Kustomize makes it easy to configure your complex deployments in Kubernetes.
Kustomize lets you manage resource configurations for Kubernetes using YAML files with easy-to-use syntax. It also enables you to manage complex configurations for multi-environment applications by applying serial configurations.
In fact, Kustomize applies patches and overlays to a basic configuration. This simplifies managing complex configurations more than Helm, where you must always redefine a value file. And all this while keeping your code as DRY as possible!
Moreover, Kustomize automatically generates new Kubernetes secrets whenever you modify a data field in the configuration file. This feature keeps secrets secure while simplifying your rollbacks.
However, Kustomize is more challenging to grasp for people unfamiliar with Kubernetes resources and their declaration in YAML. It's also less flexible than Helm in terms of customization: it's impossible to integrate logic via templating, for example.
We believe that Kustomize and Helm are two complementary tools for managing deployment configurations for Kubernetes. While Kustomize is ideal for managing configurations modularly, Helm offers a convenient way of managing more complex application packages.
By using Kustomize with Helm, teams can benefit from the advantages of both tools. For example, Helm can be used to manage complete application packages, while Kustomize can be used to customize specific configurations for deployment environments.
Kustomize is a powerful tool for managing deployment configurations for Kubernetes, with a simple syntax that perfectly complements Helm.