天没有被访问的内容自动清除，硬盘缓存空间大小为30GB。
  proxy_cache_path  /data0/proxy_cache_dir  levels=1:2   keys_zone=cache_one:200m inactive=1d max_size=30g;
         
  upstream backend_server {
    server   192.168.8.43:80 weight=1 max_fails=2 fail_timeout=30s;
    server   192.168.8.44:80 weight=1 max_fails=2 fail_timeout=30s;
    server   192.168.8.45:80 weight=1 max_fails=2 fail_timeout=30s;
  }
  server
  {
    listen       80;
    server_name  www.yourdomain.com 192.168.8.42;
    index index.html index.htm;
    root  /data0/htdocs/www; 
    location /
    {
         #如果后端的服务器返回502、504、执行超时等错误，自动将请求转发到upstream负载均衡池中的另一台服务器，实现故障转移。
         proxy_next_upstream http_502 http_504 error timeout invalid_header;
         proxy_cache cache_one;
         #对不同的HTTP状态码设置不同的缓存时间
         proxy_cache_valid  200 304 12h;
         #以域名、URI、参数组合成Web缓存的Key值，Nginx根据Key值哈希，存储缓存内容到二级缓存目录内
         proxy_cache_key $host$uri$is_args$args;
         proxy_set_header Host  $host;
         proxy_set_header X-Forwarded-For  $remote_addr;
         proxy_pass http://backend_server;
         expires      1d;
    }
           
    #用于清除缓存，假设一个URL为http://192.168.8.42/test.txt，通过访问http://192.168.8.42/purge/test.txt就可以清除该URL的缓存。
    location ~ /purge(/.*)
    {
     #设置只允许指定的IP或IP段才可以清除URL缓存。
     allow            127.0.0.1;
     allow            192.168.0.0/16;
     deny            all;
     proxy_cache_purge    cache_one   $host$1$is_args$args;
    }   
    #扩展名以.php、.jsp、.cgi结尾的动态应用程序不缓存。
    location ~ .*\.(php|jsp|cgi)?$
    {
         proxy_set_header Host  $host;
         proxy_set_header X-Forwarded-For  $remote_addr;
         proxy_pass http://backend_server;
    }
    access_log  off;
  }
}