环境：Ubuntu 9.10; squid监听173.26.100.214：80 ; varnish监听173.26.100.214:81
1.安装
*在http://sourceforge.net/projects/varnish/files/varnish/2.0.4/varnish-2.0.4.tar.gz下载varnish2.0.4.
*tar zxvf  varnish-2.0.4.tar.gz
*在解压后的varnish-2.0.4目录下，运行./autogen.sh
*./configure --prefix [指定的目录以下记为dir]  --enable-developer-warnings  --enable-debugging-symbols
*make
*make install
2.配置
创建cache目录：
mkdir -p /cache/varnish/V  && chown -R  777 /cache
编写启动脚本，下面是我的启动脚本：
#!/bin/sh
#file:start.sh
date -u
/usr/local/varnish/sbin/varnishd -a 173.26.100.214:81  -s file,/cache/varnish/V,1024m  -f /usr/local/varnish/etc/varnish/default.vcl  -p thread_pool_max=1500  -p thread_pools=5  -p listen_depth=512  -p client_http11=on
在dir/etc/varnish/default.vcl下修改配置，下面是我配置的一部分：

backend default {
.host = "173.26.100.214";
.port = "80";
}     /*squid做后端*/
sub vcl_recv {
    if (req.request != "GET" &&
      req.request != "HEAD" &&
      req.request != "PUT" &&
      req.request != "POST" &&
      req.request != "TRACE" &&
      req.request != "OPTIONS" &&
      req.request != "DELETE") {
        /* Non-RFC2616 or CONNECT which is weird. */
        return (pipe);
    }
    if (req.request != "GET" && req.request != "HEAD") {
        /* We only deal with GET and HEAD by default */
        return (pass);
    }
    if (req.http.Authorization || req.http.COOKIE) {
        /* Not cacheable by default */
        return (pass);
    }
    return (lookup);
}

sub vcl_pipe {
    return (pipe);
}

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);
}

sub vcl_hit {
    if (!obj.cacheable) {
        return (pass);
    }
    return (deliver);
}

sub vcl_miss {
    return (fetch);
}

sub vcl_fetch {
    if (!obj.cacheable) {
        return (pass);
    }
    if (obj.http.Set-COOKIE) {
        return (pass);
    }
    set obj.prefetch =  -30s;
    return (deliver);
}

sub vcl_deliver {
    return (deliver);
}

sub vcl_discard {
    /* XXX: Do not redefine vcl_discard{}, it is not yet supported */
    return (discard);
}

sub vcl_prefetch {
    /* XXX: Do not redefine vcl_prefetch{}, it is not yet supported */
    return (fetch);
}

sub vcl_timeout {
    /* XXX: Do not redefine vcl_timeout{}, it is not yet supported */
    return (discard);
}

sub vcl_error {
    set obj.http.Content-Type = "text/html; charset=utf-8";
    synthetic {"

 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

  
    
  
  
    
Error "} obj.status " " obj.response {"

    
"} obj.response {"

    
Guru Meditation:

    
XID: "} req.xid {"

    

       Varnish
    

  

"};
    return (deliver);
}

经测试，varnish做代理的访问速度比squid最快大10倍多