How can I lock applications using RabbitMQ and AMQP

Question

I need to lock one of the instances to allow scheduling for multiinstances web application

Right now we have two started instances of application. Each has scheduler of work. I need to avoid double run the same process because both of instances send message of the same processing

Answer 1

Don't try and do distributed locking, it's a really hard problem to try and solve.

Instead, just set up your two applications to consume from the same queue and have RabbitMQ round-robin messages between them, and then neither will conflict with the work the other one is doing.