Disable Docker's iptables and use UFW

instructions.md

Disable Docker's iptables

CentOS 7

sudo mkdir /etc/systemd/system/docker.service.d
sudo nano /etc/systemd/system/docker.service.d/iptables-disabled.conf

Put this config on it

ExecStart=
ExecStart=/usr/bin/dockerd -H fd:// --iptables=false

sudo systemctl daemon-reload
sudo systemctl restart docker

Ubuntu

sudo nano /etc/default/docker 

And add this line

DOCKER_OPTS="--iptables=false"

Restart

sudo systemctl restart docker

Use ufw

CentOS

sudo yum install -y ufw

Stop and disabled firewalld

sudo systemctl stop firewalld
sudo systemctl disable firewalld

Check it is stopped

sudo firewall-cmd --state