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Terraform Resource Meta-Argument for_each

Step-01: Introduction

  • Understand about Meta-Argument for_each
  • Implement for_each with Maps
  • Implement for_each with Set of Strings

Step-02: Implement for_each with Maps

  • Reference Folder: v1-for_each-maps
  • Use case: Create four S3 buckets using for_each maps
  • c2-s3bucket.tf 
    # Create S3 Bucket per environment with for_each and maps
resource "aws_s3_bucket" "mys3bucket" {

  for_each = {
    dev   = "my-dapp-bucket"
    qa    = "my-qapp-bucket"
    stag  = "my-sapp-bucket"    
    prod  = "my-papp-bucket"        
  }  

  bucket = "${each.key}-${each.value}"
  acl    = "private"

  tags = {
    eachvalue   = each.value
    Environment = each.key
    bucketname  = "${each.key}-${each.value}"
  }
}

Step-03: Execute Terraform Commands

# Switch to Working Directory
cd v1-for_each-maps

# Initialize Terraform
terraform init

# Validate Terraform Configuration Files
terraform validate

# Format Terraform Configuration Files
terraform fmt

# Generate Terraform Plan
terraform plan
Observation: 
1) Four buckets creation will be generated in plan
2) Review Resource Names ResourceType.ResourceLocalName[each.key]
2) Review bucket name (each.key+each.value)
3) Review bucket tags

# Create Resources
terraform apply
Observation: 
1) 4 S3 buckets should be created
2) Review bucket names and tags in AWS Management console

# Destroy Resources
terraform destroy

# Clean-Up 
rm -rf .terraform*
rm -rf terraform.tfstate*

Step-04: Implement for_each with toset "Strings"

  • Reference Folder: v2-for_each-toset
  • Use case: Create four IAM Users using for_each toset strings
  • c2-iamuser.tf 
    # Create 4 IAM Users
resource "aws_iam_user" "myuser" {
  for_each = toset( ["Jack", "James", "Madhu", "Dave"] )
  name     = each.key
}

Step-05: Execute Terraform Commands

# Switch to Working Directory
cd v2-for_each-toset

# Initialize Terraform
terraform init

# Validate Terraform Configuration Files
terraform validate

# Format Terraform Configuration Files
terraform fmt

# Generate Terraform Plan
terraform plan
Observation: 
1) Four IAM users creation will be generated in plan
2) Review Resource Names ResourceType.ResourceLocalName[each.key]
2) Review IAM User name (each.key)

# Create Resources
terraform apply
Observation: 
1) 4 IAM users should be created
2) Review IAM users in AWS Management console

# Destroy Resources
terraform destroy

# Clean-Up 
rm -rf .terraform*
rm -rf terraform.tfstate*

Reference

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