How to make OpenVPN work next door to Docker?

Question

openvpn

Greetings. The problem is the following.

I bet on a clean VDS'ku OpenVPN. I forward iptables so that everyone connected to OpenVPN has Internet and that computers inside the network can see each other

iptables -I FORWARD -i tun0 -o ens3 -j ACCEPT
iptables -I FORWARD -i ens3 -o tun0 -j ACCEPT
iptables -t nat -A POSTROUTING -o ens3 -j MASQUERADE

Next, I install Docker, roll up a couple of applications. Everything is working.
As soon as the server is rebooted, the rules for iptables described above die (save iptables does not help, ahem...). If there were no Docker on the server, I would just fill in the rules again, and OpenVPN would work as expected, but with Docker on board, these rules are ignored for some reason. As soon as I roll back iptables to the factory settings and write rules for OpenVPN, OpenVPN starts working like clockwork.
I believe that Docker's rules are somehow interfering with OpenVPN. How can you "friend" them?

Answer 1

save iptables doesn't help, hmm...

how do you do it? like this: https://linuxconfig.org/how-to-make-iptables-rules...

Answer 2

You can prevent docker from managing the firewall, but you will have to enter the rules for containers yourself.