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pulumi should automatically detect dependencies among resources

I will probably share some screenshots but they are based on

pulumi destroy

but it’s not possible to get the behavior based on this screenshot AFAIK

However, I see the following behaviour as well.

I don’t think the order of resources printed by pulumi preview is related to the real order of actions.

Ok, is it a problem with pulumi preview then? But, it will go anyway fine with pulumi updates. Is that what you mean?

yeah, that’s what I’m suggesting

Ok, why do it behave differently from time to time?

you mean the order of resources printed there?

Yes, the order is different and please have a closer look.

if there are “the same” assuming you sort resources alphabetically, I’d say it might be expected

Ok, let me try to destroy the resources to see if they are getting deleted in right order.

To sum up, if: • pulumi performs actions properly (that is, it creates resources with dependsOn after the dependencies are created) • the content (but not the order of elements itself) of pulumi preview looks as expected • the tree structure is rendered as expected (based on

parent

field) there’s nothing wrong here in my opinion :)

Got it! However, I will verify things once how things are getting deleted.

Sure 🙂 If you still have some doubts after that, let me know and we’ll try to figure this out.

Ok, that's great and thanks!

Two additional things: 1) You don’t have to use

dependsOn

explicitly if you use another resource outputs while creating a new one (pulumi will detect that automatically); not sure if that’s applicable to your case, I’d have to check the code once again

WARNING - pseudo code
----

  resource_a = gcp.BucketOrWhatever(...)

  resource_b = gcp.LoadBalancerToBucket(
=>   target=resource_a.name
  )

due to the fact you referenced

resource_a.name

while creating

resource_b

, pulumi knows it must create a

resource_a

first.

DependsOn

is useful if such dependencies are not visible in code. 2) The fact you marked a resource with

dependsOn

does not affect parent-child relationship. If you want to affect the tree structure for visibility, you have to explicitly set

parent

field.

Like @prehistoric-activity-61023 was saying, and to clarify,

pulumi preview

shows you the parent/child relationship - which is purely organizational and has no bearing on the ordering of resource provisioning. The parent/child relationship is one:many, and is used to create logical groups of your resources - such as when you create a

ComponentResource

and assign all resources beneath it as

parent: this,

you are creating a logical group. This is different from the dependency tree, which is many:one and is determined either implicitly by

Outputs

being passed around, or explicitly with the

dependsOn

property - if you would like to see what this tree looks like you can use the

pulumi stack graph

command.

Yes, it is true that tree structure you see from

pulumi preview

doesn't affect the parent-child relationship during

pulumi update

and I verified it as well. Thanks a lot @prehistoric-activity-61023 & @bored-oyster-3147 for providing more information and clarity on this.