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What is Kustomize?

Kustomize is a standalone tool to customize Kubernetes objects through a kustomization file.

Since 1.14, Kubectl also supports the management of Kubernetes objects using a kustomization file. For example to view Resources found in a directory containing a kustomization file, run the following command:

kubectl kustomize <kustomization_directory>

To apply those Resources, run kubectl apply with –kustomize or -k flag:

kubectl apply -k <kustomization_directory>