Why do we need it?

• To manage and customize configuration files, enabling more flexible and maintainable deployments.

What is it?

• Kustomize is configuration management solution for customizing your applications in Kubernetes, where you can keep the original settings as a base and then apply changes using special configuration files, called patches, without actually altering the original files. This allows you to tweak your applications without messing up their core configuration.

Prerequisites:

0. Kubernetes Cluster

   • minikube start --nodes=2 --kubernetes-version v1.25.14 can be used to create a simple cluster in your local machine

1. kubectl version

If you have 1.21 or above of kubectl you will have access to kubectl kustomize which is the recommended method. If you aren't on version 1.21 or above, upgrade kubectl. (4*)

2. Create namespaces

kubectl create namespace dev

kubectl create namespace prod

Test

kustomize build overlays/dev

kustomize build overlays/prod

kubectl apply -k overlays/dev

kubectl apply -k overlays/prod

Resources

1. https://kubectl.docs.kubernetes.io/guides/introduction/kustomize/

2. https://devopscube.com/kustomize-tutorial/

3. Kustomize: The Best Way to Manage Your Kubernetes Configs

4. https://github.com/devopsjourney1/mykustomapp/blob/master/README.md