initial

.gitignore

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+
+# Created by https://www.gitignore.io/api/terraform
+
+### Terraform ###
+# Local .terraform directories
+**/.terraform/*
+
+# .tfstate files
+*.tfstate
+*.tfstate.*
+
+# Crash log files
+crash.log
+
+# Ignore any .tfvars files that are generated automatically for each Terraform run. Most
+# .tfvars files are managed as part of configuration and so should be included in
+# version control.
+#
+*.tfvars
+
+
+# End of https://www.gitignore.io/api/terraform

.pre-commit-config.yaml

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+repos:
+  - repo: git://github.com/antonbabenko/pre-commit-terraform
+    sha: v1.7.3
+    hooks:
+      - id: terraform_fmt
+
+  - repo: git://github.com/pre-commit/pre-commit-hooks
+    sha: v1.4.0
+    hooks:
+      - id: check-merge-conflict

README.md

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+# Terraform AWS Autoscaling
+
+## :triangular_ruler: Naming Convention
+
+Common variables referenced in naming standards
+
+| Variable              | RegExp                          | Example                                                     |
+|:----------------------|:--------------------------------|:------------------------------------------------------------|
+| `<availability_zone>` | `[a-z]{2}-[a-z]{1,}-[1-2][a-f]` | `us-east-1a`, `us-west-2c`, `eu-west-1a`, `ap-northeast-1c` |
+
+---
+
+## :triangular_ruler: AWS - Resource Naming Standards
+
+* ALB
+
+| AWS Resource        | Resource Naming          | Comment              | Example                                 |
+|:--------------------|:-------------------------|:---------------------|:----------------------------------------|
+| ALB                 | `<app_name>-alb-private` | Tag `Tier = private` | `web-api-alb-private`                   |
+|                     | `<app_name>-alb-public`  | Tag `Tier = public`  | `web-api-alb-public`                    |
+| ALB Target group    | `<app_name>-<protocol>`  |                      | `web-api-alb-http`, `web-api-alb-https` |
+| ALB Security Groups | `<app_name>-alb`         |                      | `web-api-alb`                           |
+
+
+* ASG
+
+| AWS Resource        | Resource Naming             | Comment | Example                 |
+|:--------------------|:----------------------------|:--------|:------------------------|
+| ASG Security Groups | `<app_name>`                |         | `web-api`               |
+| ASG Launch Config   | `<app_name>-lc-<timestamp>` |         | `web-api-lc-1537774225` |
+| ASG Launch Template | `<app_name>-lt-<timestamp>` |         | `web-api-lt-1537774225` |
+
+---
+
+## :crystal_ball: Terraform Discovery module
+
+If you followed the naming conventions listed in [terraform-aws-vpc](https://github.com/Lowess/terraform-aws-vpc) you will find it useful to use this [terraform-aws-discovery](https://github.com/Lowess/terraform-aws-discovery) module. The idea of using a discovery module is to centralize `datasource` usage in a central place and keep the source code DRY.
+
+Here is an example usage:
+
+```hcl
+module "discovery" {
+  source              = "github.com/Lowess/terraform-aws-discovery"
+  aws_region          = var.aws_region
+  vpc_name            = var.vpc_name
+  ec2_ami_names       = ["<AMI-NAME>"]
+  ec2_ami_owners      = "<TEACHER-ACCOUNT-ID>"
+  ec2_security_groups = [...]
+}
+```
+
+> :point_up: If you do not what to use this module you are free to redefine the datasources you need but keep in mind that you will be rebuilding the wheel :ferris_wheel:
+
+---
+
+## 1. Create an `AWS ALB`
+
+Let's create an `ALB` and the related resources needed (security groups, listeners and target groups).
+
+* [aws_lb](https://www.terraform.io/docs/providers/aws/r/lb.html)
+* [aws_lb_target_group](https://www.terraform.io/docs/providers/aws/r/lb_target_group.html)
+* [aws_lb_listener](https://www.terraform.io/docs/providers/aws/r/lb_listener.html)
+* [aws_security_group](https://www.terraform.io/docs/providers/aws/r/security_group.html)
+* [aws_security_group_rule](https://www.terraform.io/docs/providers/aws/r/security_group_rule.html)
+
+![ALB](./docs/1-alb.png)
+
+## 2. Create the `AWS Autoscaling group`
+
+* [aws_security_group](https://www.terraform.io/docs/providers/aws/r/security_group.html)
+* [aws_security_group_rule](https://www.terraform.io/docs/providers/aws/r/security_group_rule.html)
+* [aws_launch_template](https://www.terraform.io/docs/providers/aws/r/launch_template.html)
+* [aws_autoscaling_group](https://www.terraform.io/docs/providers/aws/r/autoscaling_group.html)
+
+![ALB & ASG](./docs/2-alb-asg.png)
+
+## 3. Create policies to make the `AWS Autoscaling group` scale in/out
+
+* Visit the `Cloudwatch` service and discover what this service does
+
+> :point_up: Think about what's the best metric to use in order to adjust the size of the Autoscaling group
+
+* [aws_autoscaling_policy](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/autoscaling_policy)
+

main.tf

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+### Provider definition
+
+provider "aws" {
+  region = "${var.aws_region}"
+}
+
+### Module Main
+

outputs.tf

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+

variables.tf

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+