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OpenShift Multi-Cluster Management Handbook

You're reading from   OpenShift Multi-Cluster Management Handbook Go from architecture to pipelines using GitOps

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Product type Paperback
Published in Nov 2022
Publisher Packt
ISBN-13 9781803235288
Length 458 pages
Edition 1st Edition
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Authors (2):
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Rafael Pecora Rafael Pecora
Author Profile Icon Rafael Pecora
Rafael Pecora
Giovanni Fontana Giovanni Fontana
Author Profile Icon Giovanni Fontana
Giovanni Fontana
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Toc

Table of Contents (23) Chapters Close

Preface 1. Part 1 – Design Architectures for Red Hat OpenShift
2. Chapter 1: Hybrid Cloud Journey and Strategies FREE CHAPTER 3. Chapter 2: Architecture Overview and Definitions 4. Chapter 3: Multi-Tenant Considerations 5. Chapter 4: OpenShift Personas and Skillsets 6. Part 2 – Leverage Enterprise Products with Red Hat OpenShift
7. Chapter 5: OpenShift Deployment 8. Chapter 6: OpenShift Troubleshooting, Performance, and Best Practices 9. Chapter 7: OpenShift Network 10. Chapter 8: OpenShift Security 11. Part 3 – Multi-Cluster CI/CD on OpenShift Using GitOps
12. Chapter 9: OpenShift Pipelines – Tekton 13. Chapter 10: OpenShift GitOps – Argo CD 14. Chapter 11: OpenShift Multi-Cluster GitOps and Management 15. Part 4 – A Taste of Multi-Cluster Implementation and Security Compliance
16. Chapter 12: OpenShift Multi-Cluster Security 17. Chapter 13: OpenShift Plus – a Multi-Cluster Enterprise Ready Solution 18. Chapter 14: Building a Cloud-Native Use Case on a Hybrid Cloud Environment 19. Part 5 – Continuous Learning
20. Chapter 15: What’s Next 21. Index 22. Other Books You May Enjoy

Network isolation

Firewalls are well known and have been used for a long time in any kind of infrastructure. When it comes to OpenShift, we need to have in mind that we are now working with a software-defined platform and, as such, we have software features to implement some of the same concepts we have had for a long time in a data center—it is no different with a firewall. As we have seen in the previous chapter, Network Policies are nothing more than rules you define to allow or block network communication between pods and projects on OpenShift, similar to what a firewall provides in a physical network.

By default, all pods in a project are accessible from other pods and network endpoints from any project. To isolate pods and projects, you need to create network policies, such as the following:

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: deny-by-default
spec:
  podSelector: {}
  ingress: []

The previous network...

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