High hit rate varnish cache configuration Sharing _ server other

To everyone a even I so ugly blog, hit rate can reach 75% of the varnish configuration, we take to the situation under their own site optimization, maybe also can reach 90%, this is not impossible.

System: CentOS 5.x
Software: varnish-3.0.5

1. Install varnish

How to install I will not say it, search yourself.

2.varnish Configuration

Copy Code code as follows:

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 {
# can only be refreshed on this machine
"LocalHost";
}

# Below is a commented-out copy of the default VCL logic. If You
# Redefine any of these subroutines, the built-in logic would be
# appended to your code.

Sub Vcl_recv {
#判断请求主机, jump to the appropriate back-end server
if (req.http.host ~ "^ (. *) (slogra.com)")
{
Set Req.backend=slogra;
}else{
Error 408 "Hostname not Found";
}

#grace缓存过期仍存放
# If the backend is healthy, then only Grace 5s, if backend is not healthy, then grace 1m.
# here, the purpose of 5s is to increase throughput at high concurrency;
# 1m purpose is, backend hang up, still can continue to serve a period of time, expect backend hang not too long ...
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 so that it can be cached to varnish
Unset Req.http.cookie;
}

#Accept-encoding is a browser-sent server that declares the type of encoding supported by the browser.
#修正客户端的Accept-encoding Header information
#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 header information to facilitate back-end programs to obtain client 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") {
/* We only deal with get and head by default * *
return (pass);
}
if (req.http.Authorization) {
/* not cacheable by default * *
return (pass);
}
#js, CSS files have cookies, not every time to go to the backend server to fetch
#if (Req.http.Cookie) {
#/* Not cacheable by default * *
# 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 {
# That's only the ' the ' the ' backend'll have
# x-forwarded-for set. If 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 isn't set by default as it might break some broken web
# applications, like IIS with NTLM authentication.
return (pipe);
}
#放过, let it go directly to the background server requesting data
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 to prevent content from being sent to a browser that does not support compression
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, set the TTL to 0 and return the processing result code
if (req.request = = "PURGE") {
set obj.ttl = 0s;
Error "purged."
}
#缓存服务器命中后 (found)
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 (go to backend server to fetch)
return (fetch);
}
#从后台服务器取回数据后, Cache if appropriate
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, be sure to put it in front of the handle
if (req.url ~ "^ (. *) \. ( PHP|JSP|DO|ASPX|ASMX|ASHX) ($|. *)") {
Set beresp.http.cache-control= "No-cache, No-store";
Unset beresp.http.Expires;
return (deliver);
}
# set Beresp.grace only if the request can be cached, and if the request cannot be cached, do not set Beresp.grace
if (beresp.ttl > 0s) {
Set beresp.grace = 1m;
}
if (beresp.ttl <= 0s | |
Beresp.http.set-cookie | |
Beresp.http.Vary = = "*") {
/*
* Mark as "Hit-for-pass" for the next 2 minutes
*/
Set Beresp.ttl = S;
#下次请求时不进行lookup, Direct Pass
return (Hit_for_pass);
}
#设置从后台服务器获得的特定格式文件的缓存TTL
if (req.url ~ "^ (. *) \. ( Pdf|xls|ppt|doc|docx|xlsx|pptx|chm|rar|zip) ($|\?) ")
{
#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, not cached, not cached
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 to determine if the cache hit.
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" >
<title> "} + Obj.status +" "+ Obj.response + {" </title>
<body>
<p> "} + obj.response + {" </p>
<p>xid: "} + Req.xid + {" </p>
<p>cache server</p>
</body>
"};
return (deliver);
}
Sub Vcl_init {
return (OK);
}
Sub Vcl_fini {
return (OK);
}

3. Effect drawing

OK, everyone is interested, you can do it yourself.