解析Linux下Varnish缓存的配置优化

backend linuxidc01 {
      .host = "192.168.1.142";
      .port = "7070";
      .probe = {
      .timeout = 5s;        
      .interval = 2s;         
      .window = 10;        
      .threshold = 8;    
      }
   }
backend linuxidc02 {
      .host = "192.168.1.141";
      .port = "7070";
      .probe = {
      .timeout = 5s;
      .interval = 2s;
      .window = 10;
      .threshold = 8;
      }
   }

director linuxidc15474 random
        { .retries = 6;
            { .backend = linuxidc02;
              .weight = 2;
             }
            { .backend = linuxidc01;
               .weight = 2;
            }
        }

acl local  {
         "localhost";
         "127.0.0.1";
          }

sub vcl_recv
{
       if (req.http.host ~ "^linuxidc15474.vicp.net")  #匹配域名跳转后台服务器
            { set req.backend = linuxidc15474; }
         else { error 404 "Unknown HostName!"; }
        if (req.request == "PURGE")    #不允许非访问控制列表内的IP清除varnish缓存
             { if (!client.ip ~ local)
                 {
                  error 405 "Not Allowed."; 
                  return (lookup);  
                 }
             }
        #清除url中有jpg等文件的cookie
        if (req.request == "GET" && req.url ~ "\.(jpg|png|gif|swf|jpeg|ico)$")
            {
              unset req.http.cookie;
             }  
        #判断req.http.X-Forwarded-For 如果前端有多重反向代理，这样可以获取客户端IP地址。
        if (req.http.x-forwarded-for)
           {
              set req.http.X-Forwarded-For = req.http.X-Forwarded-For ", " client.ip;
           }
        else { set req.http.X-Forwarded-For = client.ip; }
##varnish实现图片的防盗链
#        if (req.http.referer ~ "http://.*)
#          {
#             if ( !(req.http.referer ~ "http://.*vicp\.net" ||
#                   req.http.referer ~ "http://.*linuxidc15474\.net" ) )
#                 {
#                   set req.http.host = "linuxidc15474.vicp.net";
#                   set req.url = "/referer.jpg";
#                 }
#              return(lookup);
#          }
#         else {return(pass);}
       if (req.request != "GET" &&
           req.request != "HEAD" &&
           req.request != "PUT" &&
           req.request != "POST" &&
           req.request != "TRACE" &&
           req.request != "OPTIONS" &&
           req.request != "DELETE")
        { return (pipe); }
        #对非GET|HEAD请求的直接转发给后端服务器
        if (req.request != "GET" && req.request != "HEAD")
            { return (pass); }
        ##对GET请求，且url里以.php和.php?结尾的，直接转发给后端服务器
        if (req.request == "GET" && req.url ~ "\.(php)($|\?)")
            { return (pass); }
        ##对请求中有验证及cookie，直接转发给后端服务器
        if (req.http.Authorization || req.http.Cookie)
            { return (pass);}
         {
           ##除以上的访问请求，从缓存中查找
           return (lookup);
         }
       ##指定的font目录不进行缓存
       if (req.url ~ "^/fonts/")
           { return (pass); }
}
sub vcl_pipe
            { return (pipe); }
##进入pass模式，请求被送往后端，后端返回数据给客户端，但不进入缓存处理
sub vcl_pass
            { return (pass); }
sub vcl_hash
      {
          set req.hash += req.url;
        if (req.http.host)
           { set req.hash += req.http.host; }
        else { set req.hash += server.ip; }
      return (hash);
      }
##在lookup后如果在cache中找到请求的缓存，一般以下面几个关键词结束
sub vcl_hit
          {
              if (!obj.cacheable)
                { return (pass); }
               return (deliver);
          }
##lookup后没有找到缓存时调用，以下面几个关键词结束，及调用fetch参数重新测试是否加入缓存
sub vcl_miss
     { return (fetch); }
#让varnish服务器缓存的类型，从后端取得数据后调用
sub vcl_fetch
  {    if (!beresp.cacheable)
            { return (pass); }
        if (beresp.http.Set-Cookie)
           { return (pass); }
       ##WEB服务器指明不缓存的内容，varnish服务器不缓存
       if (beresp.http.Pragma ~ "no-cache" || beresp.http.Cache-Control ~ "no-cache" || beresp.http.Cache-Control ~ "private")
          { return (pass); }
       ##对访问中get有包含jpg,png等格式的文件进行缓存，缓存时间为7天，s为秒
      if (req.request == "GET" && req.url ~ "\.(js|css|mp3|jpg|png|gif|swf|jpeg|ico)$")
         { set beresp.ttl = 7d; }
      ##对访问get中包含htm等静态页面，缓存300秒
      if (req.request == "GET" && req.url ~ "\/[0-9]\.htm$")
         { set beresp.ttl = 300s; }
           return (deliver);
   }
####添加在页面head头信息中查看缓存命中情况########
sub vcl_deliver
 {
       set resp.http.x-hits = obj.hits ;
       if (obj.hits > 0)
              { set resp.http.X-Cache = "HIT cqtel-bbs"; }
       else { set resp.http.X-Cache = "MISS cqtel-bbs"; }
  }

<?php  
function purge($ip, $url)  
{  
    $errstr = '';  
    $errno = '';  
    $fp = fsockopen ($ip, 80, $errno, $errstr, 2);  
    if (!$fp)  
    {  
         return false;  
    }  
    else 
    {  
        $out = "PURGE $url HTTP/1.1\r\n";  
        $out .= "Host:blog.s135.com\r\n";  
        $out .= "Connection: close\r\n\r\n";  
        fputs ($fp, $out);  
        $out = fgets($fp , 4096);  
        fclose ($fp);  
        return true;  
    }  
}  

purge("192.168.0.4", "/index.php");  
?>