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Deployed Architecture

alt text

Terrafrom

Terraform is a tool for building, changing, and versioning infrastructure safely and efficiently. Terraform can manage existing and popular service providers as well as custom in-house solutions.

Configuration files describe to Terraform the components needed to run a single application or your entire datacenter. Terraform generates an execution plan describing what it will do to reach the desired state, and then executes it to build the described infrastructure. As the configuration changes, Terraform is able to determine what changed and create incremental execution plans which can be applied.

Installing

MAC OS

brew install terraform

Verify the installation

terraform version

How to run Demo project

clone git repo

Clone git repo in your computer

git clone https://github.com/rahulit1991/terraform-demo.git

generate SSH key pair

Once repo clone, switch into repo and generate key pair using following command:

ssh-keygen -f <keypair-name>

Rename SSH key pair

Once Keypair generated, rename private key it with extention

mv <keypair-name> <keypair-name>.pem

Generate AWS_ACCESS_KEY and AWS_SECRET_KEY

Generate programmatic Access using this link:

https://docs.aws.amazon.com/IAM/latest/UserGuide/id_users_create.html#id_users_create_console

update terraform.tfvars file

create terraform.tfvars file with following variables and assign approprate values:

1. AWS_REGION
2. AWS_ACCESS_KEY
3. AWS_SECRET_KEY
4. vpc-cidr-block
5. key_path
6. az1
7. az2
8. az3
9. public-subnet1
10. public-subnet2
11. public-subnet3
12. private-subnet1
13 private-subnet2
14. private-subnet3

Init configuration

Initialize provider before apply configuration. move into project directory and run below command

terraform init

Note: above command required only once for particular directory.It may takes 5-10 minutes to complete successfully.

Plan Configuration

Before apply changes. best practice, plan terraform configuration

terraform plan

Apply Configuration

Apply configuration for deploy infrastructure

terraform apply

Output terraform deployment

Note output of this command.

terraform output

SSH into Bastion Instance (For MAC)

ssh-add -K <keypair-name>.pem 
ssh -A ubuntu@<instance_eip>

Destroy Configuration

If you want to destroy all configuration please run below command:

terraform destroy

Note: this command not recommanded. if you run this command it will remove all deployment at once.