根据以上的配置增加集群，修改default.vcl

# This is a basic VCL configuration file for varnish.  See the vcl()

# man page for details on VCL syntax and semantics.

#

# Default backend definition.  Set this to point to your content

# server.

#

 backend b1 {

     .host = "127.0.0.1";

     .port = "";

     .connect_timeout = 1s;

     .first_byte_timeout = 5s;

     .between_bytes_timeout = 2s;

 }

 backend b2{

        .host = "127.0.0.1";

        .port = "";

        .connect_timeout = 1s;

        .first_byte_timeout = 5s;

        .between_bytes_timeout = 2s;

}

 director d1 random{

        .retries = ;

        {

                .backend = b1;

                .weight = ;

        }

        {

                .backend = b2;

                .weight = ;

        }

}

# ac1 purgeallow {

#       "127.0.0.1";

# }

#

# Below is a commented-out copy of the default VCL logic.  If you

# redefine any of these subroutines, the built-in logic will be

# appended to your code.

 sub vcl_recv {

        set req.backend=d1;

         if(req.request == "PURGE"){

                # if(!client.ip ~ purgeallow){

                #       error  "not allowed.";

                # }

                return(lookup);

         }

         if(req.request == "GET" && req.url ~ "\.(jpg|png|gif|swf|flv|ico|jpeg)$"){

        #       set req.backend=b1;

                unset req.http.cookie;

         }

         if(req.request == "GET" && req.url ~ "(?!)\.jsp($|\?)"){

        #       set req.backend=b2;

                return(pass);

         }

     if (req.restarts == ) {

                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;

                }

     }

     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 {

#     # Note that only the first request to the backend will have

#     # X-Forwarded-For set.  If you use X-Forwarded-For and want to

#     # have it set for all requests, make sure to have:

#     # set bereq.http.connection = "close";

#     # here.  It is not set by default as it might break some broken web

#     # applications, like IIS with NTLM authentication.

     return (pipe);

 }

#

 sub vcl_pass {

     return (pass);

 }

#

 sub vcl_hash {

     hash_data(req.url);

     if (req.http.host) {

         hash_data(req.http.host);

     } else {

         hash_data(server.ip);

     }

     return (hash);

 }

#

 sub vcl_hit {

     return (deliver);

 }

#

 sub vcl_miss {

     return (fetch);

 }

#

 sub vcl_fetch {

     if (beresp.ttl <= 0s ||

         beresp.http.Set-Cookie ||

         beresp.http.Vary == "*") {

#               /*

#                * Mark as "Hit-For-Pass" for the next 2 minutes

#                */

                set beresp.ttl =  s;

                return (hit_for_pass);

     }

     return (deliver);

 }

#

 sub vcl_deliver {

     return (deliver);

 }

#

# sub vcl_error {

#     set obj.http.Content-Type = "text/html; charset=utf-8";

#     set obj.http.Retry-After = "";

#     synthetic {"

# <?xml version="1.0" encoding="utf-8"?>

# <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"

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

# <html>

#   <head>

#     <title>"} + obj.status + " " + obj.response + {"</title>

#   </head>

#   <body>

#     <h1>Error "} + obj.status + " " + obj.response + {"</h1>

#     <p>"} + obj.response + {"</p>

#     <h3>Guru Meditation:</h3>

#     <p>XID: "} + req.xid + {"</p>

#     <hr>

#     <p>Varnish cache server</p>

#   </body>

# </html>

# "};

#     return (deliver);

# }

#

 sub vcl_init {

        return (ok);

 }

#

 sub vcl_fini {

        return (ok);

 }

运行测试（启动tomcat1，tomcat2）

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