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Kubernetes for Developers

You're reading from   Kubernetes for Developers Use Kubernetes to develop, test, and deploy your applications with the help of containers

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Product type Paperback
Published in Apr 2018
Publisher Packt
ISBN-13 9781788834759
Length 374 pages
Edition 1st Edition
Languages
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Author (1):
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Joseph Heck Joseph Heck
Author Profile Icon Joseph Heck
Joseph Heck
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Table of Contents (12) Chapters Close

Preface 1. Setting Up Kubernetes for Development FREE CHAPTER 2. Packaging Your Code to Run in Kubernetes 3. Interacting with Your Code in Kubernetes 4. Declarative Infrastructure 5. Pod and Container Lifecycles 6. Background Processing in Kubernetes 7. Monitoring and Metrics 8. Logging and Tracing 9. Integration Testing 10. Troubleshooting Common Problems and Next Steps 11. Other Books You May Enjoy

Declaring your first application


Go ahead and pick one of the examples and create a deployment declaration, and try creating one using the declaration.

I recommend making a directory called deploy, and putting your declaration file within that. This is using the flask example:

flask.yml
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: flask
  labels:
    run: flask
spec:
  template:
    metadata:
      labels:
         app: flask
    spec:
      containers:
      - name: flask
        image: quay.io/kubernetes-for-developers/flask:0.1.1
        ports: 
        - containerPort: 5000

Remove the existing deployment before you try out your file:

kubectl delete deployment flask

It is a good practice to use the --validate option to have kubectl check the files, and you can use it with --dry-run to compare the file to anything existing in Kubernetes to let you know specifically what it will be doing.  YAML is easy to read, and unfortunately even easier to make formatting mistakes due to its...

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