你的位置:首页 > 操作系统

[操作系统]利用varnish做Discuz论坛的缓存服务器

实验背景:公司有一台BBS服务器,用的是LNMP的架构搭建的。正好手头有一台空闲的虚拟机,于是想着给BBS前端加一台缓存服务器。于是选定了varnish,搜了很多教程,跌跌撞撞的完成了配置。这其中很多配置的作用我也不是十分了解,这里先给出大体的配置,之后有时间会研究一下其中配置的原理和具体作用。

实验系统:CentOS 6.4_x86_64

实验前提:防火墙和selinux都关闭

实验说明:本实验共有2台主机,IP分配如拓扑

实验软件:varnish-3.0.7-1  varnish-libs-3.0.7-1

下载地址:http://pan.baidu.com/s/1hq8hgoO

实验拓扑:

        

一、安装并配置varnish

  1.在70.186上直接使用yum安装:

yum -y install varnish-3.0.7-1.el6.x86_64.rpm varnish-libs-3.0.7-1.el6.x86_64.rpm

  2.编辑/etc/sysconfig/varnish文件:

vim /etc/sysconfig/varnish------------------------------------------------>## Alternative 3, Advanced configurationVARNISH_VCL_CONF=/etc/varnish/default.vcl                   //使用的vcl文件VARNISH_LISTEN_PORT=80                             //varnish自己监听的端口VARNISH_ADMIN_LISTEN_ADDRESS=127.0.0.1                    //admin管理接口使用的ipVARNISH_ADMIN_LISTEN_PORT=6082                        //admin管理接口使用的端口VARNISH_SECRET_FILE=/etc/varnish/secret                    //密码文件VARNISH_MIN_THREADS=50                            //最小进程数VARNISH_MAX_THREADS=1000                           //最大进程数VARNISH_THREAD_TIMEOUT=120                          //超过此时间回收空闲进程VARNISH_STORAGE_SIZE=1G                           //存储文件大小VARNISH_STORAGE="malloc,${VARNISH_STORAGE_SIZE}"               //指明使用存储的类型及文件VARNISH_TTL=120DAEMON_OPTS="-a ${VARNISH_LISTEN_ADDRESS}:${VARNISH_LISTEN_PORT} \       -f ${VARNISH_VCL_CONF} \       -T ${VARNISH_ADMIN_LISTEN_ADDRESS}:${VARNISH_ADMIN_LISTEN_PORT} \       -t ${VARNISH_TTL} \       -w ${VARNISH_MIN_THREADS},${VARNISH_MAX_THREADS},${VARNISH_THREAD_TIMEOUT} \       -u varnish -g varnish \       -S ${VARNISH_SECRET_FILE} \       -s ${VARNISH_STORAGE}"

  3.编辑vcl文件:

vim /etc/varnish/default.vcl--------------------------------------------------------->backend default { .host = "192.168.90.186"; .port = "80";}acl local { "localhost"; "127.0.0.1";} 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 == "PURGE") {    if (!client.ip ~ local) {     error 405 "Not Allowed.";    }    return (lookup);   }   if (req.request == "GET" && req.url ~ "\.(jpg|png|gif|swf|jpeg|flv|bmp|gz|tgz|bz2|tbz|js|css|ico)$") {    unset req.http.cookie;   }   if (req.request == "GET" && req.url ~ "\.(js|css).*$") {    unset req.http.cookie;   }   if (req.url ~ "^/images") {    unset req.http.cookie;   }    if (req.request != "GET" &&    req.request != "HEAD" &&    req.request != "PUT" &&    req.request != "POST" &&    req.request != "TRACE" &&    req.request != "OPTIONS" &&    req.request != "DELETE") {     return (pipe);   }   if (req.request != "GET" && req.request != "HEAD") {     return (pass);   }   if (req.http.Authorization || req.http.Cookie) {     return (pass);   }   if (req.request == "GET" && req.url ~ "\.(php)($|\?)") {     return (pass);   }   return (lookup); } sub vcl_pipe {   return (pipe); } sub vcl_pass {   if (req.request == "PURGE") {  error 502 "PURGE on a passed object";   }   return (pass); } sub vcl_hash {   hash_data(req.url);   if (req.http.host) {     hash_data(req.http.host);   } else {     hash_data(server.ip);   }   return (hash); } sub vcl_hit {   if (!obj.ttl > 0s) {    return (pass);   }   if (req.request == "PURGE") {     purge;     error 200 "Purged.";   }   return (deliver); } sub vcl_miss {   if (req.request == "PURGE") {  purge;  error 404 "Not in cache";   }   return (fetch); } sub vcl_fetch {   if (beresp.ttl <= 0s ||     beresp.http.Set-Cookie ||     beresp.http.Vary == "*") {     set beresp.ttl = 120 s;     return (hit_for_pass);   }   if (beresp.http.Pragma ~ "no-cache" ||     beresp.http.Cache-Control ~ "no-cache" ||     beresp.http.Cache-Control ~ "private") {     return (hit_for_pass);   }   if (req.request == "GET" && req.url ~ "\.(bmp|jpeg|jpg|png|gif|svg|png|ico|txt|css|js|html|htm)$") {     unset beresp.http.set-cookie;     set beresp.ttl = 1h;   } else {     set beresp.ttl = 1800s;   }   return (deliver); } sub vcl_deliver {   if (obj.hits > 0) {  set resp.http.X-Cache = "Hit Via" + " " + server.hostname;   } else {    set resp.http.X-Cache = "Miss Via" + " " + server.hostname;   }   return (deliver); } sub vcl_init {   return (ok); } sub vcl_fini {   return (ok); }

  4.启动varnish,查看端口,并打开浏览器测试:

service varnish startss -tnl

    

二、访问测试:

  1.浏览器打开http://192.168.70.186,并随机访问一些内容:

    

  2.varnish状态查看:

varnishstat

    

  3.图表查看:

varnishhist

    

  4.前端客户端用浏览器的F12功能查看缓存是否命中,这里用chrome演示:

    

   至此,缓存服务器搭建完毕,这其中还会有些问题,今天先粗浅的演示一下,谢谢大家!QQ:82800452