Project layout - Developing Operators | Operators | Red Hat OpenShift Service on AWS

Go-based project layout

The operator-sdk CLI can generate, or scaffold, a number of packages and files for each Operator project.

The Red Hat-supported version of the Operator SDK CLI tool, including the related scaffolding and testing tools for Operator projects, is deprecated and is planned to be removed in a future release of Red Hat OpenShift Service on AWS. Red Hat will provide bug fixes and support for this feature during the current release lifecycle, but this feature will no longer receive enhancements and will be removed from future Red Hat OpenShift Service on AWS releases.

The Red Hat-supported version of the Operator SDK is not recommended for creating new Operator projects. Operator authors with existing Operator projects can use the version of the Operator SDK CLI tool released with Red Hat OpenShift Service on AWS to maintain their projects and create Operator releases targeting newer versions of Red Hat OpenShift Service on AWS.

The following related base images for Operator projects are not deprecated. The runtime functionality and configuration APIs for these base images are still supported for bug fixes and for addressing CVEs.

The base image for Ansible-based Operator projects
The base image for helm-based Operator projects

For information about the unsupported, community-maintained, version of the Operator SDK, see Operator SDK (Operator Framework).

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Go-based project layout

Go-based Operator projects, the default type, generated using the operator-sdk init command contain the following files and directories:

File or directory Purpose

File or directory	Purpose
`main.go`	Main program of the Operator. This instantiates a new manager that registers all custom resource definitions (CRDs) in the `apis/` directory and starts all controllers in the `controllers/` directory.
`apis/`	Directory tree that defines the APIs of the CRDs. You must edit the `apis/<version>/<kind>_types.go` files to define the API for each resource type and import these packages in your controllers to watch for these resource types.
`controllers/`	Controller implementations. Edit the `controller/<kind>_controller.go` files to define the reconcile logic of the controller for handling a resource type of the specified kind.
`config/`	Kubernetes manifests used to deploy your controller on a cluster, including CRDs, RBAC, and certificates.
`Makefile`	Targets used to build and deploy your controller.
`Dockerfile`	Instructions used by a container engine to build your Operator.
`manifests/`	Kubernetes manifests for registering CRDs, setting up RBAC, and deploying the Operator as a deployment.

main.go

Main program of the Operator. This instantiates a new manager that registers all custom resource definitions (CRDs) in the apis/ directory and starts all controllers in the controllers/ directory.

apis/

Directory tree that defines the APIs of the CRDs. You must edit the apis/<version>/<kind>_types.go files to define the API for each resource type and import these packages in your controllers to watch for these resource types.

controllers/

Controller implementations. Edit the controller/<kind>_controller.go files to define the reconcile logic of the controller for handling a resource type of the specified kind.

config/

Kubernetes manifests used to deploy your controller on a cluster, including CRDs, RBAC, and certificates.

Makefile

Targets used to build and deploy your controller.

Dockerfile

Instructions used by a container engine to build your Operator.

manifests/

Kubernetes manifests for registering CRDs, setting up RBAC, and deploying the Operator as a deployment.

Project layout for Go-based Operators

Go-based project layout