sudo firewall-cmd --state
sudo systemctl stop firewalld
sudo systemctl disable firewalld
sudo systemctl mask --now firewalld
sudo firewall-cmd --state
sudo systemctl stop firewalld
sudo systemctl disable firewalld
sudo systemctl mask --now firewalld
# Add Docker's official GPG key: sudo apt-get update sudo apt-get install ca-certificates curl sudo install -m 0755 -d /etc/apt/keyring...