varnish

I want to purge Elements of my varnish using HTTP. This http call is triggered from a backend server behind the varnish itself, so the backend server has not other access but HTTP. I have implemented the following purging rules with the according ACL which work fine for curl -X PURGE http://www.example.com/image/123/photo-100-150.jpg but I want to be able to purge an URL via HTTP using Regex curl -X PURGE http://www.example.com/image/123/*.jpg That way I want to clear all scaled version of this image once a new has been uploaded. Is there a way? try this: if varnish 3.0 and up. vcl_recv { if

The previous 2 Heroku application stacks came with a Varnish layer which automatically reverse-proxy-cached content based on http headers. The new Heroku cedar stack doesn't have this Varnish layer. Heroku suggests using rack-cache and memcache instead. Does this have disadvantages compared to the previous stacks with the varnish layer? With rack-cache, aren't there fewer servers serving the caching layer, and in a less optimized way? http://devcenter.heroku.com/articles/http-routing http://devcenter.heroku.com/articles/http-caching http://devcenter.heroku.com/articles/cedar There is

I have been Googling aggressively, but without luck. I'm using Varnish with great results, but I would like to host multiple websites on a single server (Apache), without Varnish caching all of them. Can I specify what websites by URL to cache? Thanks (edited after comment) It's req.http.host, so in your vcl file (e.g. default.vcl) do: sub vcl_recv { # dont cache foo.com or bar.com - optional www if (req.http.host ~ "(www\.)?(foo|bar)\.com") { pass; } # cache foobar.com - optional www if (req.http.host ~ "(www\.)?foobar\.com") { lookup; } } And in varnish3-vcl: sub vcl_recv { # dont cache foo

As Varnish Version 3 has some objects for different operations. For Example, pass is used when it has to retrieve data from backend. and it uses hit when it finds requesting content in cache. But I cant understand usage of hit-for-pass. when varnish uses it ? I haven't found any useful material on net which make me clear. lkarsten A hit_for_pass object is made to optimize the fetch procedure against a backend server. For ordinary cache misses, Varnish will queue all clients requesting the same cache object and send a single request to the backend. This is usually quickest, letting the backend

I need to write VCL in Varnish so to prevent caching under certain conditions like cookie value. Any idea how to do that? Write and load your own .vcl file to instruct varnish when to cache. By default, requests with cookies will not be cached. You could start with the Varnish tutorial , and don't hesitate to ask a more specific question on this site if you can't make it work... Place the following inside your vcl_recv: # as soon as we have a NO_CACHE cookie pass request if (req.http.cookie ~ "NO_CACHE=") { return (pass); } 来源： https://stackoverflow.com/questions/9478986/how-to-write-vcl-in

Backend servers varnish有"后端"或者"源"服务器的概念。backend server提供给varnish加速的内容。 第一步设置是告诉varnish从哪儿找到backend server。使用你喜欢的编辑器打开varnishd引入的VCL文件。 VCL文件的开头有一小段有点像这样： # backend default { # .host = "127.0.0.1"; # .port = "8080"; # } 去掉注释后 backend default { .host = "127.0.0.1"; .port = "8080"; } 这样一段配置在varnish中定义了一个后端，被叫做default。（和c的函数定义有点相似），当varnish需要从后端获得内容时，它将连接127.0.0.1的8080端口。 varnish可以定义多个后端，也可以将几个后端放在一个后端集群里面已达到负载均衡的目的。 Multiple backends 某些情况下你可能需要让varnish缓存多个后端的内容。你可能想让varnish映射所有的url在单个后端上，或者是多个后端。这里有些参数可以满足这样的需求。 现在我们需要在PHP站点中引入java应用。java应用的链接都是以/java/开头的。 处理java应用的服务器监听在8000端口上。默认的default

Varnish Installation varnish的安装 本节包含了varnish安装的准备工作，一步一步的安装过程，怎样获取帮助，在哪里寻求帮助，已经怎样报告bug。也包含了帮助你在某些特殊的系统上安装varnish的注意事项. Prerequisites Installing Varnish Source or packages? FreeBSD Red Hat / CentOS Debian/Ubuntu Compiling Varnish from source Build dependencies on Debian / Ubuntu Build dependencies on Red Hat / CentOS Compiling Varnish Installing Getting help IRC Channel Mailing Lists Trouble Tickets Commercial Support Reporting bugs Varnish crashes Varnish goes on vacation Varnish does something wrong Platform specific notes Transparent hugepages on Redhat Enterprise Linux 6 OpenVZ TCP keep

Security first 安全第一 如果你仅仅抓专注于运行varnish,或者所有人都是这个观点,那么就可以跳过该节了.我们保护你的方方面面当http请求来的时候. 如果你的web基础设施是外包的,管理是分开的,那么你就需要考虑安全了. Varnish在4个权威的等级提供安全,大致关系到怎样让命令生效和在哪儿生效. the command line arguments, the CLI interface, VCL programs, and HTTP requests. Command line arguments 命令行参数 最高安全定理是决定和定义varnish的启动参数在一个表单里面,我们使用这个策略是为了新的操作也是安全的. 最重要的的决定是确保这些: Who should have access to the Command Line Interface? 谁有命令行的权限? Which parameters can they change? 他们可以修改哪些参数? Will inline-C code be allowed? 哪些内建C代码是被允许的? If/how VMODs will be restricted? 是否VMODs是被限制,怎样被限制? CLI interface access CLI接口权限 命令行接口可以通过三个方式进入.

I'm using stale-if-error to deliver stale content while the server is marked unhealthy looking at grace and keep object options in vcl_hit . The question is: Is it possible to deliver a cache object after entering the vcl subroutine vcl_backend_error (fresh request error). Actually, I deliver cached object at vcl_hit but looking at the next diagram, I don't see how it is possible to access the cached object of that request. Source: https://www.varnish-software.com/book/4.0/chapters/VCL_Basics.html When using the built-in VCL (see code bellow): # Built-in 'vcl_hit'. sub vcl_hit { if (obj.ttl >=