Scale down Kubernetes pods
I am using
kubectl scale --replicas=0 -f deployment.yaml
to stop all my running pods. Please let me know if there are better ways to bring down all running pods to Zero keeping configuration, deployments etc.. intact, so that I can scale up later as required.
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6 Answers
If you need more granularity with pipes or grep, here is another shell solution:
for i in $(kubectl get deployments | grep -v NAME | grep -v app | awk '{print $1}'); do kubectl scale --replicas=2 deploy $i; doneYou are doing the correct action; traditionally the scale verb is applied just to the resource name, as in kubectl scale deploy my-awesome-deployment --replicas=0, which removes the need to always point at the specific file that describes that deployment, but there's nothing wrong (that I know of) with using the file if that is more convenient for you.
Here we go. Scales down all deployments in a whole namespace:
kubectl get deploy -n <namespace> -o name | xargs -I % kubectl scale % --replicas=0 -n <namespace>To scale up set --replicas=1 (or any other required number) accordingly
If you want generic patch:
namespace=devops-ci-dev
kubectl get deployment -n ${namespace} --no-headers| awk '{print $1}' | xargs -I elhay kubectl patch deployment -n ${namespace} -p '{"spec": {"replicas": 1}}' elhay Change namespace=devops-ci-dev, to be your name space.
kubectl get deployments
NAME READY UP-TO-DATE AVAILABLE AGE
app-gke 3/3 3 3 13m
kubectl scale deploy app-gke --replicas=5
deployment.extensions/app-gke scaled
kubectl get pods
NAME READY STATUS RESTARTS AGE
app-gke-7b768cd6d7-b25px 2/2 Running 0 11m
app-gke-7b768cd6d7-glj5v 0/2 ContainerCreating 0 4s
app-gke-7b768cd6d7-jdt6l 2/2 Running 0 11m
app-gke-7b768cd6d7-ktx87 2/2 Running 0 11m
app-gke-7b768cd6d7-qxpgl 0/2 ContainerCreating 0 4s
The solution is pretty easy and straightforward
kubectl scale deploy -n <namespace> --replicas=0 --all