Here is an example of creating a managed Kubernetes cluster on DigitalOcean.

import * as pulumi from "@pulumi/pulumi";
import * as digitalocean from "@pulumi/digitalocean";

const foo = new digitalocean.KubernetesCluster("foo", {
    region: "nyc1",
    version: "1.20.2-do.0",
    nodePool: {
        name: "front-end-pool",
        size: "s-2vcpu-2gb",
        nodeCount: 3,
    },
});

Example code taken from the Pulumi DigitalOcean package documentation. How do I retrieve the droplet node IPv4 addresses for use in say creating 

DnsRecord

 resources?

const _default = new digitalocean.Domain("default", {name: "<http://example.com|example.com>"});

// This code doesn't work because foo.nodePool is just the inputs.
const dnsRecords = foo.nodePool.nodes(node => new digitalocean.DnsRecord("www", {
    domain: _default.name,
    type: "A",
    value: node.ipv4Address,
}));

I assume I have to either use the async methods such as https://www.pulumi.com/registry/packages/digitalocean/api-docs/getkubernetescluster/

function getKubernetesCluster(args: GetKubernetesClusterArgs, opts?: InvokeOptions): Promise<GetKubernetesClusterResult>

But the problem then is I can't pass the cluster ID to this method as the resource has not bee provisioned yet when this method is called. I also thought of generating a resource using the static

get

method defined on the resource but I also don't think I have the ID of the cluster to call this method yet. https://www.pulumi.com/registry/packages/digitalocean/api-docs/kubernetescluster/#look-up

public static get(name: string, id: Input<ID>, state?: KubernetesClusterState, opts?: CustomResourceOptions): KubernetesCluster

hmm, are you sure that nodePool doesn’t have any outputs?

@freezing-umbrella-80278 I responded to your StackOverflow post: https://stackoverflow.com/a/70610508/645002

@billowy-army-68599 much appreciated will give it a go in a bit.

Damn, you were faster @billowy-army-68599 😛 Was about to write something quite similar.

@prehistoric-activity-61023 that's a good question it would appear provided the droplet isn't destroyed it is indeed static. https://www.digitalocean.com/community/questions/will-my-droplet-have-a-static-ip You're right I should be using a load balancer, but I'm trying to build an ultra-cheapo cluster I can use to just play around with. I suppose if I ever needed to migrate I would just build a new cluster with a load balancer and add that to the DNS entries, then remove the DNS for the old cluster and wait for the traffic to fully drain before destroying it.

@freezing-umbrella-80278 I can imagine. I have k8s cluster on DO for pretty the same reason (I’d like to use GCP but it’s too expensive for my private, non-commercial project). Still, simple LB is pretty cheap on DO ($10/month) so you might save yourself some trouble and try to go that way.

@prehistoric-activity-61023 I was doing a 2 node, 1 LB cluster before on DO which was $30 a month

I see. Right now I’ve got 3xs-1vcpu-2gb + LB + container registry and it costs about ~$45

Yeah that's too rich for my blood, I'll wait until I have something worth spending that kind of cheddar on. 😄

I wouldn’t call it a 2 node cluster 😉 Most of the cloud offerings include control plane separately (even o GCP you can get one zonal control plane for free).

Fair enough, if feels like it's free because I still remember using Typhoon to deploy a k8s cluster to DO before they had their managed product. 😄 https://typhoon.psdn.io/architecture/digitalocean/

…and I used to think I know a lot about k8s.. I’ve never heard of Typhoon project.

Yeah it wasn't much fun to maintain, much happier now DO provides managed k8s

doesn't digitalocean.getDropletOutput return a promise and therefore need to be awaited?

Only if you're doing some string manipulation, if you're passing the result to another resource, Pulumi will figure it out for you

@billowy-army-68599 sounds like black magic. So does Pulumi register under the hood that

n

is actually a pending promise and you're attempting to access

n.ipv4Address

when constructing the

DnsRecord

. So the graph is created and then Pulumi will ensure the previous dependency and it's outputs are available before resolving the

DnsRecord

?

it does it inside the engine, but yes that's right.

apply()

is like saying "wait for this thing to resolve"

getSomethingOutput

is similar

That's awesome, thank you both for your help.

@freezing-umbrella-80278 if my SO answer helped, would be great to accept the answer