Merge pull request #485 from mlittlec/main

Add OCNE Scale post

Author: mlittlec

content/posts/ocne/post-44/featured.png

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+---
+title: "Scale an Oracle Cloud Native Environment Cluster"
+date: 2024-12-18
+draft: false
+summary: "Learn how to configure cluster scaling on Oracle Cloud Native Environment."
+tags: ["ocne2", "lab", "tutorial", "ocne-install"]
+showDate: true
+---
+
+## Links
+
+:crescent_moon: [Lab](https://luna.oracle.com/lab/9d258745-5ca3-4e5a-9467-66be43d12a8a)
+
+:spiral_notepad: [Tutorial](https://docs.oracle.com/en/learn/ocne2-scale)
+
+## 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