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Kubernetes basics

Instruction

Control plane vs worker nodes

Control Plane:

  • The control plane is installed on your master node
  • Can be both a control plane node and a worker node
  • It houses the API server, scheduler, and controller manager settings

Worker Nodes:

  • This is where the kubelet and kube-proxy are installed
  • You can use the kubeadm join command to join workers to the master node to form the cluster

Common commands

kubectl

kubectl get nodes
kubectl get pods
kubectl get all -A

Networking

Inbound Rules for K3s Nodes
Protocol Port Source Destination Description TCP 2379-2380 Servers Servers Required only for HA with embedded etcd TCP 6443 Agents Servers K3s supervisor and Kubernetes API Server UDP 8472 All nodes All nodes Required only for Flannel VXLAN TCP 10250 All nodes All nodes Kubelet metrics UDP 51820 All nodes All nodes Required only for Flannel Wireguard with IPv4 UDP 51821 All nodes All nodes Required only for Flannel Wireguard with IPv6 TCP 5001 All nodes All nodes Required only for embedded distributed registry (Spegel) TCP 6443 All nodes All nodes Required only for embedded distributed registry (Spegel)

Typically, all outbound traffic is allowed.

 

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