今天小编跟大家讲解下有关高命中率的varnish缓存配置分享 ，相信小伙伴们对这个话题应该也很关注吧，小编也收集到了有关高命中率的varnish缓存配置分享 的相关资料，希望小伙伴会喜欢也能够帮助大家。
给大家一个连我这么丑的blog,命中率都可以达到75%的varnish配置,大家拿去根据自己网站情况再优化下的话,说不定也可以达到90%,这也不是不可能的事。
系统:centos 5.x软件:varnish-3.0.5
1.安装varnish
怎么安装我就不说了吧,自己搜去。
2.varnish配置
复制代码 代码如下: backend slogra { .host ="172.0.0.1"; .port ="80"; .connect_timeout = 20s; .first_byte_timeout = 20s; .between_bytes_timeout = 20s; } #允许刷新缓存的规则 acl purgeAllow { # 只能本机进行刷新"localhost"; } # 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 { #判断请求主机,跳转到相应后端服务器 if(req.http.host ~"^(.*)(slogra.com)") { set req.backend=slogra; }else{ error 408"Hostname not found"; } #grace缓存过期仍存放 # 若backend是健康的，则仅grace 5s，如果backend不健康，则grace 1m。 # 这里，5s的目的是为了提高高并发时的吞吐率； # 1m的目的是，backend挂了之后，还能继续服务一段时间，期望backend挂的不要太久。。。 if (req.backend.healthy) { set req.grace = 5s; } else { set req.grace = 1m; } #刷新缓存的处理 if (req.request =="PURGE"){ if(!client.ip ~ purgeAllow) { error 405"Not allowed."; } # #转到hit或者miss处理 return (lookup); } #移除一些特定格式的cookie if (req.url ~"^(.*)\.(jpg|png|gif|jpeg|flv|bmp|gz|tgz|bz2|tbz|js|css|html|htm)($|\?)") { #移除cookie,以便能缓存到varnish unset req.http.cookie; } #Accept-Encoding 是浏览器发给服务器,声明浏览器支持的编码类型的 #修正客户端的Accept-Encoding头信息 #防止个别浏览器发送类似 deflate, gzip if (req.http.Accept-Encoding) { if (req.url ~"^(.*)\.(jpg|png|gif|jpeg|flv|bmp|gz|tgz|bz2|tbz)($|\?)") { remove req.http.Accept-Encoding; }else if (req.http.Accept-Encoding ~"gzip"){ set req.http.Accept-Encoding ="gzip"; } else if (req.http.Accept-Encoding ~"deflate"){ set req.http.Accept-Encoding ="deflate"; } else if (req.http.Accept-Encoding ~"sdch"){ #chrome新增加的压缩 set req.http.Accept-Encoding ="sdch"; }else { remove req.http.Accept-Encoding; } } #首次访问增加X-Forwarded-For头信息,方便后端程序获取客户端ip 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") { return (pipe); } if (req.request !="GET"&& req.request !="HEAD") { return (pass); } if (req.http.Authorization) { return (pass); } #js,css文件都有Cookie,不能每次都去后台服务器去取 #if (req.http.Cookie) { # # return (pass); #} #如果请求的是动态页面直接转发到后端服务器 if (req.url ~"^(.*)\.(php|jsp|do|aspx|asmx|ashx)($|.*)") { return (pass); } return (lookup); } sub vcl_pipe { # Note that only the first request to the backend will have # X-Forwarded-For set. If you use X-Forwarded-For and want to # have it set for all requests, make sure to have: # set bereq.http.connection ="close"; # here. It is not set by default as it might break some broken web # applications, like IIS with NTLM authentication. return (pipe); } #放过,让其直接去后台服务器请求数据 sub vcl_pass { return (pass); } sub vcl_hash { hash_data(req.url); if (req.http.host) { hash_data(req.http.host); } else { hash_data(server.ip); } #支持压缩的要增加,防止发送给不支持压缩的浏览器压缩的内容 if(req.http.Accept-Encoding){ hash_data(req.http.Accept-Encoding); } return (hash); } #缓存服务器lookup查找命中:hit sub vcl_hit { #刷新缓存的请求操作,设置TTL为0,返回处理结果代码 if (req.request =="PURGE") { set obj.ttl = 0s; error 200"Purged."; } #缓存服务器命中后(查找到了) return (deliver); } #缓存服务器lookup查找没有命中:miss sub vcl_miss { #刷新缓存的请求操作, #if (req.request =="PURGE") { # error 404"Not in cache."; #} #缓存服务器没有命中(去后台服务器取) return (fetch); } #从后台服务器取回数据后,视情况是否进行缓存 sub vcl_fetch { #如果请求的是动态页面直接发转发 #动态请求回来的,一定要放在前面处理 if (req.url ~"^(.*)\.(php|jsp|do|aspx|asmx|ashx)($|.*)") { set beresp.http.Cache-Control="no-cache, no-store"; unset beresp.http.Expires; return (deliver); } # 仅当该请求可以缓存时，才设置beresp.grace，若该请求不能被缓存，则不设置beresp.grace if (beresp.ttl > 0s) { set beresp.grace = 1m; } 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; #下次请求时不进行lookup,直接pass return (hit_for_pass); } #设置从后台服务器获得的特定格式文件的缓存TTL if (req.url ~"^(.*)\.(pdf|xls|ppt|doc|docx|xlsx|pptx|chm|rar|zip)($|\?)") { #移除服务器发送的cookie unset beresp.http.Set-Cookie; #加上缓存时间 set beresp.ttl = 30d; return (deliver); }else if(req.url ~"^(.*)\.(bmp|jpeg|jpg|png|gif|svg|png|ico|txt|css|js|html|htm)($|\?)"){ #移除服务器发送的cookie unset beresp.http.Set-Cookie; #加上缓存时间 set beresp.ttl = 15d; return (deliver); }else if(req.url ~"^(.*)\.(mp3|wma|mp4|rmvb|ogg|mov|avi|wmv|mpeg|mpg|dat|3pg|swf|flv|asf)($|\?)"){ #移除服务器发送的cookie unset beresp.http.Set-Cookie; #加上缓存时间 set beresp.ttl = 30d; return (deliver); } #从后台服务器返回的response信息中,没有缓存的,不缓存 if (beresp.http.Pragma ~"no-cache"|| beresp.http.Cache-Control ~"no-cache"|| beresp.http.Cache-Control ~"private") { return (deliver); } return (deliver); } #缓存服务器发送到客户端前调用 sub vcl_deliver { #下面是添加一个Header标识，以判断缓存是否命中。 if (obj.hits > 0) { set resp.http.X-Cache ="HIT from cache"; #set resp.http.X-Varnish ="HIT from cache"; } else { set resp.http.X-Cache ="MISS from cache"; #set resp.http.X-Varnish ="MISS from cache"; } #去掉不是必须的header unset resp.http.Vary; unset resp.http.X-Powered-By; unset resp.http.X-AspNet-Version; 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>cache server</p> </body> </html>"}; return (deliver); } sub vcl_init { return (ok); } sub vcl_fini { return (ok); }
3.效果图
好了,大家有兴趣的,可以自己去搞.
来源：爱蒂网