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How to use environmental value inisde kubernetes yaml file

I have one kubernetes deployment file for e.g:

I want that image_tag is passed at the command line when running the kubectl create -f deployment.yaml command. and suppose i did the export IMAGE_TAG=1.4.3 and want to use that ENV variable value is inserted at the position of image tag.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx
    spec:
     containers:
     - name: nginx
       image: nginx:{IMAGE_TAG}
    ports:
     - containerPort: 80
Solution

  • I do this:

    sed -i "s/{IMAGE_TAG}/${IMAGE_TAG}/" deployment.yml
kubectl apply -f deployment.yml

    as it is not supported by kubectl