DevOps Classroomnotes 31/Mar/2023

Terraform Contd…

Terraform Modules

  • Terraform modules are reusable terraform templates
  • There are lot of community modules on terraform registry
  • Module demo Refer Here for module usage with aws
  • To create ec2 Refer Here

Terraform provisioners

  • Provisioners are for performing activities in local or remote instance after resource creation

Terraform interview questions

  • What is terraform
  • What is infrastructure as Code
  • Can Ansible replace Terraform
  • What is resource, argument and attribute
  • What is terraform lifecycle:
    • here we have three stages
      • create
      • modify
      • delete
    • actions:
      • op
      • no-op
  • What is terraform registry: this is collection of modules
  • How to use two providers
    • use alias
provider "aws" {
region = "us-west-2"
alias = red

provider "aws" {
region = "us-west-2"
alias = green

resource "aws_vpc" "red_vpc" {
provider =

resource "aws_vpc" "green_vpc" {
provider =

  • How to use terraform in ci/cd pipeline
    • on jenkins node install terraform
    • sh terraform apply -auto-approve
    • azure devops:
      • bash terraform apply -auto-approve
      • Terraform market place
  • What is the purpose of backend
  • What is the purpose of workspace
  • Write one terraform template to do resource creation
  • How to do zero down time deployments in terraform

    • Create tags and apply terraform only of specific tags
    • Use count with conditions
  • How to delete the resource which is managed by terraform
terraform state rm <resource-path>
  • How to delete and recreate the resource during next apply
terraform taint <resource-path>

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