Kubernetes: kubeadm

Creating a cluster with kubeadm

Kubernetes Documentation: Cluster Installation With kubeadm

Overview:

• Run kubeadm init on the primary control node.
• Create a network.
• Run kubeadm join on worker nodes and redundant master nodes.

kubeadm-upgrade

Kubernetes Documentation: Upgrading kubeadm clusters

Overview:

• Upgrade the primary control node.
• Upgrade additional control nodes.
• Upgrade worker nodes.

Requirements:

• Kubernetes version 1.18.0 or later.
• Swap must be disabled.
• Static control plane and etcd pods or external etcd.

Recommendations:

• Read the release notes.
• Check back-ups.

Turning swap off:

• List devices: cat /etc/swaps.
• Turn off all swap devices and files: swapoff -a.
• Remove any matching references found in /etc/fstab.

Remove cluster info after deleting a node from the cluster

kubeadm reset

• Residual iptables rules may be left.