varnish invalidate url REGEX from backend

Posted by ooouuiii on Stack Overflow See other posts from Stack Overflow or by ooouuiii
Published on 2014-08-22T22:17:52Z Indexed on 2014/08/22 22:20 UTC
Read the original article Hit count: 150

Filed under:

regex

|

varnish

|

purge

Say I have some highly-visited front-page, which displays number of some items by categories. When some item is added / deleted I need to invalidate this front-page/url and some 2 others.

What is the best practice how to invalidate those urls from backend in Varnish (4.x)?

From what I captured, I can:

implement my HTTP PURGE handler in VCL configuration file, that "bans" urls matching received regex
from backend to Varnish, send 3x HTTP PURGE requests for those 3 urls.

But is this approach safe for this automatic usage? Basicly I need to invalidate some views everytime some related entity is inserted/updated/deleted. Can it lead to ban list cumulation and increasing CPU consumption?

Is there any other approach? Thanks.

© Stack Overflow or respective owner

Related posts about regex

Find multiple regex in each line and skip result if one of the regex doesn't match

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a list of variables: variables = ['VariableA', 'VariableB','VariableC'] which I'm going to search for, line by line ifile = open("temp.txt",'r') d = {} match = zeros(len(variables)) for line in ifile: emptyCells=0 for i in range(len(variables)): regex = r'('+variables[i]+r')[:|=|\(](-… >>> More
OWASP Regex Repository: Is this regex correct?

as seen on Stack Overflow - Search for 'Stack Overflow'
I was looking at the regular expression for validating various data types from the (OWASP Regex Repository). One of the regular expressions in there is called safetext and looks like: ^[a-zA-Z0-9\s.\-]+$ My first question is: Is this regular expression correct? complementary question If this… >>> More
Make a Perl-style regex interpreter behave like a basic or extended regex interpreter

as seen on Stack Overflow - Search for 'Stack Overflow'
I am writing a tool to help students learn regular expressions. I will probably be writing it in Java. The idea is this: the student types in a regular expression and the tool shows which parts of a text will get matched by the regex. Simple enough. But I want to support several different regex… >>> More
JS regex isn't matching, even thought it works with a regex tester

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm writing a piece of client-side javascript code that takes a function and finds the derivative of it, however, the regex that's supposed to match with the power rule fails to work in the context of the javascript program, even though it sucessfully matches when it's used with an independent regex… >>> More
c# RegEx with "|"

as seen on Stack Overflow - Search for 'Stack Overflow'
I need to be able to check for a pattern with | in them. For example an expression like d*|*t should return true for a string like "dtest|test". I'm no regex hero so I just tried a couple of things, like: Regex Pattern = new Regex("s*\|*d"); //unable to build because of single backslash Regex Pattern… >>> More

Related posts about varnish

Issue varnish purge through CloudFlare to Varnish

as seen on Server Fault - Search for 'Server Fault'
I've been working on this for a while and can't seem to find any solution. I have varnish sitting in front of my nginx server, with CloudFlare sitting in front. When I issue a curl -X PURGE host CloudFlare picks it up and of course denies it with a 503 error. If I use direct.host to bypass CloudFlare… >>> More
Varnish 3.0.2 and ISPConfig 3.0.4

as seen on Server Fault - Search for 'Server Fault'
I followed the tutorial The Perfect Server - Ubuntu 11.10 [ISPConfig 3] here. I'm running an Ubuntu 11.04 (Natty Narwhal) server with 1024 RAM on Rackspace. I've gone through and updated to ISPConfig 3.0.4. Everything has been working great up to now when I decided to try and install Varnish. Initially… >>> More
How much RAM required by Varnish?

as seen on Server Fault - Search for 'Server Fault'
Hi, I'm using Apache for serving static files. Apache2 require too much RAM. I want to reduce the RAM usage. I don't have experience with Varnish. It's said to be faster. I don't know how Varnish works. So, How much RAM needed for running Apache2+Varnish? Will Apache2+Varnish have higher RAM usage… >>> More
Varnish VCL Reload Fails After Adding Second Backend

as seen on Server Fault - Search for 'Server Fault'
I have been running Varnish on my production server successfully for several weeks now. Now I'm trying to configure Varnish to use a second backend for certain requests. My original working VCL (/etc/varnish/default.vcl) begins like this: backend default { .host = "127.0.0.1"; .port = "8080"; } … >>> More
Nginx, Varnish, ESI - Will that work?

as seen on Server Fault - Search for 'Server Fault'
I've serveral backends (one is nginx+passenger) to combine via ESI. Since I don't want to go without gzip/deflate and SSL varnish can't do the job out of the box. So I thought about the following setup: http://img693.imageshack.us/img693/38/esinginx.png What do you think? overkill? >>> More