Forum: NGINX upstream: grant recovery time to backend server

Hello,

i have a load balancing setup running with nginx in front and 2 tomcats 
as
backend:

upstream backend  {
  ip_hash;
  server 192.168.1.100;
  server 192.168.1.101;
}

Runs fine so far, but from time to time one of the tomcats crashes and 
needs
to be restarted. As soon as nginx notices that the tomcat is coming up,
nginx starts to forward requests to the starting-up tomcat. But it would 
be
better that the tomcat starts up completly before nginx starts sending
requests to it.

Is there any possibility to grant a recovery time to a backend server 
before
the backend receives requests? I.e. something like "nginx: hey, i 
noticed
that the formerly crashed backend server is coming up, but i'll wait 
300s
before sending requests to it"?


thx in advance
revirii

Posted at Nginx Forum: 
http://forum.nginx.org/read.php?2,231854,231854#msg-231854

Hello!

On Tue, Oct 16, 2012 at 06:21:00AM -0400, revirii wrote:

>
> Runs fine so far, but from time to time one of the tomcats crashes and needs
> to be restarted. As soon as nginx notices that the tomcat is coming up,
> nginx starts to forward requests to the starting-up tomcat. But it would be
> better that the tomcat starts up completly before nginx starts sending
> requests to it.
>
> Is there any possibility to grant a recovery time to a backend server before
> the backend receives requests? I.e. something like "nginx: hey, i noticed
> that the formerly crashed backend server is coming up, but i'll wait 300s
> before sending requests to it"?

Don't open listen sockets on a backend server unless you think
it's started and ready to handle requests?

--
Maxim Dounin
http://nginx.com/support.html