This is by far one of the biggest issues I have had trying to scour the internet looking for a good way to deal with Docker and my hosts firewall. I have spent DAYS souring the internet trying to find someone who has solved this problem, because I know they have solved this problem. If there is one rule I have always lived by with the internet age, if you have come across a problem, it is almost guaranteed someone else had the same problem and came up with a solution.
I have tried using UFW, after all it is called Uncomplicated Fire Wall, you would think it would be uncomplicated. But while the solution I found for my firewall worked on some of my hosts, it didn’t work on all of them. For interest, this was the solution I came across for UFW.
Why didn’t the above solution work for me? Well it did work, there was just 1 massive flaw. When I enabled UFW, I was getting timeouts and extremely slow page loads with my Nginx webserver. I tried scouring the web looking for a reason as to why this was happening, and sadly no one had this problem before, or at least it was such an uncommon problem the answer is buried somewhere on the internet. I did say “almost guaranteed” someone else had the same problem.