Varnish configuration

最新推荐文章于 2021-08-24 10:31:14 发布

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最新推荐文章于 2021-08-24 10:31:14 发布

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分类专栏： Varnish 文章标签： Varnish

本文链接：https://blog.youkuaiyun.com/king_sky_wjb/article/details/24716517

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本文介绍Varnish缓存系统的配置方法，包括后端服务器设置、请求处理流程、缓存策略等核心内容，并提供了详细的VCL示例代码。

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# 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 = "8080";
# }

##设置后端服务器地址
backend default {
  .host = "127.0.0.1";
  .port = "80";
}

##用于接受和处理请求，当请求成功被调用后，Varnish通过判断请求的数据来决定如何处理请求。
# 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 {

   ##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) {
   ##如果设置过此header则要再次附加上，用，隔开，如果只有一层代理的话，就无需设置了
# if (req.http.x-forwarded-for) {
# set req.http.X-Forwarded-For =
# req.http.X-Forwarded-For + ", " + client.ip;
# } else {
   //没有就加上
# set req.http.X-Forwarded-For = client.ip;
# }
# }

   ##非正规的请求直接转发给后端服务器
# 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);
# }

   ##只处理GET和HEAD请求，如果你不想缓存POST的页面的话
# if (req.request != "GET" && req.request != "HEAD") {
# /* We only deal with GET and HEAD by default */
# return (pass);
# }
   ##HTTP认证的页面也不处理
# if (req.http.Authorization || req.http.Cookie) {
# /* Not cacheable by default */
# return (pass);
# }
# return (lookup);
# }
#

##管道官方说法时此模式下请求会原封不动的转交给后端直到连接关闭
# 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);
# }
#

##交给后端服务器
# sub vcl_pass {
# return (pass);
# }
#

##缓存文件名的hash处理
# sub vcl_hash {
   ##以url为hash
# hash_data(req.url);
   ##加上host
# if (req.http.host) {
# hash_data(req.http.host);
# } else {
   ##没有则获取IP
# hash_data(server.ip);
# }
# return (hash);
# }
#

##缓存命中后的处理
# sub vcl_hit {
# return (deliver);
# }
#

##缓存为命中
# sub vcl_miss {
# return (fetch);
# }
#

##在后端主机更新缓存并且获取内容后调用的方法，接着，通过判断获取的内容来决定是否将内容放入缓存，还是直接返回给客户端。
# 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);
# }
#

##发送给客户端
# sub vcl_deliver {
   ##去掉varnish中的一些头信息（如果你不想保留的话，建议保留age，方便查看）
   ##remove resp.http.X-Varnish;
   ##remove resp.http.Via
# return (deliver);
# }
#

##发送错误页面的信息
# sub vcl_error {
   ##设置返回页面的类型及编码
# set obj.http.Content-Type = "text/html; charset=utf-8";
# set obj.http.Retry-After = "5";
   ##设置返回的具体内容，可以根据自己的需要修改错误信息
# 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);
# }

参考文档：http://www.ibm.com/developerworks/cn/opensource/os-cn-varnish-intro/