Patches Dictionary

Source: https://notes.kodekloud.com/docs/CKA-Certification-Course-Certified-Kubernetes-Administrator/Kustomize-Basics-2025-Updates/Patches-Dictionary/page

Summary: Learn to update, add, and remove keys in Kubernetes Deployment configurations using JSON 6902 patches and strategic merge patches with practical examples.

Related Notes

• KodeKloud CKA Index
• CKA Index
• Previous: Overlays
• Next: Patches Intro

Key Notes

• In this article, you’ll learn how to update, add, and remove keys in a Kubernetes Deployment configuration using both JSON 6902 patches and strategic merge patches. Each example starts with a Deployment that contains a label with the key “component” set to “api”. The goal is to modify or update these labels as needed in each scenario.
• Updating a Key in a Dictionary
• Using a JSON 6902 Patch
• Consider the following Deployment configuration:
• apps/v1
• “component: api”
• “component: web”
• kustomization.yaml
• |
• • op: replace
• path: /spec/template/metadata/labels/component
• value: web
• /spec/template/metadata/labels/component
• The JSON 6902 patch method provides precise control when updating complex configurations. Choose the patch type that best fits your needs.
• Using a Strategic Merge Patch
• Kustomize will merge this patch with the original Deployment configuration, resulting in an updated “component” label.
• Adding a New Key to a Dictionary
• “org”
• “KodeKloud”
• • op: add
• path: /spec/template/metadata/labels/org
• value: KodeKloud
• “org: KodeKloud”
• When adding new keys, always verify that the target dictionary exists to avoid runtime errors.