kamel scale integration to zero not possible

[davsclaus]

If you just want to scale a integration to zero (eg to stop it) then the operator will start it afterwards, so you can only delete it

kamel run --name polyglot routes.xml beans.groovy JavaRoute.java

kubectl scale deployment --replicas=0 polyglot

And then the operator creates a new polyglot integration, when k8s has scaled it down

Maybe we need a command on kamel so you can stop an integration, either via scale

kamel scale --replicas=0 polyglot

[nicolaferraro]

I think we support scaling via oc or kubectl iirc (@astefanutti).

kubectl scale it polyglot --replicas 0

[astefanutti]

Yes, it's possible to scale the integration either with:

$ kubectl scale it polyglot --replicas 0

Or:

$ kubectl patch it polyglot --type='merge' -p '{"spec":{"replicas":"0"}}'

For some reasons (concurrency control IIRC), kubectl scale mandates to have the .spec.replicas already set for it to work. So you can use the latter command to set the field initially, or use kubectl edit it polyglot alternatively.

[davsclaus]

I tried the first command above and then the kamel k operator sees the "change" and then start another pod with the integration. eg the operator dont know it was scaled down on purpose.

[astefanutti]

There is a bug with a recent change done in the GC trait that comes into the way of rescaling. I'm working on a PR right now that should fix the issue.