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:

$ kubectl edit deployment/myapp1

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.