pulumi-community #general

creamy-potato-29402

09/02/2018, 10:02 PM

Hope that was clear

big-piano-35669

09/02/2018, 10:35 PM

For some things, apply will work. I hope this is sufficient for what you want to do, Ed. We also do plan to support event hooks for pre/post operations, like preUpdate, postDelete, etc. This is tracked by https://github.com/pulumi/pulumi/issues/1691 Eager to hear whether you're successful with just apply here or if you need something richer. We might be able to get something working with dynamic providers if you do (https://github.com/pulumi/pulumi/blob/master/sdk/nodejs/dynamic/index.ts).

boundless-monkey-50243

09/03/2018, 5:05 PM

I can't...find...

apply

boundless-monkey-50243

09/03/2018, 5:06 PM

Like, maybe I'm totally missing it, but I cannot find

apply

aws.ec2.Instance

boundless-monkey-50243

09/03/2018, 5:06 PM

And tbh even if I use that won't it then do its thing during a preview? That seems bad

boundless-monkey-50243

09/03/2018, 5:07 PM

#1691 seems pretty important to actually using this in anger

big-piano-35669

09/03/2018, 5:09 PM

I think Alex probably meant hanging this off its

id

field, e.g.

Copy code

let vm = new aws.ec2.Instance(...);
vm.id.apply(_ => {
    // side-effectful code here
});

The apply body actually does not run during previews, because the value of the ID isn't yet known. This is definitely a bit of an abuse of

apply

, for sure, since it's meant to produce dataflow values that capture dependencies. And it will run on subsequent updates, not just the initial create, which for a lot of VM config scenarios won't work right. It can work for limited scenarios, though. Agree 100%, #1691 is going to be important for anything more sophisticated than "do this once during update."

boundless-monkey-50243

09/03/2018, 5:10 PM

Ah, okay, I see. That's clever

boundless-monkey-50243

09/03/2018, 5:11 PM

A lot of this right now is a bit "bootstrap the world" so I'm trying to figure out the best way to organize the steps involved; something like that would help quite a bit

boundless-monkey-50243

09/03/2018, 5:12 PM

Might have to break this into multiple programs, which is a bummer but expected

boundless-monkey-50243

09/03/2018, 5:12 PM

(even with pre/post events)

boundless-monkey-50243

09/03/2018, 5:13 PM

The way my own local maximum, https://github.com/eropple/auster, works is that it runs a set of CloudFormation templates, in order, with the expectation that pre/post steps occur around those templates; I was hoping that, with something a little more programmatic, I could more reasonably wire it into a single program, but that might be unwise

big-piano-35669

09/03/2018, 5:13 PM

You might be interested to check out the Ruby on Rails example, if you haven't seen it. This is just a sample so not everything works, but it demonstrates using a subset of the CloudInit-style VM initialization that CloudFormation supports: https://github.com/pulumi/examples/blob/master/aws-ts-ruby-on-rails/index.ts This still doesn't support the synchronization with completion, however, a la

cfn-init

and signals.

boundless-monkey-50243

09/03/2018, 5:14 PM

Yeah, I have hacked something similar together with Terraform in the past

boundless-monkey-50243

09/03/2018, 5:14 PM

Not having the CFN metadata service really makes life harder, but it's unavoidable

rough-oil-1458

09/03/2018, 5:16 PM

Couldn't you just create a Component to most of this?

rough-oil-1458

09/03/2018, 5:16 PM

to do *

boundless-monkey-50243

09/03/2018, 5:16 PM

At the cost of significantly increased complexity, sure.

rough-oil-1458

09/03/2018, 5:17 PM

okie dokie 🙂

boundless-monkey-50243

09/03/2018, 5:18 PM

I need to keep things at least mostly comprehensible to my dev team once this rolls out. Minimal custom magic is good.

rough-oil-1458

09/03/2018, 5:19 PM

I hear yea, Don't take my Okie Dokie in a bad way

boundless-monkey-50243

09/03/2018, 5:19 PM

👍

rough-oil-1458

09/03/2018, 5:19 PM

Not everyones situation is the same

boundless-monkey-50243

09/03/2018, 5:19 PM

I did not know about

pcloudinit

though and now I owe Joe a beer

🍻 1

big-piano-35669

09/03/2018, 5:19 PM

It is woefully incomplete.

boundless-monkey-50243

09/03/2018, 5:19 PM

Might be a little mislabeled though

boundless-monkey-50243

09/03/2018, 5:20 PM

It's more cfninit than cloudinit, yeah?

big-piano-35669

09/03/2018, 5:20 PM

Yeah, it sort of morphed in situ. I should probably rename it.

big-piano-35669

09/03/2018, 5:20 PM

I always envisioned that we'd improve it as we encountered more examples and then eventually promote to an "official" Pulumi library.

boundless-monkey-50243

09/03/2018, 5:20 PM

Been there. My auster tools started life as cloud-init and I ended up having to then bolt in cfn-init to get cfn-metadata access