operator-sdk

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Published: Apr 15, 2020 License: Apache-2.0

README

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Overview

This project is a component of the Operator Framework, an open source toolkit to manage Kubernetes native applications, called Operators, in an effective, automated, and scalable way. Read more in the introduction blog post.

Operators make it easy to manage complex stateful applications on top of Kubernetes. However writing an operator today can be difficult because of challenges such as using low level APIs, writing boilerplate, and a lack of modularity which leads to duplication.

The Operator SDK is a framework that uses the controller-runtime library to make writing operators easier by providing:

  • High level APIs and abstractions to write the operational logic more intuitively
  • Tools for scaffolding and code generation to bootstrap a new project fast
  • Extensions to cover common operator use cases

Workflow

The SDK provides workflows to develop operators in Go, Ansible, or Helm.

The following workflow is for a new Go operator:

  1. Create a new operator project using the SDK Command Line Interface(CLI)
  2. Define new resource APIs by adding Custom Resource Definitions(CRD)
  3. Define Controllers to watch and reconcile resources
  4. Write the reconciling logic for your Controller using the SDK and controller-runtime APIs
  5. Use the SDK CLI to build and generate the operator deployment manifests

The following workflow is for a new Ansible operator:

  1. Create a new operator project using the SDK Command Line Interface(CLI)
  2. Write the reconciling logic for your object using ansible playbooks and roles
  3. Use the SDK CLI to build and generate the operator deployment manifests
  4. Optionally add additional CRD's using the SDK CLI and repeat steps 2 and 3

The following workflow is for a new Helm operator:

  1. Create a new operator project using the SDK Command Line Interface(CLI)
  2. Create a new (or add your existing) Helm chart for use by the operator's reconciling logic
  3. Use the SDK CLI to build and generate the operator deployment manifests
  4. Optionally add additional CRD's using the SDK CLI and repeat steps 2 and 3

Prerequisites

  • git
  • go version v1.13+.
  • mercurial version 3.9+
  • docker version 17.03+.
  • kubectl version v1.12.0+.
  • Access to a Kubernetes v1.12.0+ cluster.
  • Optional: delve version 1.2.0+ (for run --local --enable-delve).

Quick Start

Install the Operator SDK CLI

Follow the steps in the installation guide to learn how to install the Operator SDK CLI tool.

Note: If you are using a release version of the SDK, make sure to follow the documentation for that version. e.g.: For version 0.8.1, see docs in https://github.com/operator-framework/operator-sdk/tree/v0.8.1.

Create and deploy an app-operator

# Create an app-operator project that defines the App CR.
$ mkdir -p $HOME/projects/example-inc/
# Create a new app-operator project
$ cd $HOME/projects/example-inc/
$ operator-sdk new app-operator --repo github.com/example-inc/app-operator
$ cd app-operator

# Add a new API for the custom resource AppService
$ operator-sdk add api --api-version=app.example.com/v1alpha1 --kind=AppService

# Add a new controller that watches for AppService
$ operator-sdk add controller --api-version=app.example.com/v1alpha1 --kind=AppService

# Set the username variable
$ export USERNAME=<username>

# Build and push the app-operator image to a public registry such as quay.io
$ operator-sdk build quay.io/$USERNAME/app-operator

# Login to public registry such as quay.io
$ docker login quay.io

# Push image
$ docker push quay.io/$USERNAME/app-operator

# Update the operator manifest to use the built image name (if you are performing these steps on OSX, see note below)
$ sed -i "s|REPLACE_IMAGE|quay.io/$USERNAME/app-operator|g" deploy/operator.yaml
# On OSX use:
$ sed -i "" "s|REPLACE_IMAGE|quay.io/$USERNAME/app-operator|g" deploy/operator.yaml

# Setup Service Account
$ kubectl create -f deploy/service_account.yaml
# Setup RBAC
$ kubectl create -f deploy/role.yaml
$ kubectl create -f deploy/role_binding.yaml
# Setup the CRD
$ kubectl create -f deploy/crds/app.example.com_appservices_crd.yaml
# Deploy the app-operator
$ kubectl create -f deploy/operator.yaml

# Create an AppService CR
# The default controller will watch for AppService objects and create a pod for each CR
$ kubectl create -f deploy/crds/app.example.com_v1alpha1_appservice_cr.yaml

# Verify that a pod is created
$ kubectl get pod -l app=example-appservice
NAME                     READY     STATUS    RESTARTS   AGE
example-appservice-pod   1/1       Running   0          1m

# Test the new Resource Type
$ kubectl describe appservice example-appservice
Name:         example-appservice
Namespace:    myproject
Labels:       <none>
Annotations:  <none>
API Version:  app.example.com/v1alpha1
Kind:         AppService
Metadata:
  Cluster Name:        
  Creation Timestamp:  2018-12-17T21:18:43Z
  Generation:          1
  Resource Version:    248412
  Self Link:           /apis/app.example.com/v1alpha1/namespaces/myproject/appservices/example-appservice
  UID:                 554f301f-0241-11e9-b551-080027c7d133
Spec:
  Size:  3

# Cleanup
$ kubectl delete -f deploy/crds/app.example.com_v1alpha1_appservice_cr.yaml
$ kubectl delete -f deploy/operator.yaml
$ kubectl delete -f deploy/role.yaml
$ kubectl delete -f deploy/role_binding.yaml
$ kubectl delete -f deploy/service_account.yaml
$ kubectl delete -f deploy/crds/app.example.com_appservices_crd.yaml

Note: Follow the steps in the Getting Started Repository to learn how to develop your Operator projects.

Command Line Interface

To learn more about the SDK CLI, see the SDK CLI Reference, or run operator-sdk [command] -h.

User Guides

To learn more about the writing an operator in Go, see the user guide.

The SDK also supports developing an operator using Ansible or Helm. See the Ansible and Helm operator user guides.

Operator capability level

Note that each operator type has a different set of capabilities. When choosing what type to use for your project, it is important to understand the features and limitations of each of the project types and the use cases for your operator.

operator-capability-level

Find more details about the various levels and the feature requirements for them in the capability level documentation.

Samples

To explore any operator samples built using the operator-sdk, see the operator-sdk-samples.

FAQ

For common Operator SDK related questions, see the FAQ.

Contributing

See CONTRIBUTING for details on submitting patches and the contribution workflow.

See the proposal docs and issues for ongoing or planned work.

Reporting bugs

See reporting bugs for details about reporting any issues.

License

Operator SDK is under Apache 2.0 license. See the LICENSE file for details.

Directories

Path Synopsis
cmd
hack
images
internal
generate/gen
Code adapted from: https://github.com/kubernetes-sigs/controller-tools/blob/6eef398/cmd/controller-gen/main.go
Code adapted from: https://github.com/kubernetes-sigs/controller-tools/blob/6eef398/cmd/controller-gen/main.go
olm
Package olm provides an API to install, uninstall, and check the status of an Operator Lifecycle Manager installation.
Package olm provides an API to install, uninstall, and check the status of an Operator Lifecycle Manager installation.
olm/client
Package olm provides an API to install, uninstall, and check the status of an Operator Lifecycle Manager installation.
Package olm provides an API to install, uninstall, and check the status of an Operator Lifecycle Manager installation.
pkg
ansible/watches
Package watches provides the structures and functions for mapping a GroupVersionKind to an Ansible playbook or role.
Package watches provides the structures and functions for mapping a GroupVersionKind to an Ansible playbook or role.
apis/scorecard/v1alpha2
Package v1alpha2 contains API Schema definitions for the cache v1alpha2 API group +k8s:deepcopy-gen=package,register +groupName=osdk.openshift.io
Package v1alpha2 contains API Schema definitions for the cache v1alpha2 API group +k8s:deepcopy-gen=package,register +groupName=osdk.openshift.io
helm/client
Package client provides helper functions for API clients used by the helm operator.
Package client provides helper functions for API clients used by the helm operator.
helm/controller
Package controller provides functions for creating and registering a Helm controller with a `controller-runtime` manager.
Package controller provides functions for creating and registering a Helm controller with a `controller-runtime` manager.
helm/internal/types
Package types contains types used by various components of the Helm operator
Package types contains types used by various components of the Helm operator
helm/release
Package release provides interfaces and default implementations for a Helm release manager, which is used by the Helm controller and reconciler to manage Helm releases in a cluster based on watched custom resources.
Package release provides interfaces and default implementations for a Helm release manager, which is used by the Helm controller and reconciler to manage Helm releases in a cluster based on watched custom resources.
leader
Package leader implements Leader For Life, a simple alternative to lease-based leader election.
Package leader implements Leader For Life, a simple alternative to lease-based leader election.
tls
test

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