install-docker-on-centos8.sh

The podman and buildah packages conflict with docker-ce. Remove them first:
yum erase podman buildah

https://unix.stackexchange.com/questions/611228/getting-series-of-file-conflicts-like-runc-and-containerd-when-trying-to-install


https://www.linuxtechi.com/install-docker-ce-centos-8-rhel-8/
dnf update -y ; reboot
dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
dnf list docker-ce
dnf install docker-ce --nobest -y
systemctl start docker
systemctl enable docker
docker --version


# Allows container to container communication, the solution to the problem
firewall-cmd --zone=public --add-masquerade --permanent

# standard http & https stuff
firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --zone=public --add-port=443/tcp --permanent
# + any other port you may need

# reload the firewall
firewall-cmd --reload