prompter: Create a snippet of Terraform HCL code that create an AWS autoscaling group, and an ALB in front to expose an application to internet.

assistant: Sure, here's an example Terraform HCL code that creates an AWS Autoscaling Group and an Application Load Balancer to expose an application to the internet:
``` 
# Configure the AWS provider
provider "aws" {
  region = "us-east-1"
}

# Create a security group to allow traffic to the ALB
resource "aws_security_group" "alb_sg" {
  name_prefix = "alb_sg"
  ingress {
    from_port = 80
    to_port = 80
    protocol = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }
}

# Create an ALB and target group
resource "aws_lb" "alb" {
  name               = "example-alb"
  internal           = false
  load_balancer_type = "application"

  subnets = ["subnet-12345678", "subnet-87654321"]

  security_groups = [aws_security_group.alb_sg.id]

  tags = {
    Environment = "production"
  }
}

resource "aws_lb_target_group" "target_group" {
  name        = "example-target-group"
  port        = 80
  protocol    = "HTTP"
  vpc_id      = "vpc-12345678"

  health_check {
    path = "/health"
  }

  tags = {
    Environment = "production"
  }
}

# Create an autoscaling group
resource "aws_launch_configuration" "launch_configuration" {
  name_prefix   = "example-lc-"
  image_id      = "ami-12345678"
  instance_type = "t2.micro"

  # Other settings here (e.g. security groups, userdata, etc.)
}

resource "aws_autoscaling_group" "autoscaling_group" {
  name                      = "example-asg"
  launch_configuration      = aws_launch_configuration.launch_configuration.id
  target_group_arns         = [aws_lb_target_group.target_group.arn]
  health_check_type         = "EC2"
  min_size                  = 1
  max_size                  = 3
  desired_capacity          = 2
  vpc_zone_identifier       = ["subnet-12345678", "subnet-87654321"]
  termination_policies      = ["Default"]
  wait_for_capacity_timeout = "10m"

  tags = {
    Environment = "production"
  }
}
``` 
Note that you will need to customize the settings for your specific use case (e.g. specify your own AMI ID, VPC ID, subnet IDs, etc.). This is just an example to give you an idea of how to create an autoscaling group with an ALB in Terraform.

assistant: Here's an example of Terraform HCL code that creates an AWS Autoscaling Group with a Launch Configuration, and an Application Load Balancer (ALB) to expose an application to the internet:
```
provider "aws" {
  region = "us-west-2"
}

resource "aws_launch_configuration" "example" {
  name_prefix   = "example-lc"
  image_id      = "ami-0c55b159cbfafe1f0"
  instance_type = "t2.micro"
  user_data     = <<-EOF
                  #!/bin/bash
                  echo "Hello, World" > index.html
                  nohup busybox httpd -f -p 80 &
                  EOF
}

resource "aws_autoscaling_group" "example" {
  name                 = "example-asg"
  launch_configuration = aws_launch_configuration.example.id
  min_size             = 1
  max_size             = 3
  desired_capacity     = 2

  tag {
    key                 = "Name"
    value               = "example-asg"
    propagate_at_launch = true
  }
}

resource "aws_lb" "example" {
  name               = "example-lb"
  internal           = false
  load_balancer_type = "application"

  subnets = ["subnet-0e6ba8e39d47d1b61", "subnet-054fa8c06be95d9ed"]

  security_groups = [aws_security_group.lb_sg.id]

  tags = {
    Name = "example-lb"
  }
}

resource "aws_security_group" "lb_sg" {
  name_prefix = "example-lb-sg"

  ingress {
    from_port   = 80
    to_port     = 80
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }
}

resource "aws_lb_listener" "http" {
  load_balancer_arn = aws_lb.example.arn
  port              = 80
  protocol          = "HTTP"

  default_action {
    type             = "forward"
    target_group_arn = aws_lb_target_group.example.arn
  }
}

resource "aws_lb_target_group" "example" {
  name_prefix      = "example-tg"
  port             = 80
  protocol         = "HTTP"
  vpc_id           = "vpc-12345678"
  target_type      = "instance"
  health_check {
    path = "/"
  }
}

resource "aws_autoscaling_attachment" "example" {
  autoscaling_group_name = aws_autoscaling_group.example.name
  alb_target_group_arn   = aws_lb_target_group.example.arn
}
```

This code creates an Autoscaling Group with a Launch Configuration that creates EC2 instances with an Apache server running a simple "Hello, World" web page on port 80. The Autoscaling Group has a minimum of 1 instance, a maximum of 3 instances, and a desired capacity of 2 instances.

An Application Load Balancer is created and attached to the Autoscaling Group. The ALB listens on port 80 and forwards traffic to the instances using a Target Group that performs a health check on the "/" path. The security group for the ALB is created to allow incoming traffic on port 80 from any IP address.

You can modify the values of the resources to fit your needs, such as changing the region, image ID, instance type, subnets, and VPC ID.

assistant: Here is a sample of Terraform HCL code that would provision the core scalable architecture you described:

resource "aws_lb" "example" {
  name               = "example"
  internal           = false
  load_balancer_type = "application"
  security_groups    = [aws_security_group.lb_security_group.id]
  subnets            = aws_subnet.public.*.id

  enable_deletion_protection = true

  access_logs {
    bucket  = aws_s3_bucket.lb_logs.bucket
    prefix  = "example-lb"
    enabled = true
  }
}

resource "aws_lb_target_group" "example" {
  name     = "example"
  port     = 80
  protocol = "HTTP"
  vpc_id   = aws_vpc.main.id
}

resource "aws_lb_listener" "example" {
  load_balancer_arn = aws_lb.example.id
  port              = "80"
  protocol          = "HTTP"

  default_action {
    target_group_arn = aws_lb_target_group.example.id
    type             = "forward"
  }
}

resource "aws_autoscaling_group" "example" {
  launch_configuration = aws_launch_configuration.example.id
  vpc_zone_identifier  = aws_subnet.private.*.id

  target_group_arns = [aws_lb_target_group.example.arn]
  health_check_type = "ELB"

  min_size = 2
  max_size = 10

  tag {
    key                 = "Name"
    value               = "example"
    propagate_at_launch = true
  }
}

resource "aws_launch_configuration" "example" {
  # ...
}

# Additional resources and variables omitted for brevity

The launch configuration would need to specify things like the AMI, instance type, SSH key, etc. to use
Scaling policies would need to be configured on the ASG to define when/how to scale
The ALB listeners would likely have additional rules or actions defined
The ALB target group would need to specify a health check for the ASG instances
Input variables could be used for things like the VPC ID, subnet IDs, resource names/prefixes, instance types, etc. to make the module more reusable

Overall this provides the core infrastructure components, but specifics around the application architecture would still need to be defined via additional details and variables. Let me know if you would like me to elaborate on any additional aspects or provide a more full example.