Terraform Autoscaling
variables.tf
variable “count1” {
default = 1
}
variable “region” {
description = “AWS region for hosting our your network”
default = “us-east-1”
}
variable “key_name” {
description = “Key name for SSHing into EC2”
default = “newkey”
}
variable “amis” {
description = “Base AMI to launch the instances”
default = “ami-05fa00d4c63e32376”
}
main.tf
provider “aws” {
region = “us-east-1”
}
data “aws_availability_zones” “all” {}
### Creating EC2 instance
resource “aws_instance” “web” {
ami = var.amis
count = “${var.count1}“
key_name = “${var.key_name}“
source_dest_check = false
instance_type = “t2.micro”
}
### Creating Security Group for EC2
resource “aws_security_group” “instance” {
name = “terraform-example-instance”
ingress {
from_port = 8080
to_port = 8080
protocol = “tcp”
cidr_blocks = [“0.0.0.0/0”]
}
ingress {
from_port = 22
to_port = 22
protocol = “tcp”
cidr_blocks = [“0.0.0.0/0”]
}
}
## Creating Launch Configuration
resource “aws_launch_configuration” “example” {
image_id = var.amis
instance_type = “t2.micro”
security_groups = [“${aws_security_group.instance.id}“]
key_name = “${var.key_name}“
user_data = <<-EOF
#!/bin/bash
echo “Hello, World” > index.html
nohup busybox httpd -f -p 8080 &
EOF
lifecycle {
create_before_destroy = true
}
}
## Creating AutoScaling Group
resource “aws_autoscaling_group” “example” {
launch_configuration = “${aws_launch_configuration.example.id}“
availability_zones = [“us-east-1a”]
min_size = 2
max_size = 10
load_balancers = [“${aws_elb.example.name}“]
health_check_type = “ELB”
tag {
key = “Name”
value = “terraform-asg-example”
propagate_at_launch = true
}
}
## Security Group for ELB
resource “aws_security_group” “elb” {
name = “terraform-example-elb”
egress {
from_port = 0
to_port = 0
protocol = “-1”
cidr_blocks = [“0.0.0.0/0”]
}
ingress {
from_port = 80
to_port = 80
protocol = “tcp”
cidr_blocks = [“0.0.0.0/0”]
}
}
### Creating ELB
resource “aws_elb” “example” {
name = “terraform-asg-example”
security_groups = [“${aws_security_group.elb.id}“]
availability_zones = [“us-east-1a”]
health_check {
healthy_threshold = 2
unhealthy_threshold = 2
timeout = 3
interval = 30
target = “HTTP:8080/”
}
listener {
lb_port = 80
lb_protocol = “http”
instance_port = “8080”
instance_protocol = “http”
}
}
