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Oracle Linux Training Station

Scale an Oracle Cloud Native Environment Cluster

ocne2 lab tutorial ocne-install
Table of Contents

Links

🌙 Lab

🗒 Tutorial

Details

Scaling up a Kubernetes cluster means adding nodes; likewise, scaling down occurs by removing nodes. These nodes can be either control plane or worker nodes. Oracle recommends against scaling the cluster up and down simultaneously but instead performing a scale up and down in two separate commands.

Scaling the Kubernetes cluster control plane or worker nodes in odd numbers is recommended to avoid split-brain scenarios and maintain the quorum. For example, 3, 5, or 7 control plane nodes or worker nodes ensure the cluster’s reliability.

Objectives

In this tutorial, you’ll learn how to use kubectl scale and kubectl edit to:

  • Add a new control plane and worker nodes to a Kubernetes cluster
  • Remove control plane nodes and worker nodes from a Kubernetes cluster

Prerequisites

  • Minimum of one Oracle Linux instance

    • Runs ocne and libvirt ephemeral cluster

  • OCI cluster creation requires access to the following resources in an Oracle Cloud Infrastructure tenancy:

    • Virtual cloud network with four subnets
    • Network load balancer
    • Object Storage bucket with minimum 5 GiB available
    • Compute Custom Image
    • Compute Arm Shape for the control plane node
      • VM.Standard.A1.Flex with two OCPU and 12 memory
    • Compute for each additional control plane and worker node
      • VM.Standard.E4.Flex with four OCPU and 64 memory