实例学习nginx的cache功能

   #所需软件：
   wget http://labs.frickle.com/files/ngx_cache_purge-1.3.tar.gz
   pcre,nginx-0.8.29.tar.gz
   # purge模块
   http://labs.frickle.com/nginx_ngx_cache_purge/
  
   #安装
   tar -zxvf ngx_cache_purge-1.0.tar.gz
   tar -zxvf nginx-0.8.29.tar.gz
   cd nginx-0.8.29
   ./configure --user=www --group=www --add-module=../ngx_cache_purge-1.0
   --prefix=/usr/local/gp/nginx --with-http_stub_status_module
   --with-http_ssl_module
   make && make install

  mkdir -p /data0/proxy_temp_path
     mkdir -p /data0/proxy_cache_path

/data0/proxy_cache_path levels=1:2 keys_zone=cache_one:200m
     inactive=1d max_size=500m;
 

  # 日志格式设置命中状态有HIT,EXPIRED
     $upstream_cache_status
    # 据说先写到temp再移动到cache
    proxy_temp_path /data0/proxy_temp_path;
    proxy_cache_path /data0/proxy_cache_path levels=1:2 keys_zone=cache_one:200m
    inactive=10m max_size=500m;

    upstream my_server_pool {
      server 115.79.90.78:80;
    }
  
        server
    {
        listen 80;
        server_name file.51yuncai.com;
        location /
        {
         proxy_set_header Host $host;
         proxy_set_header X-Forwarded-For $remote_addr;
         proxy_pass http://my_server_pool;
        }

    # 设置缓存的文件类型,建议在后端设置缓存时间通过expires cache-control:max-age=[ses]
    location ~ .*.(gif|jpg|png|bmp|swf|js|css)$
        {
         proxy_cache cache_one;
       
     # 在cache端强制设置缓存时间
         proxy_cache_valid 200 304 12h;
         proxy_cache_valid 301 302 1m;
         proxy_cache_valid any 1m;

         proxy_cache_key $host$uri$is_args$args;

         #####
         add_header X-Cache $upstream_cache_status;
         proxy_set_header X-Forwarded-For $remote_addr;
         proxy_pass http://my_server_pool;
        }

        location ~ /purge(/.*)
         {
          allow 127.0.0.1;
          allow 192.168.1.0/24;
          deny all;
          proxy_cache_purge cache_one $host$1$is_args$args;
         }
      }

#!/bin/bash
    # author:gupeng
    # proxy_cache hit rate
    if [ "$1" != '' ];then
        if [ -e "$1" ];then
            HIT=`cat $1 | grep HIT | wc -l`
            ALL=`cat $1 | wc -l`
            Hit_rate=`echo "scale=2;($HIT/$ALL)*100" | bc`
            echo "Hit rate=$Hit_rate%"
        else
            echo "$1 not exsist!"
        fi
    else
        echo "usage: ./hit_rate.sh file_path"
    fi