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Introduction to DevOps with Kubernetes

You're reading from   Introduction to DevOps with Kubernetes Build scalable cloud-native applications using DevOps patterns created with Kubernetes

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Product type Paperback
Published in May 2019
Publisher
ISBN-13 9781789808285
Length 374 pages
Edition 1st Edition
Languages
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Authors (2):
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Süleyman Akbaş Süleyman Akbaş
Author Profile Icon Süleyman Akbaş
Süleyman Akbaş
Onur Yılmaz Onur Yılmaz
Author Profile Icon Onur Yılmaz
Onur Yılmaz
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Toc

Table of Contents (11) Chapters Close

Preface 1. Chapter 1: Introduction to DevOps FREE CHAPTER 2. Chapter 2: Introduction to Microservices and Containers 3. Chapter 3: Introduction to Kubernetes 4. Chapter 4: Creating a Kubernetes Cluster 5. Chapter 5: Deploy an Application to Kubernetes 6. Chapter 6: Configuration and Storage Management in Kubernetes 7. Chapter 7: Updating and Scaling an Application in Kubernetes 8. Chapter 8: Troubleshooting Applications in Kubernetes 9. Chapter 9: Monitoring Applications in Kubernetes Appendix

Chapter 4: Creating a Kubernetes Cluster

Activity 4: Migrating a Running Application in Kubernetes Cluster

Solution:

Perform the following steps to complete this activity:

  1. Run a sample web application with six replicas in the cluster:
    kubectl run hello-world --image=gcr.io/google-samples/hello-app:1.0 --replicas=6
    Figure 4.30: Creating hello-world application
  2. Check the status of pods of the sample web application and their nodes:
    kubectl get pods -o wide
    Figure 4.31: Pods and their nodes of the hello-world application
  3. Create a node pool in GCP with a larger memory:
    gcloud container node-pools create high-memory-pool --cluster=devops \
      --machine-type=n1-highmem-2 --num-nodes=2

    Figure 4.32: Node pool creation
    Figure 4.32: Node pool creation
  4. Wait until all nodes are Ready in the cluster:
    kubectl get nodes --label-columns=beta.kubernetes.io/instance-type
    Figure 4.33: Kubernetes nodes after pool creation
  5. Mark the nodes in the default node pool as unschedulable and make Kubernetes move the workloads...
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