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Atlas · Foundations infrastructure-stacks

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Infrastructure Stacks

A CloudFormation stack groups managed cloud resources; a template describes the plan, while an operation’s observed result tells you what was created.

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    Beginner field notes

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    • In this lesson, a stack is a CloudFormation-managed group of related AWS resources, such as a bucket and a queue.
    • A template describes the desired resources and settings. The written definition is separate from the stack instance created through an operation.
    • Editing a local template does not by itself change deployed resources. Inspect the submitted operation and its result to know what exists.
    See a worked example

    Separate the plan from the observed stack inventory

    Sample only. Nothing here runs on your computer.

    Example input · do not paste
    OFFLINE inventory exercise; not deployable CloudFormation syntax or commands.
Template ArchivePlan-v1 describes CatalogStore (storage bucket) and IntakeQueue (queue).
Initially: no ArchivePreview stack; no resources from this example exist.
Step 1: write ArchivePlan-v1 locally. No stack operation is submitted.
Step 2: assume a separate authorized create operation using v1 completes successfully. Its supplied inventory maps CatalogStore to paper-store-P and IntakeQueue to paper-queue-P.
Step 3: edit the local plan to v2, adding Worker. No update operation is submitted.
Assume no other resource changes. Which definition and resources exist after each step?
    Example output · do not paste
    After step 1: local definition v1; no ArchivePreview stack or created resources.
After step 2: ArchivePreview is the stated created stack, with CatalogStore=paper-store-P and IntakeQueue=paper-queue-P.
After step 3: local definition v2 mentions Worker, but the stated deployed inventory still has only those two resources. No created Worker is established.

    Classify each row as definition, operation or observed inventory. Only the separately assumed successful operation changes this inventory. An edited plan is not a deploy event; the fictional resource identifiers are neither credentials nor observations from a cloud account.

    Visual

    A written plan is separate from an assumed successful create operation and the resulting stack with two resources. A later local edit with no update operation leaves the stated inventory unchanged. This is an offline teaching diagram.

    The reviewed description and complete diagram source are available here.

    Read the complete diagram source

    This is the source for the reviewed diagram, not a command to run.

    flowchart TD
  T["Template: desired plan"] --> O["Assumed successful create: paper only"]
  O --> S["ArchivePreview: stack instance"]
  S --> A["CatalogStore: observed resource"]
  S --> B["IntakeQueue: observed resource"]
  E["Edit local plan"] -.-> N["No update operation: inventory unchanged"]
    Sources and full explanation

    Notes sources · Beginner

    AI source review · 2026-10-17

    Reviewed explanation

    Here, an infrastructure stack means a CloudFormation-managed collection of related AWS resources. A resource is one item, such as a storage bucket or a queue. A directory full of template files is not, by itself, that deployed collection.

    A template is the declarative definition: it describes intended resources and their settings. CloudFormation uses a supplied template when carrying out a stack operation. Merely writing or editing that definition on your computer is not an operation and does not show that resources exist.

    The stack instance and its observed resources are separate from the reusable definition. Another stack operation can use the same template with suitable inputs. It is still a separate operation; identical plan text is not evidence that two stacks share one already-created resource.

    CloudFormation manages stack creation, updates and deletion. These actions need appropriate permissions and can fail. Updates can interrupt or replace underlying resources depending on their properties; a preview of proposed changes is not a guarantee that an update will succeed.

    In the Lantern Archive paper example, a stated successful creation gives ArchivePreview two resources. Editing the local plan to add a worker, without submitting an update, leaves that observed inventory at two. The labels and results are explicit fictional assumptions, not a report about any AWS account.

    • AWS CloudFormation: How CloudFormation works

      Introduces resources, declarative templates and managed stack instances, parameterized reuse and explicit stack operations. Its update/change-set sections qualify resource interruption/replacement and failed operations. The paper inventory and successful-create/no-update facts are authored assumptions, not AWS execution results.

    AI source comparison recorded 2026-10-17. Human learner validation is pending.

    Quick quiz · one question

    Distinguish local plan edits from observed resources

    Sample scenario. Synthetic offline Lantern Archive fixture. One given successful create,no imports/sharing/other operations. The paper inventory is not a CloudFormation execution.

    Definition v1
    CatalogStore, IntakeQueue
    Definition v2
    CatalogStore, IntakeQueue, Worker
    Step 1
    Write only local v1; no stack operation.
    Step 2
    Assume creation of ArchivePreview with v1 completed; supplied inventory CatalogStore=paper-store-P, IntakeQueue=paper-queue-P. Not an executed template.
    Step 3
    Write only local v2; no stack operation.

    The local definition changes from v1 to v2, but no update is submitted. Which resources are in the stated ArchivePreview inventory after the three steps?

    Answers stay on this device.

    Sources and exercise scope
    • AWS CloudFormation: How CloudFormation works

      Introduces resources, declarative templates and managed stack instances, parameterized reuse and explicit stack operations. Its update/change-set sections qualify resource interruption/replacement and failed operations. The paper inventory and successful-create/no-update facts are authored assumptions, not AWS execution results.

    Original synthetic exercise. AI comparison against the reviewed lesson recorded on 2026-10-17; the references above state their scope. Human learner validation has not been run. A result here records this attempt; it does not establish mastery.

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