Infrastructure as CodeAdvanced27 submodules

Terraform Infrastructure as Code

Model, plan, provision, change, import, and govern infrastructure with Terraform providers, resources, expressions, modules, state, backends, and lifecycle controls.

How this module works

From concept to production evidence

Treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

Learning outcomes

Write Terraform configuration
Use variables, locals, data sources, expressions, and outputs
Understand dependency graph and lifecycle
Secure remote state and locking
Design modules, workspaces, imports, iteration, and dynamic configuration

Flow diagram

Terraform Infrastructure as Code end-to-end flow

Use this sequence as the operating backbone for every submodule note and hands-on exercise.

01
Initialize providersTerraform Infrastructure as Code stage 1: initialize providers with an auditable result before the next stage begins.
02
Read configuration and stateTerraform Infrastructure as Code stage 2: read configuration and state with an auditable result before the next stage begins.
03
Build dependency graphTerraform Infrastructure as Code stage 3: build dependency graph with an auditable result before the next stage begins.
04
Plan changeTerraform Infrastructure as Code stage 4: plan change with an auditable result before the next stage begins.
05
Approve and applyTerraform Infrastructure as Code stage 5: approve and apply with an auditable result before the next stage begins.
06
Record state and detect driftTerraform Infrastructure as Code stage 6: record state and detect drift with an auditable result before the next stage begins.

Integrated hands-on lab

Build a modular Azure Terraform stack

Configure providers and remote backend
Create network and compute modules
Use validation, locals, for_each, and outputs
Import an existing resource
Test lifecycle behavior and drift recovery

Complete module contents

27 full submodule notes

Read in order

01

Infrastructure as Code

Infrastructure as Code provides a concrete platform capability that must be configured, secured, validated, observed, and owned throughout its lifecycle within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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02

Providers

Providers defines the major responsibilities, boundaries, and control flow that engineers use before selecting an implementation detail within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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03

Resources

Resources provides a concrete platform capability that must be configured, secured, validated, observed, and owned throughout its lifecycle within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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04

Variables

Variables turns a manual or repeated decision into versioned, parameterized, testable, and observable execution within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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05

Outputs

Outputs provides a concrete platform capability that must be configured, secured, validated, observed, and owned throughout its lifecycle within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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06

Data sources

Data sources preserves durable information with explicit ownership, consistency, access, lifecycle, replication, and recovery guarantees within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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07

Locals

Locals provides a concrete platform capability that must be configured, secured, validated, observed, and owned throughout its lifecycle within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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08

Functions

Functions turns a manual or repeated decision into versioned, parameterized, testable, and observable execution within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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09

Expressions

Expressions turns a manual or repeated decision into versioned, parameterized, testable, and observable execution within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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10

Dependencies

Dependencies provides a concrete platform capability that must be configured, secured, validated, observed, and owned throughout its lifecycle within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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11

Terraform lifecycle

Terraform lifecycle defines the major responsibilities, boundaries, and control flow that engineers use before selecting an implementation detail within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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12

State

State preserves durable information with explicit ownership, consistency, access, lifecycle, replication, and recovery guarantees within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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13

Remote state

Remote state preserves durable information with explicit ownership, consistency, access, lifecycle, replication, and recovery guarantees within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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14

Azure Storage backend

Azure Storage backend preserves durable information with explicit ownership, consistency, access, lifecycle, replication, and recovery guarantees within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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15

State locking

State locking controls which actor may perform which action on which resource, under which conditions, with evidence that can be reviewed later within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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16

Modules

Modules turns a manual or repeated decision into versioned, parameterized, testable, and observable execution within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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17

Workspaces

Workspaces provides a concrete platform capability that must be configured, secured, validated, observed, and owned throughout its lifecycle within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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18

Import

Import governs how a request is named, addressed, routed, filtered, transported, protected, and delivered to a healthy endpoint within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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19

Taint

Taint provides a concrete platform capability that must be configured, secured, validated, observed, and owned throughout its lifecycle within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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20

Lifecycle blocks

Lifecycle blocks controls which actor may perform which action on which resource, under which conditions, with evidence that can be reviewed later within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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21

Dynamic blocks

Dynamic blocks controls which actor may perform which action on which resource, under which conditions, with evidence that can be reviewed later within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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22

for_each

for_each provides a concrete platform capability that must be configured, secured, validated, observed, and owned throughout its lifecycle within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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23

count

count provides a concrete platform capability that must be configured, secured, validated, observed, and owned throughout its lifecycle within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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24

Provisioners

Provisioners provides a concrete platform capability that must be configured, secured, validated, observed, and owned throughout its lifecycle within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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25

Terraform Cloud

Terraform Cloud provides a concrete platform capability that must be configured, secured, validated, observed, and owned throughout its lifecycle within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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26

Terraform security

Terraform security controls which actor may perform which action on which resource, under which conditions, with evidence that can be reviewed later within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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27

Terraform troubleshooting

Terraform troubleshooting restores a safe service state while preserving evidence and reducing the chance that mitigation introduces a second failure within Terraform Infrastructure as Code. It is not an isolated definition: its value appears when it supports treat code and state as production assets: pin providers, use reviewed modules, isolate state by blast radius, lock remote state, inspect every plan, apply with workload identity, and reconcile drift deliberately.

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