Existing Cluster Constructs

[gbvanrenswoude]

Is the blueprints.ClusterAddOn usable on existing cdk eks.Cluster Constructs / ICluster interfaces? It would be awesome to be able to ship ClusterAddOns to existing clusters deployed using aws-cdk. I'm not sure if that is the point of the blueprints, but it would extend very nicely on top of people who code their own Clusters or have them already running.

[shapirov103]

I will add an example of importing an existing cluster and applying add-ons to them.

[gbvanrenswoude]

@shapirov103 Is it also possible to provide an example in the documentation on how to use blueprints in combination with existing eks.Cluster constructs?

e.g.

import { Cluster } from 'aws-cdk-lib/aws-eks';
<...>

export class InfrastructureStack extends Stack {
    private cluster: Cluster;

    constructor(scope: Construct, id: string, uniqueName: string, owner: nnOwner, featureBranchToggle: boolean, props?: StackProps) {
        super(scope, id, props);

        this.cluster = new eks.Cluster(this, 'eks', {...});
        <...use blueprint 'Construct' ClusterAddOn to build on top...>

<....>
        const clusterInfo = new blueprints.ClusterInfo(this.cluster, kubernetesVersion);

        const postDeploymentSteps = Array<blueprints.ClusterPostDeploy>();

        for (const addOn of stackPropsPassedIn.addOns ?? []) {
            // eslint-disable-next-line no-console
            console.log(`Adding AddOn: ${blueprints.utils.getAddOnNameOrId(addOn)}`);
            const result = addOn.deploy(clusterInfo);
            if (result) {
                const addOnKey = blueprints.utils.getAddOnNameOrId(addOn);
                clusterInfo.addScheduledAddOn(addOnKey, result);
            }
            // eslint-disable-next-line @typescript-eslint/no-explicit-any
            const postDeploy: any = addOn;
            if ((postDeploy as blueprints.ClusterPostDeploy).postDeploy !== undefined) {
                postDeploymentSteps.push(<blueprints.ClusterPostDeploy>postDeploy);
            }
        }
        const scheduledAddOns = clusterInfo.getAllScheduledAddons();
        const addOnKeys = [...scheduledAddOns.keys()];
        const promises = scheduledAddOns.values();

        this.asyncTasks = Promise.all(promises).then((constructs) => {
            constructs.forEach((construct, index) => {
                clusterInfo.addProvisionedAddOn(addOnKeys[index], construct);
            });

            for (const step of postDeploymentSteps) {
                step.postDeploy(clusterInfo, []);
            }
        });

        this.asyncTasks.catch((err) => {
            // eslint-disable-next-line no-console
            console.error(err);
            throw new Error(err);
        });

[shapirov103]

Will add an item to show leveraging existing cluster and add add-ons / teams.

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