How to create a daemon administration system?

Question

Payment systems

There is a task - to create a system that could conveniently manage the "army" of processes. Those. there is a program that writes something, reads something from the database in an endless loop, and it must be multiplied, say, by 1000 identical processes. It is necessary to be able to start, stop, change the number of processes, request their status. As a matter of fact the control system of demons is necessary. I know that there should be ready-made architectural solutions, but I just can’t google them. Could you tell me how it can be done architecturally and technically? Links to patterns or specific implementations are welcome.