atom feed21 messages in ru.sysoev.nginxRe: Switching backends based on a cookie
FromSent OnAttachments
saltyfloridaJan 28, 2010 3:42 pm 
Marcus ClyneJan 28, 2010 4:03 pm 
merlin coreyJan 28, 2010 4:23 pm 
merlin coreyJan 28, 2010 4:25 pm 
Marcus ClyneJan 28, 2010 4:48 pm 
saltyfloridaJan 28, 2010 5:50 pm 
saltyfloridaJan 28, 2010 6:00 pm 
Piotr SikoraJan 28, 2010 6:06 pm 
Piotr SikoraJan 28, 2010 6:14 pm 
saltyfloridaJan 28, 2010 6:18 pm 
saltyfloridaJan 28, 2010 6:19 pm 
Marcus ClyneJan 28, 2010 6:49 pm 
saltyfloridaJan 28, 2010 11:04 pm 
saltyfloridaJan 28, 2010 11:13 pm 
Marcus ClyneJan 29, 2010 2:54 am 
merlin coreyJan 29, 2010 9:38 am 
Laurence RoweJan 29, 2010 11:19 am 
Marcus ClyneJan 29, 2010 3:01 pm 
Laurence RoweJan 30, 2010 10:46 am 
Marcus ClyneJan 30, 2010 4:00 pm 
saltyfloridaFeb 2, 2010 9:30 pm 
Subject:Re: Switching backends based on a cookie
From:Laurence Rowe (l@lrowe.co.uk)
Date:Jan 29, 2010 11:19:30 am
List:ru.sysoev.nginx

I would take a look at HAProxy which has better support for this use case, allowing for requests to be retried against another server if their associated backend is down.

Laurence

2010/1/29 Marcus Clyne <ngx.@gmail.com>:

Hi,

saltyflorida wrote:

Is it possible to switch backend clusters of servers based on a cookie?

I would like to set a cookie named "env" and do something like this:

       if ($http_cookie ~* "env=testing(;|$)") {            proxy_pass http://backend_testing;        }        if ($http_cookie ~* "env=staging(;|$)") {            proxy_pass http://backend_staging;        }        if ($http_cookie ~* "env=production(;|$)") {            proxy_pass http://backend_production;        }

However the "proxy_pass" directive is not allowed inside an "if". Is there another way I can approach this?

Take a look at the map module :

http://wiki.nginx.org/NginxHttpMapModule

One possibility would be :

http {

map  $cookie_env  $backend {

  testing      http://backend_testing;   staging      http://backend_staging;   production   http://backend_production; }

server {   ...   proxy_pass   $backend;

}

}

Marcus.

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