In this lesson, you will learn how to bootstrap a production-ready Go-based operator project using the operator-sdk CLI tool.
When building operators, you don't start from a blank repository; instead, you use scaffolding tools to generate a standardized structure that complies with the Kubernetes controller runtime patterns. This ensures your project follows best practices for resource organization, API definitions, and controller reconciliation loops.
Scaffolding Your Project
To initialize a new project, navigate to your workspace and execute the init command. This creates the foundational layout necessary for your operator:
mkdir my-operator
cd my-operator
operator-sdk init --domain example.com --repo github.com/example/my-operator
The --domain flag defines your API group prefix, while --repo sets the Go module path. Once executed, the SDK generates several critical components:
go.mod: Handles your Go module dependencies.cmd/main.go: The entry point that configures the Manager and starts the reconciliation loop.config/: Contains the Kubernetes manifests, including RBAC, CRD bases, and default manager configurations.Makefile: Provides built-in targets to build, install, and run your operator.
Why This Structure Matters
By using operator-sdk init, you ensure that your project is pre-configured to work with the Operator Lifecycle Manager (OLM). The scaffolding provides a config/ directory structured for kustomize, allowing you to easily manage manifest patches for different environments—a concept we previously explored in our Helm and CI/CD modules.
Once initialized, the standard workflow involves adding an API and Controller using operator-sdk create api. This keeps your business logic isolated from the boilerplate code required to interact with the Kubernetes API server, allowing you to focus entirely on the reconciliation logic that manages your Custom Resources.
By adopting this standardized structure, you align your development process with the broader Kubernetes ecosystem, ensuring that your operators remain portable and maintainable as your infrastructure grows.
Key Takeaway: Initializing with operator-sdk init creates a standardized Go project scaffold that provides the essential boilerplate, dependency management, and configuration layouts required to build robust, production-ready Kubernetes operators.