[rabbitmq-discuss] Specifying channel_max

Simon MacMullen simon at rabbitmq.com
Fri Jan 27 16:06:04 GMT 2012

On 27/01/12 16:00, Dan Dart wrote:
> We're after being able to increase channel_max so that Rabbit can
> handle more and not give us errors about not having enough channel
> ids.
> According to Rabbit documentation on AMQP:

This controls the number of channels allowed per single TCP connection. 
RabbitMQ by default will negotiate a channel_max of 65535 (and in fact 
AMQP won't allow more, it's an unsigned short).

But this is a very rare limit to run into. Are you running into a limit 
on the number of *connections* you can open? This is affected by the 
number of file descriptors available to the user running RabbitMQ - for 
example, on a Debian based system you'll need to edit 

Cheers, Simon

Simon MacMullen
RabbitMQ, VMware

More information about the rabbitmq-discuss mailing list