[rabbitmq-discuss] Changing file descriptor limit wihtout restart?

[Jakov Sosic]

On 07/07/2014 11:35 AM, Simon MacMullen wrote:

> It's not Erlang, it's RabbitMQ. The problem is that the file handle
> cache (the component which manages file descriptors inside the broker)
> only checks the limit at startup.
>
> But you can tell it the limit has changed with something like:
>
> $ rabbitmqctl eval 'file_handle_cache:set_limit(4096).'
>
> BIG FAT WARNING:
>
> This number is not validated; it's taken entirely on trust. If you tell
> the FHC that it has a larger limit than the one the OS will enforce, you
> can run out of file descriptors and crash the server.



That will increase "Network sockets count and limit managed by 
RabbitMQ". File descriptor count stays hard locked at 1024.