kustomize/site/content/en/api-reference/kustomization/replicas/_index.md

title, linkTitle, type, description

title	linkTitle	type	description
replicas	replicas	docs	Change the number of replicas for a resource.

Given this kubernetes Deployment fragment:

# deployment.yaml
kind: Deployment
metadata:
  name: deployment-name
spec:
  replicas: 3

one can change the number of replicas to 5 by adding the following to your kustomization:

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

replicas:
- name: deployment-name
  count: 5

This field accepts a list, so many resources can be modified at the same time.

As this declaration does not take in a kind: nor a group: it will match any group and kind that has a matching name and that is one of:

• Deployment
• ReplicationController
• ReplicaSet
• StatefulSet

For more complex use cases, revert to using a patch.