ninfra

A terraform module that creates:

• A load balancer
• An auto scalling group
• 5 ububtu VM with Apache that serve "hello world"

Install

• Run those commands:

  # Tools
  brew install terraform
  brew install packer
  
  # Build Ububtu with Apache
  packer build apache-packer.json

• Create a KeyPair and save it on disk.

• Change image_id and key_name in main.tf

  module "ninfra" {
  source = "./infra"
  
  # Use the image_id created with:
  # packer build apache-packer.json
  # https://us-west-2.console.aws.amazon.com/ec2/v2/home?region=us-west-2#Images:visibility=owned-by-me;sort=name
  image_id = "ami-081c4a2dcf94faaa0"
  
  
  # Use the key-pair created in:
  # https://us-west-2.console.aws.amazon.com/ec2/v2/home?region=us-west-2#KeyPairs:sort=keyName
  key_name = "ssh-key"
  }

• Build the infra

  terraform init
  terraform apply

Test autoscalling

Remove instance by hand

• Go to EC2 instance dashboard
• Terminate a ninfra instance the

Make a instance unhealthy

• Find an instance ip on the EC2 instance dashboard

• Go to a terminal and ssh to that instance

  # Change acl of the key downloaded when keyPair was created.
  chmod 0600 ssh-key.pem.txt
  
  # Ssh to the instance.
  ssh -i ssh-key.pem.txt ubuntu@INSTANCE_IP
  
  # Kill apache.
  sudo killall -9 apache2

Monitoring

• EC2 instance dashboard
• Target group dashboard on the Targets tab.
• Auto Scalling dashboard
  • Activity History tab
  • Instances Tab
• Load Balancers dashboard - Enter the DNS Name in a browser to see Hello World

Uninstall

• Deregister ami-ninfra

• Destroy the infra

  terraform destroy