How do I resolve this overlay2 issue (ELI5)

Now, I am not a docker expert, and I only got docker as part of ucrm install. Now, we have a huge problem concerning storage space. Docker is consuming hard disk space faster than anything else, and I don't know how to get it under control. When I dug around a bit, I discovered overlay2 was pretty much consuming everything, and, pruning did not do much. I have just backed up UCRM, but, my problem is simple. How do I stop overlay2 from being this ridiculously big? Is there a control? I've gone through many guides online, and its just gibberish to be honest, not that the guys have done anything wrong, its just way to complicated. Anyone have a very very easy simplified approach to resolving my issue?

Debian 9.7

Docker version 18.09.1, build 4c52b90


submitted by /u/nicgentile
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