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launching aws elb instace using terraform

As per your requirement of creating Elastic Loadbalancer, using terraform. You will need to create the following resources. If you already have the EC2 instance created and just want to attach them to ELB.

- Create Target Group

- Create ELB

- Assign the Target Group to your ELB

- Register your existing instance to your Target Group

If you don't have any instance created,

- Create Target Group

- Create ELB

- Assign the Target Group to your ELB

- Create Launch Template/Configuration

- Create ASG, assign the ELB to ASG

- The new instance created through ASG will auto-register to the ELB target group.

Terraform Resource example,

Launch Configuration

resource "aws_launch_configuration" "Your_Launch_Configuration" {

  name                 = "launch_conf_name"

  instance_type        = "Instance_Type"

  image_id             = "AMI_image_id"

  key_name             = "Key_Name"

  security_groups      = "security_groups_id"

  user_data            = "User Data"

  iam_instance_profile = "Instance IAM Role"

}

Auto Scaling Group

resource "aws_autoscaling_group" "Your_ASG" {

  name                 = "ASG Name"

  launch_configuration = aws_launch_configuration.Your_Launch_Configuration.id

  max_size             = "Max size"

  min_size             = "Min Size"

  desired_capacity     = "Desired Capacity"

  vpc_zone_identifier  = "Your Subnet List"

  tags = [{

    "key"                 = "Name"

    "value"               = "ASG Name"

    "propagate_at_launch" = true

  }]

  health_check_grace_period = "300"

  target_group_arns         = "set of your ELB target Group"

}

Load Balancer Target Group

resource "aws_load_balancer_target_group" "Your_target_group" {

  name     = "Target_group_name"

  port     = "80"

  protocol = "HTTP"

  vpc_id   = "Your_vpcid"

  tags = {

    name = "Target_group_name"

  }

  health_check {

    enabled  = true

    interval = 300  # health check interval

    protocol = "HTTP"  

    timeout  = 300  # timeout seconds

    path     = "/" # your health check path

  }

}

Load Balancer

resource "aws_load_balancer" "your_load_balancer" {

  name               = load_balancer_name

  load_balancer_type = "application"

  internal           = true # if not internet facing

  subnets            = ["List of your subnet id"]

  security_groups    = ["List of your security group id"]

  tags = {

    "name" = load_balancer_Target_group_name

  }

}

Load Balancer Listner

resource "aws_load_balancer_listener" "your_load_balancer_Listner" {

  load_balancer_arn = listner_load_balancer_arn   #arn of your load balancer

  port              = "80"

  protocol          = "http"

  default_action {

    target_group_arn = listner_Target_group_arn  # arn of your target group

    type             = "forward"

  }

}