Terraform Notes on getting started with terraform

Terraform Notes

Automating Infrastructure Requirements
  Provisioning Resources
  Planning Updates
  Using Source Control
  Reusing Templates
  
  Build Usind Go Lang
  Install chocolaty and no need to set the path
  
  Terraform Basics
  
  Variable - variable "aws_access_key"
  
  Provider  - provider "aws" { 
                  access_key = "access_key"
               }
   Data Source - data "aws_availability_zones" "available" {}  this tells aws provide the list of AZ's and store it in variable available
               
   Resource - provide info about the resource that we want to create
   
   create a subnet in AZ
   resource "aws_subnet" "subnet1"
   {
   
    cidr_block = "${var.subnet1_address_space}"
    vpc_is = "${aws_vpc.vpc.id}"
    availability_zone = "${data.aws_availability_zones.available.name[0]}"
    
    }
   
   resource "aws_security_group" "elb-sg" {
      name = "nginx_elb_sg"
      vpc_id "${aws_vpc.vpc.id}"
      
      ingress {}
      egress {}
      }
      resource "aws_elb" "web" {
      name = "nginx-elb"
      
        security_groups = ["${aws_security_group.elb-sg.ud}"]
        }
        
   Output - provide out for the aws resource
   
   terraform apply 
   terraform destroy 
   terraform plan
   terraform verion
   
   
   to submit the variable form 
   terraform plan -var-file='..\terraform.tfvars'
   
   to create the infra
   terraform apply -var-file='..\terraform.tfvars'
   
   
    to destroy the infra
   terraform destroy -var-file='..\terraform.tfvars'
   
   
   module.tf will automatically deploy the  infra
   
   Updating infrastructure with more resources
   
   
   Terraform State file - Json file (do not touch)
   
   Terraform is able to 
   Inspect State
   Dependency graph - for example  if a sunet needs to be created in a vpc then first vpc needs to be created
   Addition or Deletions after update
   
   
   
   Configuring Resources After Creation