Quickstart for Go-based Operators

This guide walks through an example of building a simple memcached-operator using tools and libraries provided by the Operator SDK.

Prerequisites

• Go through the installation guide.
• User authorized with cluster-admin permissions

Steps

1. Create a project directory for your project and initialize the project:

mkdir memcached-operator
cd memcached-operator
operator-sdk init --domain example.com --repo github.com/example/memcached-operator

1. Create a simple Memcached API:

operator-sdk create api --group cache --version v1alpha1 --kind Memcached --resource --controller

1. Use the built-in Makefile targets to build and push your operator. Make sure to define IMG when you call make:

export USERNAME=<quay-namespace>
export OPERATOR_IMG="quay.io/$USERNAME/memcached-operator:v0.0.1"
make docker-build docker-push IMG=$OPERATOR_IMG

OLM deployment

1. Install OLM:

operator-sdk olm install

1. Bundle your operator and push the bundle image:

make bundle IMG=$OPERATOR_IMG
# Note the "-bundle" component in the image name below.
export BUNDLE_IMG="quay.io/$USERNAME/memcached-operator-bundle:v0.0.1"
make bundle-build BUNDLE_IMG=$BUNDLE_IMG
make docker-push IMG=$BUNDLE_IMG

1. Run your bundle:

operator-sdk run bundle $BUNDLE_IMG

1. Create a sample Memcached custom resource:

$ kubectl apply -f config/samples/cache_v1alpha1_memcached.yaml
memcached.cache.example.com/memcached-sample created

1. Uninstall the operator:

operator-sdk cleanup memcached-operator

Direct deployment

1. Deploy your operator:

make deploy IMG=$OPERATOR_IMG

1. Create a sample Memcached custom resource:

$ kubectl apply -f config/samples/cache_v1alpha1_memcached.yaml
memcached.cache.example.com/memcached-sample created

1. Uninstall the operator:

make undeploy

Next Steps

Read the full tutorial for an in-depth walkthough of building a Go operator.