Networking

Firewall

Create firewall rules for your nodes, so they can communicate with each other. Refer to the ports guide https://microk8s.io/docs/ports

sudo firewall-cmd --permanent --add-port=6443/tcp			# Kube API server
sudo firewall-cmd --permanent --add-port=2379-2380/tcp		# etcd
sudo firewall-cmd --permanent --add-port=10250/tcp			# kubelet
sudo firewall-cmd --permanent --add-port=10251/tcp			# kube-scheduler
sudo firewall-cmd --permanent --add-port=10252/tcp			# kube-controller-manager
sudo firewall-cmd --permanent --add-port=10255/tcp
sudo firewall-cmd --permanent --add-port=25000/tcp			# microk8s cluster
sudo firewall-cmd --permanent --add-port=19001/tcp
sudo firewall-cmd --permanent --add-port=4789/udp			# Calico with VXLAN 
sudo firewall-cmd --permanent --add-port=5473/tcp			# Calico with Typha
sudo firewall-cmd --permanent --add-port={8285,8472}/udp	# Flannel
sudo firewall-cmd --add-masquerade --permanent
sudo firewall-cmd --zone=trusted --add-interface=vxlan.calico --permanent
sudo firewall-cmd --permanent --add-port=30000-32767/tcp	# NodePorts on control plane IP
sudo firewall-cmd --reload

Or the cheat way:

# Fedora
sudo systemctl disable --now firewalld

# Ubuntu
sudo ufw disable