Terraform Examples

Here is some Terraform example to provision basic AWS infrastructure with custom VPC, EC2 instances, ELB, also EBS and EFS volumes.

As of June, 2019, the code is not modularised, no state management for more than one developer working with git and considered as very initial version.

Get Started

Steps to start using it on a fresh AWS account

Create User

Go to AWS Console
IAM - add user
type in your key_name
Programmatic access
AWS Management Console access
Custom password
Require password reset: no
Administrator Access group: my-admin

Update Credentials

cp secrets.tf.example secrets.tf

Go to AWS console, IAM section
Find your key name
Secret key
Access key

variable "key_name" {
  type    = string
  default = "your-key-name"
}

variable "secret_key" {
  type    = string
  default = "your-secret-key"
}

variable "access_key" {
  type    = string
  default = "your-access-key"
}

Run it

terraform apply
terraform destroy

or useful for tests to start from scratch - and take a break :)

terraform destroy -auto-approve && terraform apply -auto-approve

Apply specific module

terraform apply -target=module.route53

P.S. as of Aug, 2019, Route53 is experimental and hardcoded

Install a new module

terraform init

How ELB works

mac:~ $ curl http://my-terraform-elb-227091730.us-east-1.elb.amazonaws.com
Apache server ip-10-0-178-82.ec2.internal reached!
mac:~ $ curl http://my-terraform-elb-227091730.us-east-1.elb.amazonaws.com
Apache server ip-10-0-178-82.ec2.internal reached!
mac:~ $ curl http://my-terraform-elb-227091730.us-east-1.elb.amazonaws.com
Apache server ip-10-0-105-163.ec2.internal reached!
mac:~ $

How volumes work

[ec2-user@ip-10-0-168-252 ~]$ df -m
Filesystem                                    1M-blocks  Used     Available Use% Mounted on
devtmpfs                                            391     0           391   0% /dev
tmpfs                                               410     0           410   0% /dev/shm
tmpfs                                               410    11           400   3% /run
tmpfs                                               410     0           410   0% /sys/fs/cgroup
/dev/xvda2                                        10228  1138          9091  12% /
/dev/xvdh                                           976     3           907   1% /app
fs-d3c78030.efs.us-east-1.amazonaws.com:/ 8796093022207     0 8796093022207   0% /nfs
tmpfs                                                82     0            82   0% /run/user/1000
[ec2-user@ip-10-0-168-252 ~]$

Output

Terraform output variables

Apply complete! Resources: 19 added, 0 changed, 0 destroyed.

Outputs:

efs_dns_name = fs-42b1f6a1.efs.us-east-1.amazonaws.com
elb_dns = my-terraform-elb-633456504.us-east-1.elb.amazonaws.com
public_dns = ec2-54-162-71-214.compute-1.amazonaws.com
public_dns2 = ec2-3-80-248-69.compute-1.amazonaws.com

Connect to EC2

ssh -i your.key ec2-user@server1

Setup Cloudwatch Alarm for Higher Than 0 Estimated Bill in AWS

Cloudwatch

Billing Preferences

Receive PDF Invoice By Email

Receive Free Tier Usage Alerts - [email protected]

Receive Billing Alerts

Cloudwatch

Billing

Create Alarm

EstimatedCharges

send notification - [email protected]

Cloudwatch

Billing

Create Alarm

"Total Estimated Charge"

send notification - [email protected]

References

Create a first EC2 instance - https://www.youtube.com/watch?v=RA1mNClGYJ4

Inline vs discrete security groups - http://cavaliercoder.com/blog/inline-vs-discrete-security-groups-in-terraform.html

Create a VPC - https://www.youtube.com/watch?v=IxA1IPypzHs

Use Bash in Terraform for EBS volumes - http://www.sanjeevnandam.com/blog/ec2-mount-ebs-volume-during-launch-time

Mount EFS volume using Bash - https://cwong47.gitlab.io/technology-terraform-aws-efs/

Modularize Terraform - https://coderbook.com/@marcus/how-to-split-and-organize-terraform-code-into-modules/

Book: Terraform Up and Running by Yevgeniy Brikman

laimison / terraform-examples Goto Github PK