Well it's a microservice as described in the OP, I'm just talking about formalizing a communication method. Reading CLI responses isn't a very smart way to do

Well it's a microservice as described in the OP, I'm just talking about formalizing a communication method. Reading CLI responses isn't a very smart way to do it. REST APIs aren't really ideal for slow processes, either, which is why my first thought would be something like RabbitMQ or just a simple TCP connection.