Docker inter-container communication with firewalld

Question

I'm trying to install ansible awx 17.1.0 on a Fedora 33 Server.

The install process creates a few docker containers which need to communicate with each other. With firewalld enabled, this does not work.

It works with firewalld disabled (but that's not the point).

So far, I've tried:

• adding the docker0 bridge to trusted (by default it's in the docker zone - which doesn't work either):

  firewall-cmd --permanent --zone=trusted --change-interface=docker0

• firewall-cmd --zone=public --add-masquerade --permanent

• adding the ip ranges of the docker network to trusted:

  firewall-cmd --permanent --zone=trusted --add-source=10.17.0.0/16

None of which seemed to do the trick. (In between I ran firewall-cmd --reload and systemctl restart docker.)

Docker seems to create another bridge br-somecharacters everytime I try to run the installer and increments the network 10.XX.0.0/16 by one everytime.

How do I properly enable inter-container traffic with firewalld?