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The DevOps 2.3 Toolkit

You're reading from   The DevOps 2.3 Toolkit Kubernetes: Deploying and managing highly-available and fault-tolerant applications at scale

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Product type Paperback
Published in Sep 2018
Publisher Packt
ISBN-13 9781789135503
Length 418 pages
Edition 1st Edition
Concepts
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Author (1):
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Viktor Farcic Viktor Farcic
Author Profile Icon Viktor Farcic
Viktor Farcic
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Toc

Table of Contents (18) Chapters Close

Preface 1. How Did We Get Here? FREE CHAPTER 2. Running Kubernetes Cluster Locally 3. Creating Pods 4. Scaling Pods With ReplicaSets 5. Using Services to Enable Communication between Pods 6. Deploying Releases with Zero-Downtime 7. Using Ingress to Forward Traffic 8. Using Volumes to Access Host's File System 9. Using ConfigMaps to Inject Configuration Files 10. Using Secrets to Hide Confidential Information 11. Dividing a Cluster into Namespaces 12. Securing Kubernetes Clusters 13. Managing Resources 14. Creating a Production-Ready Kubernetes Cluster 15. Persisting State 16. The End 17. Other Books You May Enjoy

Communicating between Namespaces

We'll create an alpine-based Pod that we'll use to demonstrate communication between Namespaces.

kubectl config use-context minikube
    
kubectl run test --image=alpine \
    --restart=Never sleep 10000

We switched to the minikube context (default Namespace) and created a Pod with a container based on the alpine image. We let it sleep for a long time. Otherwise, the container would be without a process and would stop almost immediately.

Before we proceed, we should confirm that the Pod is indeed running.

kubectl get pod test  

The output is as follows:

NAME READY STATUS  RESTARTS AGE
test 1/1   Running 0        10m  

Please wait a few moments if, in your case, the Pod is not yet ready.

Before we proceed, we'll install curl inside the container in the test Pod.

kubectl exec -it test \
    -- apk add -U curl  

We already explored...

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