Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Arrow up icon
GO TO TOP
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

Arrow left icon
Product type Paperback
Published in Sep 2018
Publisher Packt
ISBN-13 9781789135503
Length 418 pages
Edition 1st Edition
Concepts
Arrow right icon
Author (1):
Arrow left icon
Viktor Farcic Viktor Farcic
Author Profile Icon Viktor Farcic
Viktor Farcic
Arrow right icon
View More author details
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...

lock icon The rest of the chapter is locked
Register for a free Packt account to unlock a world of extra content!
A free Packt account unlocks extra newsletters, articles, discounted offers, and much more. Start advancing your knowledge today.
Unlock this book and the full library FREE for 7 days
Get unlimited access to 7000+ expert-authored eBooks and videos courses covering every tech area you can think of
Renews at $19.99/month. Cancel anytime
Banner background image