Thursday, July 8, 2021

Ansible Vs Terraform - What is the difference between Ansible and Terraform - Ansible Vs Terraform

This is one of the common DevOps interview questions. What is the difference between Ansible and Terraform? When will you choose Ansible over Terraform?

Factor Ansible Terraform
Type Configuration mgmt
Infrastructure mutable Immutable
Language Procedural Declarative
Written in Python Go
Architecture client only
client only
State Management
Syntax YAML
UI/CLI Has both UI(Ansible Tower) and CLI
only CLI based

Thursday, July 1, 2021

Jenkins Terraform Integration | How do you integrate Terraform with Jenkins | Automate Infrastructure setup using Terraform and Jenkins

We will be learning how to execute Terraform scripts automatically using Jenkins pipeline. We will create EC2 instance using Terraform and Jenkins in AWS cloud.

  • Jenkins is up and running
  • Terraform is installed in Jenkins
  • Terraform files already created in your SCM.
I have provided my public repo as an example which you can use.

Create IAM role to provision EC2 instance in AWS 

Select AWS service, EC2, Click on Next Permissions

Type EC2 and choose AmazonEC2FullAccess as policy

Click on Next tags, Next Review
give some role name and click on Create role.

Assign IAM role to EC2 instance

Go back to Jenkins EC2 instance, click on EC2 instance, Security, Modify IAM role

Type your IAM role name my-ec2-terraform-role and Save to attach that role to EC2 instance.

Create Jenkins Pipeline 

Add parameters to the pipeline

Click checkbox - This project is parameterized, choose Choice Parameter

Add name as action
type apply and enter and type destroy as choices as it is shown below

Go to Pipeline section

Add below pipeline code

pipeline {
    agent any

    stages {
        stage('Checkout') {
            steps {
            checkout([$class: 'GitSCM', branches: [[name: '*/main']], extensions: [], userRemoteConfigs: [[url: '']]])            

        stage ("terraform init") {
            steps {
                sh ('terraform init') 
        stage ("terraform Action") {
            steps {
                echo "Terraform action is --> ${action}"
                sh ('terraform ${action} --auto-approve') 

Click on Build with Parameters and choose apply to build the infrastructure or choose destroy if you like to destroy the infrastructure you have built. 

Click on Build
Now you should see the console output if you choose apply.

Pipeline will look like below:

Login to AWS console, you should see the new EC2 instance created.