OpenShift Overview

Introduction to OpenShift

• Presenter: Sai Vennam, Developer Advocate at IBM
• OpenShift: A platform for running containerized applications powered by Kubernetes.
• **Key Components: **
  • Open Source: OKD (Origin Community Distribution) can be used for free.
  • Commercial Offering: OpenShift with Red Hat support available in multiple flavors.

Architecture of OpenShift

• Resources: Can run on public/private, bare metal or virtualized hardware (on-prem or cloud).
• Operating System: Primarily Red Hat Enterprise Linux; CentOS for OKD.
• Kubernetes: Serves as the foundational layer.
• OpenShift: Simplifies working with Kubernetes.
  • Provides web console and CLI for easier operations.

Benefits for Developers

• Workflow for Developer:
  • Create Project/Application: Can use:
    • CLI
    • Web Console
  • Templates available for various programming languages.
  • Code Commit Process:
    • Push changes to a repository (e.g., GitHub).
    • CI/CD with Jenkins: Automatically set up by OpenShift to:
      • Create Docker images from source code.
      • Store images in a built-in private registry (supports public/other registries).
  • Deployment:
    • Image is deployed to the cluster, e.g., two hosts (v1 of the application).
    • Image Streams: Allows for zero-downtime updates by managing version rollouts seamlessly.

Benefits for Operations Engineers

• Key Responsibilities:
  • Maintain high availability and infrastructure health.
  • Utilize the web console and CLI to monitor and ensure availability.
• Scaling Processes:
  • Scaling up hosts: Can use Ansible Playbooks to automate tasks like host additions to the cluster.

Conclusion

• OpenShift enhances productivity for developers and simplifies operations for engineers.
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