Modifying a deployment without editing the file manually

Question

I created a deployment for my application:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: myapp1
spec:
  replicas: 2
  template:
    metadata:
      labels:
        app: myapp
    spec:
      containers:
      - name: myapp
        image: 172.20.34.206:5000/myapp_img:2.0
        ports:
        - containerPort: 8080

Now to do a rolling update I do this:

1. $ kubectl edit deployment/myapp1
2. editor opens and I change the image version and save

Can this be automated? Can I do it just by running a command instead of opening, saving and deploying again? Eg:

$ kubectl edit deployment/myapp1 --image=172.20.34.206:5000/myapp:img:3.0

I thought using Kubernetes API REST but I don't understand the documentation.

Answer 1

You can try kubectl patch to do this:

kubectl patch deployment myapp-deployment -p \
  '{"spec":{"template":{"spec":{"containers":[{"name":"myapp","image":"172.20.34.206:5000/myapp:img:3.0"}]}}}}'

YAML format is also accepted here. Also check out Kubernetes issue #458. You can also try using the PATCH verb via the REST API.