7.1 Varnish VCL

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(7)
# 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 = "8080";
     .connect_timeout = 1s;
     .first_byte_timeout = 5s;
     .between_bytes_timeout = 2s;
 }

 backend b2{
        .host = "127.0.0.1";
        .port = "9080";
        .connect_timeout = 1s;
        .first_byte_timeout = 5s;
        .between_bytes_timeout = 2s;
}
 director d1 random{
        .retries = 5;
        {
                .backend = b1;
                .weight = 7;
        }
        {
                .backend = b2;
                .weight = 3;
        }
}



# 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 405 "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 == 0) {
                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 = 120 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 = "5";
#     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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