Azure Storage backend in Terraform - Step-by-Step Execution

Process Flow - Azure Storage backend

Start Terraform Init

↓

Read backend config

↓

Connect to Azure Storage Account

↓

Access Storage Container

↓

Read/Write Terraform State

↓

Complete Initialization

Terraform initializes by reading backend config, connects to Azure Storage, accesses the container, and manages the state file there.

Execution Sample

Terraform

terraform {
  backend "azurerm" {
    resource_group_name  = "rg-example"
    storage_account_name = "stexample"
    container_name       = "tfstate"
    key                  = "terraform.tfstate"
  }
}

This config tells Terraform to store its state file in an Azure Storage container.

Process Table

Step	Action	Details	Result
1	Start terraform init	Terraform reads backend block	Backend config loaded
2	Connect to Azure Storage	Using resource group 'rg-example' and storage account 'stexample'	Connection successful
3	Access container	Container 'tfstate' checked	Container exists and accessible
4	Read state file	Key 'terraform.tfstate' checked	State file found or created
5	Complete init	Backend ready for state operations	Terraform ready to manage state remotely
6	Exit	Initialization finished	Terraform state backend configured

💡 Initialization stops after backend is configured and state file is ready

Status Tracker

Variable	Start	After Step 2	After Step 3	After Step 4	Final
resource_group_name	undefined	rg-example	rg-example	rg-example	rg-example
storage_account_name	undefined	stexample	stexample	stexample	stexample
container_name	undefined	undefined	tfstate	tfstate	tfstate
key	undefined	undefined	undefined	terraform.tfstate	terraform.tfstate
connection_status	none	connected	connected	connected	connected
state_file_status	none	none	none	found or created	found or created

Key Moments - 3 Insights

Why does Terraform need the storage account and container names?

Terraform uses these to locate where the state file is stored remotely. See execution_table steps 2 and 3 where connection and container access happen.

What happens if the state file does not exist yet?

Terraform creates a new state file in the container. This is shown in execution_table step 4 where the state file is found or created.

Can Terraform work without this backend configuration?

Yes, but then it stores state locally. Using Azure Storage backend enables sharing state safely. This is why initialization connects to Azure Storage as in steps 2-5.

Visual Quiz - 3 Questions

Look at the execution_table, at which step does Terraform confirm the container exists?

A Step 3

B Step 2

C Step 4

D Step 5

💡 Hint

Check the 'Action' and 'Details' columns in execution_table row for step 3.

According to variable_tracker, what is the value of 'key' after step 4?

A undefined

B terraform.tfstate

C tfstate

D stexample

💡 Hint

Look at the 'key' row under 'After Step 4' column in variable_tracker.

If the storage account name was incorrect, which step would fail?

A Step 1

B Step 3

C Step 2

D Step 4

💡 Hint

Step 2 is where Terraform connects to the Azure Storage Account, so failure would occur there.

Concept Snapshot

Terraform Azure Storage backend:
- Configure in terraform block with backend "azurerm"
- Provide resource_group_name, storage_account_name, container_name, and key
- Terraform connects to Azure Storage to store state remotely
- Enables safe state sharing and locking
- Initialization reads and prepares backend before any apply

Full Transcript

This visual execution shows how Terraform initializes an Azure Storage backend. First, Terraform reads the backend configuration specifying resource group, storage account, container, and key for the state file. Then it connects to the Azure Storage account and accesses the specified container. Next, it checks for the state file by the given key, creating it if missing. Finally, initialization completes, making Terraform ready to manage state remotely. Variables like resource_group_name and storage_account_name are set early and remain constant. Key moments include understanding why these Azure details are needed, what happens if the state file is missing, and the benefit of remote state. The quizzes test knowledge of steps where container access happens, variable values after steps, and failure points if config is wrong.