OpenShift Architecture

Component Overview

The OpenShift deployment consists of several key components:

1. DRP Control Node

   • Manages cluster deployment
   • Handles node provisioning
   • Coordinates cluster formation
   • Optional DNS management

2. Load Balancers

   • Entry point for cluster access
   • Routes API and application traffic
   • Handles high availability needs

3. Bootstrap Node

   • Temporary control plane
   • Initializes cluster configuration
   • Converts to worker node after initialization

4. Control Plane Nodes

   • Manage cluster state
   • Run etcd database
   • Handle API requests
   • Schedule workloads

5. Worker Nodes

   • Run application workloads
   • Scale based on demand
   • Handle pod networking
   • Provide compute resources

Network Architecture

Three distinct network ranges:

1. Machine Network (172.21.0.0/20)

   • Physical node addressing
   • Infrastructure services
   • Must be routable

2. Service Network (172.30.0.0/16)

   • Kubernetes services
   • Internal load balancing
   • Not externally routable

3. Pod Network (10.128.0.0/14)

   • Container workloads
   • Pod-to-pod communication
   • Managed by OVN-Kubernetes