varnish

Stripping out select querystring attribute/value pairs so varnish will not vary cache by them

故事扮演 提交于 2019-11-30 05:15:59
My goal is to "whitelist" certain querystring attributes and their values so varnish will not vary cache between the urls. Example: Url 1: http://foo.com/someproduct.html?utm_code=google&type=hello Url 2: http://foo.com/someproduct.html?utm_code=yahoo&type=hello Url 3: http://foo.com/someproduct.html?utm_code=yahoo&type=goodbye In the above example I want to whitelist "utm_code" but not "type" So after the first url is hit I want varnish to serve that cached content to the second url. However, in the case of the third url, the attribute "type" value is different so that should be a varnish

How to debug VCL in varnish?

回眸只為那壹抹淺笑 提交于 2019-11-30 03:14:50
How can I print a log in VCL? Can I print log info on screen? Can I do like this? sub vcl_recv { .... log.info(req.http.host); // can i write a log here? .... } ghloogh You can see URL with requested URLs varnishlog utility (it able to write log files) varnishlog -i RxURL Or output some info to syslog with vmod std and syslog function for Varnish 3.x https://www.varnish-cache.org/docs/trunk/reference/vmod_std.html#syslog Varnish 5.1 https://varnish-cache.org/docs/5.1/reference/vmod_std.generated.html#func-syslog Example: import std; sub vcl_recv { ... std.syslog(180, "RECV: " + req.http.host +

Regex Syntax changes between POSIX and PCRE

生来就可爱ヽ(ⅴ<●) 提交于 2019-11-30 00:45:35
问题 We are currently in the process of upgrading our Varnish Cache servers. As part of the process, we upgraded only one of them to see how it behaves compared to the older versions. Some of the major changes made in this new version is changing the regex engine from POSIX to PCRE. That means that some of our purges (regex purges) have stopped working on the newer server. I was wondering if anyone can list/point me to a list of actual syntax differences between POSIX and PCRE. Or maybe a function

varnish 4.0 官方文档翻译3-简要教程

此生再无相见时 提交于 2019-11-29 22:31:28
varnish 4.0简要教程 这部分教程包含了varnish基本原理。囊括了什么是varnish、它怎样工作,同时也包含了开始使用和运行varnish。这部分过后你可能想继续了解用户向导(varnish用户引导)。 如果你正在web上读这些呢 注意每页左边的Next topic和Previous topic The fundamentals of web proxy caching with Varnish使用varnish作为web代理缓存的原理 Supported platforms 支持平台 About the Varnish development process varnish开发程序相关信息 Getting in touch 联系 Starting Varnish 开始使用varnish Put Varnish on port 80 让varnish监听在80端口 Restarting Varnish again 再次重启varnish Backend servers 后端服务器 Peculiarities 特色 Now what? Now what? The fundamentals of web proxy caching with Varnish使用varnish作为web代理缓存的原理 varnish是一个http反向代理的缓存

varnish 4.0 官方文档翻译12-VCL

馋奶兔 提交于 2019-11-29 22:31:17
VCL - Varnish Configuration Language 本节包含了怎样通过varnish配置语言vcl来通知varnish如何处理http请求。 varnish是高度结构化的系统。大多数其他的系统使用配置指令,在那里你基本上打开和关闭大量的开关。而我们选择使用领域特定语言,被叫做VCL,来完成之前的功能。 每个进入的请求流通过varnish,同时你可以支配如何通过VCL代码来处理请求。你可以让某些后端直接处理请求,你可以改变请求和响应,或者让varnish拥有各种各样动作依赖于特定的处理请求和响应的阶段。这些特性让Varnish变成特别强力的http程序,而不仅仅是缓存。 varnish转换VCL成二进制代码,当请求到达这些代码将被执行。VCL对varnish的性能损耗是可以忽略不计的。 VCL文件将子程序组织在一起。不同的子程序在不同阶段被执行。一个是在我们收到请求时执行,其他的当从后端收到文件时执行。 如果你在你的子程序不调用某个动作,varnish将执行一些built-in(内建)的VCL代码。你可以看到这些内建的代码在 builtin.vcl 中注释的部分 本节包含以下: VCL Syntax Built in subroutines Request and response VCL objects actions Backend servers

varnish 4.0 官方文档翻译1-管理员文档

和自甴很熟 提交于 2019-11-29 22:31:04
varnish 管理员文档 varnish缓存是web应用加速器,同时也作为http反向缓存代理被人熟知。你可以安装varnish在任何http的前端,同时配置它缓存内容。varnish真的很快,单个代理的分发速度可以达到300-1000x,依赖与你的服务器架构。 开始使用varnish我们建议你阅读安装向导, Varnish Installation 。一旦varnish启动运行,我们建议你使用基础教程 Thte Varnish tutorial ,最后再是 The Varnish User Guide . 如果你想了解怎样使用varnish特定工具, The Varnish Reference Manual 包含这些工具的详细文档。 varnish4.0较3.x的变动,你可以查看 What's new in Varnish 4.0 。最后,我们从 Poul-Henning Kamp 收集了一些关于varnish和http的博客。 通常情况可以使用: service varnish restart 要么使用终端或者使用工具。 /usr/local/, varnishadm, sess_timeout 各种各样的配置参数或者路径 http://www.varnish-cache.org/ 官方网站的超链接 长的列表命令输出和VCL看起来像下面这样: $ /opt/varnish

varnish 4.0 官方文档翻译13-VCL Syntax

戏子无情 提交于 2019-11-29 22:30:50
VCL Syntax varnish从C继承了很多,同时它读起来像简单的C或者是Perl。 块由大括号分隔,语句用分号结束,注释可以根据自己的喜好来写为C,C ++或Perl的注释。 注意VCL不包含任何循环和跳转语句。 本节提供大致最重要部分的语法。完整的VCL语法文档请查看 https://www.varnish-cache.org/docs/4.0/reference/vcl.html#reference-vcl Strings 基本的字符是被双引号引起来,像"...",同时不可以跨行。 反斜杠不是特别的,例如regsub你不需要对\进行转义: regsub("barf", "(b)(a)(r)(f)", "\4\3\2p") -> "frap" 长字符应该被{"..."}。它们可以包含任何字符包括"、跨行、除了NUL(0×00)字符等控制字符。如果你真的想字符串中使用NUL字符,VMOD,使得它可以创建这样的字符串。 Access control lists (ACLs) ACL申明创建和初始化一个权限控制列表,通常用来匹配客户端地址: acl local { "localhost"; // myself "192.0.2.0"/24; // and everyone on the local network ! "192.0.2.23"; // except for

varnish 4.0 官方文档翻译4-varnish用户手册概况

点点圈 提交于 2019-11-29 22:30:34
The Varnish Users Guide varnish用户手册 varnish 文档包含三个主要的文档: The Varnish Tutorial 解释一些基本的东西让你开始使用varnish The Varnish Users Guide 说明varnish怎样工作以及怎么使用. The Varnish Reference Manual 包含具体的例子并且解决实际问题 然后是 The Big Varnish Picture (varnish整体情况) 用户手册将varnish作为服务运行的主要方面组织起来。 Starting and running 关于如何配置,使用什么存储(内存还是磁盘),sockets,安全,和运行的varnish如何通信。 VCL Varnish Configuration Language (varnish的配置语言)以你想要了方式来处理http请求,缓存什么,怎么缓存,修改http的头信息,等等 Reporting and statistics (报告和统计) 说明你怎样监控varnish是做了什么,汇总交易信息. Varnish and Website Performance 如何使用varnish来调优你的网站。 Troubleshooting Varnish 找出和修正常见的问题 The Big Varnish Picture

Best way to cache RESTful API results of GET calls

纵饮孤独 提交于 2019-11-29 22:22:46
I'm thinking about the best way to create a cache layer in front or as first layer for GET requests to my RESTful API (written in Ruby). Not every request can be cached, because even for some GET requests the API has to validate the requesting user / application. That means I need to configure which request is cacheable and how long each cached answer is valid. For a few cases I need a very short expiration time of e.g. 15s and below. And I should be able to let cache entries expire by the API application even if the expiration date is not reached yet. I already thought about many possible

Memcache(d) vs. Varnish for speeding up 3 tier web architecture

僤鯓⒐⒋嵵緔 提交于 2019-11-29 18:34:14
I'm trying to speed up my benchmark (3 tier web architecture), and I have some general questions related to Memcache(d) and Varnish. What is the difference? It seems to me that Varnish is behind the web server, caching web pages and doesn't require change in code, just configuration. On the other side, Memcached is general purpose caching system and mostly used to cache result from database and does require change in get method (first cache lookup). Can I use both? Varnish in front web server and Memcached for database caching? What is a better option? (scenario 1 - mostly write, scenario 2 -