1. Setup your Nodes [OCNE 1.7]

We need a minimum of 3 nodes to setup OCNE namely :

1. Operator Node:
   - Install and manage the environment and Kubernetes cluster.
   - Has the following components :
   * Platform CLI (olcnectl).
   * Platform API Server.
   - Minimum Hardware Requirements:
   * 1 CPU cores (Intel VT-capable CPU)
   * 8GB RAM
   * 1GB Ethernet NIC
   * 15GB hard disk space in the /var directory
2. Kubernetes ControlPlane Node:
   - Manage the lifecycle of containerized applications.
   - Has the following components :
   * Platform Agent.
   * Kubernetes API Server.
   * Kubernetes CLI (kubectl).
   - Minimum Hardware Requirements:
   * 4 CPU cores (Intel VT-capable CPU)
   * 16GB RAM
   * 1GB Ethernet NIC
   * XFS file system (the default file system for Oracle Linux)
   * 40GB hard disk space in the /var directory
3. Kubernetes Worker Nodes:
   - Hosts the containerized applications.
   - Has the following components :
   * Platform Agent.
   * Container Runtime engine.
   - Minimum Hardware Requirements:
   * 1 CPU cores (Intel VT-capable CPU)
   * 8GB RAM
   * 1GB Ethernet NIC
   * XFS file system (the default file system for Oracle Linux)
   * 15GB hard disk space in the /var directory
   * XFS mount-point /var/lib/containers with dedicated space based on the number of container images going to be saved and leveraged.

NOTE :

• The minimum HA configuration for Kubernetes cluster is :
  1 Operator Node
  3 Kubernetes Control Plane nodes (5 recommended)
  2 Kubernetes worker nodes (3 recommended)
• The number of control plane nodes must be an odd number equal to or greater than 3, Eg: 3,5 or 7 …

Step 1: Update Oracle Linux (Optional)

sudo dnf -y update
sudo reboot

Step 2: Setup meaningful hostnames and map the IP and hostnames in /etc/hosts file (Optional)

hostnamectl set-hostname operator.xx.xxx.com 
hostnamectl set-hostname control.xx.xxx.com
hostnamectl set-hostname worker1.xx.xxx.com 
hostnamectl set-hostname worker2.xx.xxx.com

vi /etc/hosts

10.65.xx.xxx control.xx.xxx.com control 
10.65.xx.xxx operator.xx.xxx.com operator 
10.65.xx.xxx worker1.xx.xxx.com worker1
10.65.xx.xxx worker2.xx.xxx.com worker2