Welcome to StackSimplify

.gitignore

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+/ADDITIONAL-TOPICS
+FUTURE-TOPICS
+#.gitignore
+
+# macOS Files
+.DS_Store
+
+# Ignore .sh files
+#*.sh
+
+# Terraform Files and Folders
+.terraform
+*.tfstate
+*.tfstate.backup
+#.terraform.lock.hcl
+#*.tfvars
+
+# Ignore .pem files
+#*.pem

01-Infrastructure-as-Code-IaC-Basics/README.md

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+# Infrastructure as Code Basics
+
+## Step-01: Understand Problems with Traditional way of Managing Infrastructure
+- Time it takes for building multiple environments
+- Issues we face with different environments
+- Scale-Up and Scale-Down On-Demand
+
+## Step-02: Discuss how IaC with Terraform Solves them
+- Visibility
+- Stability
+- Scalability
+- Security
+- Audit

02-Terraform-Basics/02-01-Install-Tools-TerraformCLI-AWSCLI-VSCodeIDE/README.md

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+# Terraform & AWS CLI Installation
+
+## Step-01: Introduction
+- Install Terraform CLI
+- Install AWS CLI
+- Install VS Code Editor
+- Install HashiCorp Terraform plugin for VS Code
+
+
+## Step-02: MACOS: Terraform Install
+- [Download Terraform MAC](https://www.terraform.io/downloads.html)
+- [Install CLI](https://learn.hashicorp.com/tutorials/terraform/install-cli)
+- Unzip the package
+```
+# Copy binary zip file to a folder
+mkdir /Users/<YOUR-USER>/Documents/terraform-install
+COPY Package to "terraform-install" folder
+
+# Unzip
+unzip <PACKAGE-NAME>
+unzip terraform_0.14.3_darwin_amd64.zip
+
+# Copy terraform binary to /usr/local/bin
+echo $PATH
+mv terraform /usr/local/bin
+
+# Verify Version
+terraform version
+
+# To Uninstall Terraform (NOT REQUIRED)
+rm -rf /usr/local/bin/terraform
+``` 
+
+## Step-03: MACOS: IDE for Terraform - VS Code Editor
+- [Microsoft Visual Studio Code Editor](https://code.visualstudio.com/download)
+- [Hashicorp Terraform Plugin for VS Code](https://marketplace.visualstudio.com/items?itemName=HashiCorp.terraform)
+
+
+### Step-04: MACOS: Install AWS CLI
+- [AWS CLI Install](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-install.html)
+- [Install AWS CLI - MAC](https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2-mac.html#cliv2-mac-install-cmd)
+
+```
+# Install AWS CLI V2
+curl "https://awscli.amazonaws.com/AWSCLIV2.pkg" -o "AWSCLIV2.pkg"
+sudo installer -pkg AWSCLIV2.pkg -target /
+which aws
+aws --version
+
+# Uninstall AWS CLI V2 (NOT REQUIRED)
+which aws
+ls -l /usr/local/bin/aws
+sudo rm /usr/local/bin/aws
+sudo rm /usr/local/bin/aws_completer
+sudo rm -rf /usr/local/aws-cli
+```
+
+
+## Step-05: MACOS: Configure AWS Credentials 
+- **Pre-requisite:** Should have AWS Account.
+  - [Create an AWS Account](https://portal.aws.amazon.com/billing/signup?nc2=h_ct&src=header_signup&redirect_url=https%3A%2F%2Faws.amazon.com%2Fregistration-confirmation#/start)
+- Generate Security Credentials using AWS Management Console
+  - Go to Services -> IAM -> Users -> "Your-Admin-User" -> Security Credentials -> Create Access Key
+- Configure AWS credentials using SSH Terminal on your local desktop
+```
+# Configure AWS Credentials in command line
+$ aws configure
+AWS Access Key ID [None]: AKIASUF7DEFKSIAWMZ7K
+AWS Secret Access Key [None]: WL9G9Tl8lGm7w9t7B3NEDny1+w3N/K5F3HWtdFH/
+Default region name [None]: us-east-1
+Default output format [None]: json
+
+# Verify if we are able list S3 buckets
+aws s3 ls
+```
+- Verify the AWS Credentials Profile
+```
+cat $HOME/.aws/credentials 
+```
+
+## Step-06: WindowsOS: Terraform & AWS CLI Install
+- [Download Terraform](https://www.terraform.io/downloads.html)
+- [Install CLI](https://learn.hashicorp.com/tutorials/terraform/install-cli)
+- Unzip the package
+- Create new folder `terraform-bins`
+- Copy the `terraform.exe` to a `terraform-bins`
+- Set PATH in windows 
+- Install [AWS CLI](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-install.html)
+
+## Step-07: LinuxOS: Terraform & AWS CLI Install
+- [Download Terraform](https://www.terraform.io/downloads.html)
+- [Linux OS - Terraform Install](https://learn.hashicorp.com/tutorials/terraform/install-cli)

02-Terraform-Basics/02-02-Terraform-Command-Basics/README.md

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+# Terraform Command Basics
+
+## Step-01: Introduction
+- Understand basic Terraform Commands
+  - terraform init
+  - terraform validate
+  - terraform plan
+  - terraform apply
+  - terraform destroy      
+
+## Step-02: Review terraform manifest for EC2 Instance
+- **Pre-Conditions-1:** Ensure you have **default-vpc** in that respective region
+- **Pre-Conditions-2:** Ensure AMI you are provisioning exists in that region if not update AMI ID 
+- **Pre-Conditions-3:** Verify your AWS Credentials in **$HOME/.aws/credentials**
+```t
+# Terraform Settings Block
+terraform {
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      #version = "~> 3.21" # Optional but recommended in production
+    }
+  }
+}
+
+# Provider Block
+provider "aws" {
+  profile = "default" # AWS Credentials Profile configured on your local desktop terminal  $HOME/.aws/credentials
+  region  = "us-east-1"
+}
+
+# Resource Block
+resource "aws_instance" "ec2demo" {
+  ami           = "ami-04d29b6f966df1537" # Amazon Linux in us-east-1, update as per your region
+  instance_type = "t2.micro"
+}
+```
+
+## Step-03: Terraform Core Commands
+```t
+# Initialize Terraform
+terraform init
+
+# Terraform Validate
+terraform validate
+
+# Terraform Plan to Verify what it is going to create / update / destroy
+terraform plan
+
+# Terraform Apply to Create EC2 Instance
+terraform apply 
+```
+
+## Step-04: Verify the EC2 Instance in AWS Management Console
+- Go to AWS Management Console -> Services -> EC2
+- Verify newly created EC2 instance
+
+
+
+## Step-05: Destroy Infrastructure
+```t
+# Destroy EC2 Instance
+terraform destroy
+
+# Delete Terraform files 
+rm -rf .terraform*
+rm -rf terraform.tfstate*
+```
+
+## Step-08: Conclusion
+- Re-iterate what we have learned in this section
+- Learned about Important Terraform Commands
+  - terraform init
+  - terraform validate
+  - terraform plan
+  - terraform apply
+  - terraform destroy     
+
+
+

02-Terraform-Basics/02-02-Terraform-Command-Basics/terraform-manifests/ec2-instance.tf

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+# Terraform Settings Block
+terraform {
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      #version = "~> 3.21" # Optional but recommended in production
+    }
+  }
+}
+
+# Provider Block
+provider "aws" {
+  profile = "default" # AWS Credentials Profile configured on your local desktop terminal  $HOME/.aws/credentials
+  region  = "us-east-1"
+}
+
+# Resource Block
+resource "aws_instance" "ec2demo" {
+  ami           = "ami-0533f2ba8a1995cf9" # Amazon Linux in us-east-1, update as per your region
+  instance_type = "t2.micro"
+}

02-Terraform-Basics/02-03-Terraform-Language-Syntax/README.md

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+# Terraform Configuration Language Syntax
+
+## Step-01: Introduction
+- Understand Terraform Language Basics
+  - Understand Blocks
+  - Understand Arguments, Attributes & Meta-Arguments
+  - Understand Identifiers
+  - Understand Comments
+
+
+
+## Step-02: Terraform Configuration Language Syntax
+- Understand Blocks
+- Understand Arguments
+- Understand Identifiers
+- Understand Comments
+- [Terraform Configuration](https://www.terraform.io/docs/configuration/index.html)
+- [Terraform Configuration Syntax](https://www.terraform.io/docs/configuration/syntax.html)
+```t
+# Template
+<BLOCK TYPE> "<BLOCK LABEL>" "<BLOCK LABEL>"   {
+  # Block body
+  <IDENTIFIER> = <EXPRESSION> # Argument
+}
+
+# AWS Example
+resource "aws_instance" "ec2demo" { # BLOCK
+  ami           = "ami-04d29b6f966df1537" # Argument
+  instance_type = var.instance_type # Argument with value as expression (Variable value replaced from varibales.tf
+}
+```
+
+## Step-03: Understand about Arguments, Attributes and Meta-Arguments.
+- Arguments can be `required` or `optional`
+- Attribues format looks like `resource_type.resource_name.attribute_name`
+- Meta-Arguments change a resource type's behavior (Example: count, for_each)
+- [Additional Reference](https://learn.hashicorp.com/tutorials/terraform/resource?in=terraform/configuration-language) 
+- [Resource: AWS Instance](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/instance)
+- [Resource: AWS Instance Argument Reference](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/instance#argument-reference)
+- [Resource: AWS Instance Attribute Reference](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/instance#attributes-reference)
+- [Resource: Meta-Arguments](https://www.terraform.io/docs/language/meta-arguments/depends_on.html)
+
+## Step-04: Understand about Terraform Top-Level Blocks
+- Discuss about Terraform Top-Level blocks
+  - Terraform Settings Block
+  - Provider Block
+  - Resource Block
+  - Input Variables Block
+  - Output Values Block
+  - Local Values Block
+  - Data Sources Block
+  - Modules Block
+

02-Terraform-Basics/02-03-Terraform-Language-Syntax/terraform-manifests/top-level-blocks-samples.tf

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+#####################################################################
+# Block-1: Terraform Settings Block
+terraform {
+  required_version = "~> 0.14"
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 3.0"
+    }
+  }
+  # Adding Backend as S3 for Remote State Storage with State Locking
+  backend "s3" {
+    bucket = "terraform-stacksimplify"
+    key    = "dev2/terraform.tfstate"
+    region = "us-east-1"  
+
+    # For State Locking
+    dynamodb_table = "terraform-dev-state-table"
+  }
+}
+#####################################################################
+# Block-2: Provider Block
+provider "aws" {
+  profile = "default" # AWS Credentials Profile configured on your local desktop terminal  $HOME/.aws/credentials
+  region  = "us-east-1"
+}
+#####################################################################
+# Block-3: Resource Block
+resource "aws_instance" "ec2demo" {
+  ami           = "ami-04d29b6f966df1537" # Amazon Linux
+  instance_type = var.instance_type
+}
+#####################################################################
+# Block-4: Input Variables Block
+variable "instance_type" {
+  default = "t2.micro"
+  description = "EC2 Instance Type"
+  type = string
+}
+#####################################################################
+# Block-5: Output Values Block
+output "ec2_instance_publicip" {
+  description = "EC2 Instance Public IP"
+  value = aws_instance.my-ec2-vm.public_ip
+}
+#####################################################################
+# Block-6: Local Values Block
+# Create S3 Bucket - with Input Variables & Local Values
+locals {
+  bucket-name-prefix = "${var.app_name}-${var.environment_name}"
+}
+#####################################################################
+# Block-7: Data sources Block
+# Get latest AMI ID for Amazon Linux2 OS
+data "aws_ami" "amzlinux" {
+  most_recent      = true
+  owners           = ["amazon"]
+
+  filter {
+    name   = "name"
+    values = ["amzn2-ami-hvm-*"]
+  }
+
+  filter {
+    name   = "root-device-type"
+    values = ["ebs"]
+  }
+
+  filter {
+    name   = "virtualization-type"
+    values = ["hvm"]
+  }
+
+  filter {
+    name   = "architecture"
+    values = ["x86_64"]
+  }
+
+}
+#####################################################################
+# Block-8: Modules Block
+# AWS EC2 Instance Module
+
+module "ec2_cluster" {
+  source                 = "terraform-aws-modules/ec2-instance/aws"
+  version                = "~> 2.0"
+
+  name                   = "my-modules-demo"
+  instance_count         = 2
+
+  ami                    = data.aws_ami.amzlinux.id
+  instance_type          = "t2.micro"
+  key_name               = "terraform-key"
+  monitoring             = true
+  vpc_security_group_ids = ["sg-08b25c5a5bf489ffa"]  # Get Default VPC Security Group ID and replace
+  subnet_id              = "subnet-4ee95470" # Get one public subnet id from default vpc and replace
+  user_data               = file("apache-install.sh")
+
+  tags = {
+    Terraform   = "true"
+    Environment = "dev"
+  }
+}
+#####################################################################