varnish

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

由 瘦欲@ 提交于 2019-12-29 10:08:16
问题 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

Is the HTTP method PURGE idempotent in Varnish?

由 半城伤御伤魂 提交于 2019-12-29 01:45:17
问题 Is the HTTP verb PURGE idempotent? If I send the same PURGE request twice will I receive 200 the second time? I have a microservice that invalidates a Varnish cache before publishing a message into a rabbit queue. In case of purge failure our need is to just log and continue the execution. The queue consumer has to get the latest status of the resource from the Varnish cache. Will a new purge request (before actually requesting the resource from varnish) from the second microservice return

Unable to login through Varnish 4 cache

由 老子叫甜甜 提交于 2019-12-25 08:32:11
问题 I need some help. How can I do this in new version? since vcl_fetch is old and it is not accepeed now in Varnish 4. sub vcl_fetch{ if (beresp.http.set-cookie ~ "sessionid" || beresp.http.set-cookie ~ "csrftoken") { return (pass); } else { return (deliver); } } 回答1: Vcl_fetch has been moved to vcl_backend_response. That said it's not a good idea to return pass from vcl_backend_response. You should rewrite your return (pass) to set beresp.uncacheable = true; set beresp.ttl = 120s; return

Varnish Cache with PHP Captcha for Anti-Site-Scrapping Algorithm

由 我们两清 提交于 2019-12-24 09:48:17
问题 I've got Varnish cache working with PHP Captcha but I don't understand yet how I can set the trigger limits. After the limit of so many requests per hour (or minute) the captcha input is sent. I have it working but would like to be understand how I can alter the req/s limit. Here is the code from: http://drcarter.info/2010/04/how-fighting-against-scraping-using-varnish-vcl-inline-c-memcached/ What is this code saying to me? if (rc == MEMCACHED_SUCCESS) { uint64_t intval; rc= memcached

Grep multiple strings and then replace text

由 空扰寡人 提交于 2019-12-24 05:56:24
问题 I have below varnish command: sudo varnishlog -c and its output * << Request >> 658516 - Begin req 658515 rxreq - ReqMethod GET - ReqURL /sample/2 - VCL_call HIT - RespHeader X-Timestamp: 1460482977.61998 - RespHeader X-Varnish: 658516 658416 - RespHeader X-Varnish-Cache: HIT From this command output I want to redirect the output to a file with following fomat: Begin="req 658515 rxreq",ReqURL="/sample/2", RespHeader="X-Varnish-Cache: HIT" I have used grep command to get the required fields:

Magento + Varnish - Logic for stores that open and close at specific Times

由 落花浮王杯 提交于 2019-12-24 01:25:57
问题 I recently deployed my Magento site and started using Varnish on it. However, we do have some PHP logic that place an open and close button on each of the stores (they are open on working times), and after it`s closed it should received any orders. Also, we have logics on the buttons 'Add to Cart', to inform the customer when the store is opened. The issue here is that if I serve the pages with VArnish, the loading time indeed is marvelous, however when the store gets opened (or closed), the

HTTP Status Code 206: When should it be used?

由 吃可爱长大的小学妹 提交于 2019-12-24 00:48:32
问题 The 206 status code (w3.org) indicates a partial result in response to a request with a Range header. So "clearly" if the requested document is e.g. 1024 bytes long, and the Range header is bytes=0-512 then a status code of 206 Partial Content should be returned. (Assuming that the server is able to return the content) BUT what if the Range is bytes=0-2000 ? Should 200 OK or 206 Partial Content be returned? It seems to me that this isn't clearly defined in the specification -- or maybe I'm

curl -i and curl -I returning different results

由 只愿长相守 提交于 2019-12-24 00:39:41
问题 My understanding was that curl -i and curl -I would return virtually the same results except that curl -i would return the standard output along with the header and curl -I would only return the header -- the header of both being the same. We've been doing some gzip and un-gzipped testing with Varnish and stumbled upon the oddity that curl -i shows X-Cache: HIT but curl -I returns X-Cache: MISS ! How this is possible, I am unsure and that is precisely my question in this post. Here are some

企业级--CDN及varnish介绍

由 随声附和 提交于 2019-12-23 21:37:02
一、varnish简介 1.varnish是什么？ Varnish是一款高性能且开源的反向代理服务器和http加速器（缓存服务器）。Varnish使用内存缓存文件来减少响应时间和网络带宽消耗。 2.varnish的特点 Varnish访问速度更快，Varnish采用了“Visual Page Cache”技术，所有缓存数据都直接从内存读取，而squid是从硬盘读取，因而Varnish在访问速度方面会更快。（所以说varnish有个缺点，当varnish进程一旦被down，缓存数据都会从内存中完全释放，此时所有请求都会发送到后端服务器，在高并发情况下，会给后端服务器造成很大压力。） Varnish可以支持更多的并发连接，因为Varnish的TCP连接释放要比Squid快。因而在高并发连接情况下可以支持更多TCP连接。 Varnish可以通过管理端口，使用正则表达式批量的清除部分缓存，而Squid是做不到的。 squid属于是单进程使用单核CPU，但Varnish是通过fork形式打开多进程来做处理，所以是合理的使用所有核来处理相应的请求。 事实上，varnish整体的性能将会高于squid; 3.CDN的全称是Content Delivery Network，即内容分发网络。CDN是构建在现有网络基础之上的智能虚拟网络，依靠部署在各地的边缘服务器，通过中心平台的负载均衡、内容分发

Varnish and ESI HTTP AUTH

由 大城市里の小女人 提交于 2019-12-21 22:34:40
问题 I'm very lost on this problem, and I don't know where could be the problem, so, I hope that you could help me. I have an HTTP BASIC authentification with symfony, and I'm trying to reach an url which is protected by this auth, with an tag in a Drupal page. Every requests are send to a Varnish I give username and password in the url like that : <esi:include src="http://admin:adminpass@api.dev:8081/app.php/next"/> In my varnish configuration file, I have only that lines for auth.http: if (req
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