terraform

Terraform

This repository contains practice examples from books on Terraform written by James Turnbull, Yevgeniy Brikman. Also this repository contains practice examples from Udemy course on Terraform.

How to install Terraform in Ubuntu 18.04 LTS x86_64 machine

Terraform is available as a binary. It can be downloaded and installed by following below steps:

1. wget https://releases.hashicorp.com/terraform/0.12.9/terraform_0.12.9_linux_amd64.zip Before execting above command, please check which is the atest terraform version available. We can also download other versions from the above site.
2. unzip terraform_0.12.9_linux_amd64.zip
3. sudo chown root:root terraform
4. mv terraform /usr/local/bin/
5. terraform --version OR terraform version

Configuration of AWS secret credentials.

To enable terraform to communicate to AWS cloud platform, we configure AWS secret credentials. Here is the link

.gitignore file

• We have excluded .terraform directory which gets generated after terraform init command. This directory contains all backend plugins used by terraform to communicate to specified provider (AWS/Azure/etc). If we change any provider configuration, then we need to execute terraform init again to update .terraform files to connect successfully.
• We have excluded *.dot file which may contain confidential information. This file is generated to view graphical images of our infra.
• We have excluded *.plan file which may contain confidential information. This file is generated using terraform plan command to output plans before implementing changes using terraform apply.
• We have excluded terraform.tfstate and terraform.tfstate.backup files to exclude state files.
• We have excluded *.pub files to exclude ssh public keys.
• We have excluded terraform.tfvars file to exclude secret variables.

Viewing terraform graphs.

• To generate dot file. terraform graph > exapmle.dot
• To convert dot file to svg image. we need to get installed graphviz te get the dot binary. Here is the guide. dot example.dot -Tsvg -o example.svg
• To view svg image in Eye of Gnome image viewer in Ubuntu. eog example.svg

AWS EC2 instance AMI reference for an Ubuntu VM

To know AMI details for the AWS EC2 instance in a particular region, we can refer this website.