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KNI Operator

This is currently a Proof of Concept.

The goal of this operator is to:

  • Ensure a particular CatalogSource is available
  • Ensure Subscriptions exist to one or more operators in that CatalogSource
  • Ensure a CR exists for each operator so that it deploys its operand
  • Watch the ClusterVersion and change the CatalogSource to reference an image that corresponds to the current ClusterVersion

The result enables a collection of operators to be released, installed and upgraded together via a CatalogSource at carefully-chosen and tested versions. A new CatalogSource gets created for each ClusterVersion, so that the operators can be tested on specific releases of OpenShift.

Try It

In this demo will you will:

  • Deploy the operator
  • See it deploy the etcd-operator from the associated CatalogSource
  • Increment the ClusterVersion
  • See the CatalogSource get changed based on the ClusterVersion, and then see the etcd-operator get upgraded.

This demo utilizes a simple catalog source image. It has two branches: 1.0 and 1.1. The latter adds version 0.9.4 of the etcd operator.

All of the manifests in the catalog source image were copied straight from operatorhub.io.

Setup

Start minikube.

minikube start --kubernetes-version v1.13.6

Install the Operator Lifecycle Manager. This command was copied straight from operatorhub.io. If you see errors, just run it a second time.

kubectl apply -f https://raw.githubusercontent.com/operator-framework/operator-lifecycle-manager/master/deploy/upstream/quickstart/crds.yaml
kubectl create -f https://raw.githubusercontent.com/operator-framework/operator-lifecycle-manager/master/deploy/upstream/quickstart/olm.yaml

Create required CRDs and a ClusterVersion.

kubectl create -f deploy/crds/kni_v1alpha1_knicluster_crd.yaml
kubectl create --validate=false -f demo/0000_00_cluster-version-operator_01_clusterversion.crd.yaml
kubectl create -f demo/clusterversion.yaml

Start the kni-operator.

operator-sdk up local

Delete the Operator Hub CatalogSource just to keep it out of the way and keep things simple.

kubectl delete catalogsource operatorhubio-catalog -n olm

Create KNICluster

Create a namespace to work with (it is currently hard-coded, so use this value).

kubectl create ns kniops

Create the KNICluster resource

kubectl create -f deploy/crds/kni_v1alpha1_knicluster_cr.yaml

Results

You should see a CatalogSource and a Subscription.

$ kubectl get catalogsources -n olm
NAME            NAME            TYPE       PUBLISHER           AGE
demo-catalog    KNI Operators   grpc       kni.openshift.com   32s
olm-operators   OLM Operators   internal   Red Hat             6m
$ kubectl get subscriptions -n kniops
NAME   PACKAGE   SOURCE         CHANNEL
kni    etcd      demo-catalog   singlenamespace-alpha

You may need to wait a while for OLM to notice the CatalogSource, notice the Subscription, and act on them. Eventually you will see an etcd ClusterServiceVersion:

$ kubectl get csvs --all-namespaces
NAMESPACE   NAME                    DISPLAY          VERSION   REPLACES              PHASE
kniops      etcdoperator.v0.9.2     etcd             0.9.2     etcdoperator.v0.9.0   Succeeded
olm         packageserver.v0.10.0   Package Server   0.10.0

You will also see a package manifest

$ kubectl get packagemanifests
NAME            CATALOG            AGE
packageserver   OLM Operators      9h
etcd            KNI Operators      9h

Finally you will see that the etcd operator was deployed.

$ kubectl get pods -n kniops

Once you see the etcd operator deployed, you can move on to the Upgrade section.

Upgrade

Edit the ClusterVersion and change the version from "1.0" to "1.1".

$ kubectl edit clusterversion kni

You will then need to wait for OLM to see the change, but eventually the etcd operator will be upgraded. You can look at the Subscription to see the update.

$ kubectl get subscription kni -n kniops -o yaml
apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  creationTimestamp: "2019-05-30T05:24:45Z"
  generation: 1
  name: kni
  namespace: kniops
  ownerReferences:
  - apiVersion: kni.openshift.com/v1alpha1
    blockOwnerDeletion: true
    controller: true
    kind: KNICluster
    name: example-knicluster
    uid: 112b21f3-829b-11e9-aaed-583824d484b7
  resourceVersion: "66999"
  selfLink: /apis/operators.coreos.com/v1alpha1/namespaces/kniops/subscriptions/kni
  uid: 3c51385d-829b-11e9-aaed-583824d484b7
spec:
  channel: singlenamespace-alpha
  name: etcd
  source: demo-catalog
  sourceNamespace: olm
status:
  currentCSV: etcdoperator.v0.9.4
  installPlanRef:
    apiVersion: operators.coreos.com/v1alpha1
    kind: InstallPlan
    name: install-wbtqn
    namespace: kniops
    resourceVersion: "66990"
    uid: f8280c17-82d4-11e9-aaed-583824d484b7
  installedCSV: etcdoperator.v0.9.4
  installplan:
    apiVersion: operators.coreos.com/v1alpha1
    kind: InstallPlan
    name: install-wbtqn
    uuid: f8280c17-82d4-11e9-aaed-583824d484b7
  lastUpdated: "2019-05-30T12:18:04Z"
  state: AtLatestKnown