Auto scaling

If you've applied the patterns and followed the practices enumerated here, you are on the road to success. Unfortunately, success often comes more swiftly than you expect. A mention on Hacker News, Reddit, or Twitter can send waves of traffic your way. Let's take a look at how Amazon's auto scaling feature can help us to meet the demand in a cost effective way. First, we will define a launch configuration for our product—this should go into the instanceAZ1c.tf file:

resource "aws_launch_configuration" "asg_conf" {
  name = "book-asg-config"
  image_id = "ami-001e1c1159ccfe992"
  instance_type = "t2.micro"
}

Then, add an autoscaling group to the same file, which encompasses all AZs, so that the workload gets distributed evenly:

resource "aws_autoscaling_group" "book_group&quot...