mmatur/kustomize-controller

Kustomize-controller is a tool that automates delivering infrastructure and application workloads to Kubernetes clusters. It is a component of Flux, a broader system for managing Kubernetes through a "GitOps" approach. In practice, this means you describe what your cluster should look like in a Git repository, and the tool continuously works to make the cluster match that description. The tool watches for configuration objects called Kustomization resources within the cluster. When you create, change, or remove one of these resources, the controller springs into action. It fetches configuration files produced by a companion tool called source-controller, assembles them using a system called Kustomize, and applies them to the cluster. If someone manually changes something in the cluster that differs from your intended state, the controller detects that drift and patches it back to match your configuration. This project is designed for platform engineering or DevOps teams managing Kubernetes at scale. For example, if a team manages dozens of microservices and needs to ensure configuration changes are safely rolled out across multiple environments, this controller automates that process. It handles the sequencing of deployments, checks the health of applications after they are deployed, and sends notifications whenever a deployment's status changes. A notable aspect of how this tool operates is its focus on reconciliation and security. It validates configuration changes using dry-runs before applying them, and it can automatically remove resources that are no longer defined in your source files. It also integrates with Mozilla SOPS and key management services to handle encrypted secrets, allowing teams to safely store sensitive information in their Git repositories alongside their other configuration files.