CentOS系统下配置安装varnish服务器

我们到官方网站找到最新版本，目前是3.0.1
先执行
rpm --nosignature -i http://repo.varnish-cache.org/redhat/varnish-3.0/el5/noarch/varnish-release-3.0-1.noarch.rpm
指定安装包下载源，然后安装
yum install varnish
安装成功后，修改配置文件。
先假定我的Varnish安装在192.168.0.50上，另外有一台192.168.0.51服务器，我想通过varnish服务来代理针对于50上nginx和51上的nginx项目。这时将50的80端口分给varnish，将nginx的端口改为81或者8080等其它端口。设定abc.com 项目内容在50的nginx上，def.com项目内容在51的nginx上，这时将这2个域名都解析到50的80端口上，也就是varnish上。
vi /etc/varnish/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 default {
  .host = "127.0.0.1";
  .port = "81";
}
backend test {
  .host = "192.168.0.51";
  .port = "80";
}
#
# 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 {
     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);
     }
     if (req.http.host ~ "abc.com") {
        set req.backend = default;
     }
     elseif (req.http.host ~ "def.com") {
        set req.backend = test;
     }
     else{
        error 404 "Unknown HostName!";
     }
     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 {"
 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 
  
    
  
  
     Error "} + obj.status + " " + obj.response + {"
    

"} + obj.response + {"

    

Guru Meditation:

    

XID: "} + req.xid + {"

    

---

    

Varnish cache server

  
 
 "};
     return (deliver);
 }
 sub vcl_init {
        return (ok);
 }
 sub vcl_fini {
        return (ok);
 }
按上诉配置后保存。
然后个人没有用系统自带的service启动，写了shell命令进行启动，可将其保存为restart_varnish.sh，启动时执行即可。内容如下：
pkill varnish
/usr/sbin/varnishd -u www -g www -f /etc/varnish/default.vcl -p http_max_hdr=256 -p http_req_hdr_len=8192 -p http_resp_hdr_len=16384 -p connect_timeout=30s -p send_timeout=60s -s malloc,1G -T 127.0.0.1:2000 -a 0.0.0.0:80
其中用户www和用户组www都是之前通过groupadd和useradd建好的，专门是用来操作varnish的。
配置中的优化以及细节参数以后再写。