• Modules are containers for multiple resources that are used together. A module consists of a collection of .tf and/or .tf.json files kept together in a directory

• A module can call other modules, which lets you include the child module's resources in the configuration concisely.

• Modules can also be called multiple times, either within the same configuration or in separate configurations, allowing resource configurations to be packaged and re-used.

Below is the format on how to use modules:

# Creating a AWS EC2 Instance
resource "aws_instance" "server-instance" {
  # Define number of instance
  instance_count = var.number_of_instances

  # Instance Configuration
  ami                    = var.ami
  instance_type          = var.instance_type
  subnet_id              = var.subnet_id
  vpc_security_group_ids = var.security_group

  # Instance Tagsid
  tags = {
    Name = "${var.instance_name}"
  }
}

# Server Module Variables
variable "number_of_instances" {
  description = "Number of Instances to Create"
  type        = number
  default     = 1
}

variable "instance_name" {
  description = "Instance Name"
}

variable "ami" {
  description = "AMI ID"
  default     = "ami-xxxx"
}

variable "instance_type" {
  description = "Instance Type"
}

variable "subnet_id" {
  description = "Subnet ID"
}

variable "security_group" {
  description = "Security Group"
  type        = list(any)
}

# Server Module Output
output "server_id" {
  description = "Server ID"
  value       = aws_instance.server-instance.id
}

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Different Modules in Terraform:

In Terraform, modules are like building blocks for creating and organizing your infrastructure as code (IAC). Think of them as self-contained units that group related resources and their configurations. Modules are a way to abstract, reuse, and organize your infrastructure code. You can create modules for various purposes, such as defining a web server configuration, a database setup, or a VPC (Virtual Private Cloud) layout. Each module encapsulates a specific set of resources and configurations, making your code more modular, maintainable, and reusable.

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The difference between the root module and the child module:

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Modules vs. Namespaces:

• No, Modules and Namespaces are not the same.

  

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