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Getting started with Operator SDK for Ansible-based Operators

The Operator SDK includes options for generating an Operator project that leverages existing Ansible playbooks and modules to deploy Kubernetes resources as a unified application, without having to write any Go code.

To demonstrate the basics of setting up and running an Ansible-based Operator using tools and libraries provided by the Operator SDK, Operator developers can build an example Ansible-based Operator for Memcached, a distributed key-value store, and deploy it to a cluster.

Prerequisites

Creating and deploying Ansible-based Operators

You can build and deploy a simple Ansible-based Operator for Memcached by using the Operator SDK.

Procedure

  1. Create a project.

    1. Create your project directory:

      $ mkdir memcached-operator

    2. Change into the project directory:

      $ cd memcached-operator

    3. Run the operator-sdk init command with the ansible plug-in to initialize the project:

      $ operator-sdk init \
    --plugins=ansible \
    --domain=example.com

  2. Create an API.

    Create a simple Memcached API:

    $ operator-sdk create api \
    --group cache \
    --version v1 \
    --kind Memcached \
    --generate-role (1)
    1 Generates an Ansible role for the API.

  3. Build and push the Operator image.

    Use the default Makefile targets to build and push your Operator. Set IMG with a pull spec for your image that uses a registry you can push to:

    $ make docker-build docker-push IMG=<registry>/<user>/<image_name>:<tag>

  4. Run the Operator.

    1. Install the CRD:

      $ make install

    2. Deploy the project to the cluster. Set IMG to the image that you pushed:

      $ make deploy IMG=<registry>/<user>/<image_name>:<tag>

  5. Create a sample custom resource (CR).

    1. Create a sample CR:

      $ oc apply -f config/samples/cache_v1_memcached.yaml \
    -n memcached-operator-system

    2. Watch for the CR to reconcile the Operator:

      $ oc logs deployment.apps/memcached-operator-controller-manager \
    -c manager \
    -n memcached-operator-system
      Example output
      ...
I0205 17:48:45.881666       7 leaderelection.go:253] successfully acquired lease memcached-operator-system/memcached-operator
{"level":"info","ts":1612547325.8819902,"logger":"controller-runtime.manager.controller.memcached-controller","msg":"Starting EventSource","source":"kind source: cache.example.com/v1, Kind=Memcached"}
{"level":"info","ts":1612547325.98242,"logger":"controller-runtime.manager.controller.memcached-controller","msg":"Starting Controller"}
{"level":"info","ts":1612547325.9824686,"logger":"controller-runtime.manager.controller.memcached-controller","msg":"Starting workers","worker count":4}
{"level":"info","ts":1612547348.8311093,"logger":"runner","msg":"Ansible-runner exited successfully","job":"4037200794235010051","name":"memcached-sample","namespace":"memcached-operator-system"}

  6. Clean up.

    Run the following command to clean up the resources that have been created as part of this procedure:

    $ make undeploy

Next steps