Books

• The Terraform Book
• Getting Started with Terraform, 2nd ed.
• Terraform in Action
• Getting Started with Terraform, 2nd ed.
• Infrastructure as Code

Community

• Terraform Bug Tracker
• Terraform Community Modules
• Terraform Module Registry
• Terraform Best Practices - open-source ebook
• Terraform PDF Doc
• Complete Terraform documentation as PDF files (Updated nightly)

Community Modules

Miscellaneous

• terraform-aws-modules - Collection of Terraform AWS modules supported by the community (includes official AWS modules).
• terraform-digitalocean-droplet - Terraform module for managing DigitalOcean Droplets and related resources.
• rancher-terraform-digitalocean - Rancher server on digitalocean.
• segmentio/stack - Configures production infrastructure with AWS, Docker, and ECS.
• terraform-aws-alb - Created Application load-balancer on AWS (verified module).
• terraform-aws-atlantis - Creates Terraform configurations for running Atlantis on AWS Fargate. Github, Gitlab and BitBucket are supported.
• terraform-aws-autoscaling - Creates Auto-Scaling Groups and Launch Configurations (verified module).
• terraform-aws-ecr - Manages Docker container registries on AWS ECR.
• terraform-aws-efs - Defines an EFS Filesystem.
• terraform-aws-eks - Creates Elastic Kubernetes Service on AWS (very popular module).
• terraform-aws-elb - Created Elastic load-balancer on AWS (verified module).
• terraform-aws-key-pair - Automatically Generate SSH Key Pairs (Public/Private Keys).
• terraform-aws-postgresql-rds - Creates PostgreSQL on RDS.
• terraform-aws-rds - Creates RDS resources on AWS (verified module).
• terraform-aws-secure-baseline - Set up your AWS account with the secure baseline configuration based on CIS Amazon Web Services Foundations.
• terraform-aws-security-group - Creates EC2-VPC security groups on AWS (verified module).
• terraform-aws-ssh-bastion-service - Terraform plan to deploy ssh bastion as a stateless service on AWS.
• terraform-aws-vpc - Creates VPC resources on AWS (verified and very popular module).
• terraform-azurerm-aks - Create AKS resources on Azure.
• terraform-azurerm-iis - Install IIS Server on Azure VM instance.
• terraform-azurerm-mysql - Create MySql Database on Azure.
• terraform-azurerm-redis - Create Redis on Azure.
• terraform-azurerm-sqlserver - Create SQl Server Database on Azure.
• terraform-ecs-jenkins - Provisions Jenkins on AWS ECS using Terraform.
• terraform-google-project-factory - Opinionated Google Cloud Platform project creation and configuration with Shared VPC, IAM, APIs, etc.
• tf_aws_availability_zones_cfn - Gets availability zones for your AWS region/account from Cloudformation.
• tf_aws_bastion_s3_keys - Creates bastion hosts on AWS EC2.
• tf_aws_coreos_ami - Easy way to lookup CoreOS AMIs with terraform.
• tf_aws_nat - NAT instances for AWS.
• terraform-static-website-s3-cloudfront - Creates static websites on AWS S3 & Cloudfront based on variables.

Editor Plugins

Miscellaneous

• Terraform-lsp
• Vim-Terraform
• Vim-Terraform-Completion

Libraries

Miscellaneous

• pyhcl - HCL parser in Python
• rhcl - Pure Ruby HCL parser

Official Resources

• Terraform GitHub Actions
• Introduction to Terraform
• Terraform Documentation
• Hashicorp Terraform Blog
• Terraform learn

Private Module Registries

Miscellaneous

• anthology - Private Terraform registry implementation as an alternative to the official registry.
• citizen - Private Terraform Module Registry
• terraform-simple-registry - Simple implementation of the Terraform registry protocols.

Providers

Miscellaneous

• terraform-provider-healthchecksio - Provider to manage healthchecks.io resources.
• terraform-provider-linode - Plugin for Linode.
• terraform-provider-pingdom - Provider to manage Pingdom resources.
• terraform-provider-spinnaker - Manage Spinnaker applications and pipelines with Terraform.
• terraform-provider-stripe - Provider for Stripe.
• terraform-provider-uptimerobot - Provider to manage uptimerobot resources.
• terraform-provider-vaulted - Encrypted HashiCorp Vault secrets via Terraform that can be stored in SCM such as Git.
• terraform-provider-azuredevops - Provider for Azure DevOps (VSTS).
• terraform-provider-aws - Plugin for Amazon Web Services.

Talks

Miscellaneous

• Building Scalable, Repeatable Infrastructure in the Cloud with Terraform - Demonstrates how Terraform enables the practice of Infrastructure as Code by deploying TeamCity in AWS using a hosted PostgreSQL.
• Creating a Google Compute Instance with Terraform - Example of creating a Google Compute Instance with Terraform code.
• Creating a Terraform Provider for Just About Anything - Learn how to contribute to a Terraform provider or create your own from this walkthrough.
• Evolving Your Infrastructure with Terraform - CTO of OpenCredo provides an extensive look at using Terraform in the real-world with the help of some interesting use-cases.
• Going Multi-Cloud with Terraform and Nomad
• How to Build Reusable, Composable, Battle tested Terraform Modules - Yevgeniy Brikman talks about how to write Terraform code so that it is reusable, composable and testable. The presentation focuses on Terraform modules, but also provides a brief and clear explanation of what problem Terraform was created to solve and a short demo of Terraform basics (~39 min, October 2017).
• How to Extend the Terraform Provider List - In this talk, Paul will walk through the creation of a terraform provider.
• Production ChaosMonkey with Terraform - How DigitalOcean uses Terraform to run production integration tests.
• Running a Terraform Environment at Scale - Running Terraform at scale with hundreds of AWS accounts.
• Setup Continuous Integration for a Terraform module - Example of using CI with Kitchen-Terraform to test, tag and publish our Terraform module which creates a Google Compute Instance.
• State of Terraform Providerland - How Terraform providers work and how to write one.
• Terraform At Scale - How Segment uses Terraform.
• Terraform w/ Lee Trout - Focuses on development patterns and how to effectively structure Terraform code.
• Terraforming the Composable World - Integrating Terraform with an on-premise bare metal provisioning.
• Test and verify a Google Compute Instance with Kitchen-Terraform - Example of using Kitchen-Terraform to test our Terraform code that created a Google Compute.
• Untangling Terraform Through Refactoring - How to refactor your Terraform code in a careful way with minimum risk.
• Webinar: Multi-Cloud, One Command with Terraform - Provisioning hybrid cloud infrastructure using Terraform.
• Creating a Terraform Provider for Just About Anything - Learn how to contribute to a Terraform provider or create your own from this walkthrough.

Terraform Enterprise

Miscellaneous

• terraform-enterprise-cli - Terraform Enterprise Command Line Interface.
• terraform-enterprise-client - Terraform Enterprise API Ruby Client and Command Line tool.
• terraform-enterprise-migrator - Script for migrating Terraform Enterprise environments from Legacy to new version of Terraform Enterprise.

Testing

Miscellaneous

• kitchen-terraform - Provides a set of Test Kitchen plugins which enable a system to use Test Kitchen to converge a Terraform configuration and verify the resulting Terraform state with InSpec controls.
• rspec-terraform - RSpec tests for your Terraform modules.
• terraform_validate - Assists in the enforcement of user-defined standards in Terraform.
• terratest - Terratest is a Go library that makes it easier to write automated tests for your infrastructure code.

Tools

Miscellaneous

• geopoiesis - Specialized continuous integration and deployment tool for modern declarative infrastructure provisioning and management.
• modules.tf - Infrastructure as code generator - from visual diagrams created with Cloudcraft.co to Terraform. Source code.
• atlantis - Unified workflow for collaborating on Terraform through GitHub.
• blast radius - Interactive visualizations of Terraform dependency graphs.
• fogg - A tool for eliminating toil in managing terraform repositories.
• iam-policy-json-to-terraform - Small tool to convert an IAM Policy in JSON format into a Terraform aws_iam_policy_document
• k2tf - Kubernetes YAML to Terraform HCL converter.
• json2hcl - Convert JSON to HCL and vice versa.
• para - The missing 3rd-party plugin manager and a "swiss army knife" for Terraform/Terragrunt - just 1 tool to facilitate all workflows.
• pre-commit-terraform - pre-commit git hooks to take care of Terraform configurations (auto-format, validate, update docs).
• pretf - drop-in Terraform wrapper that generates Terraform configuration with Python. See pretf documentation
• python-terrafile - Systematically manage external modules from Github for use in Terraform.
• prettyplan - Prettyplan (available online here) is a small tool to help you view large Terraform plans with ease.
• ruby-terraform - Simple Ruby wrapper for invoking terraform commands.
• scenery - Another Terraform plan output prettifier.
• scratchrelaxtv - Simple Python tool to help with module development - extract vars from main.tf to generate variables.tf and make module usage stub from variables.tf.
• tads-boilerplate - The power of Ansible and Terraform + the simplicity of Docker Swarm = Infrastructure as Code and DevOps best practices.
• tau - Tau is a thin wrapper on top of terraform to manage multiple deployments, dependencies and secrets.
• terraboard - Web dashboard to inspect Terraform States.
• terraboot - DSL to generate a terraform configuration and run it.
• terrafile - Systematically manage external modules from Github for use in Terraform (written in Go).
• terrafile - Systematically manage external modules from Github for use in Terraform (written in Ruby).
• terraform-landscape - Improve Terraform's plan output to be easier to read and understand.
• terraform-plan-parser - Command line utility and JavaScript API for parsing stdout from terraform plan and converting it to JSON.
• terraform-provisioner - Tool for managing multiple provisions of the same Terraform scripts.
• terraform-rake-tasks - Shared Rake tasks for managing terraform plans.
• terraformer - CLI tool to generate terraform files from existing infrastructure. Infrastructure to Code. Supported few providers.
• terraforming - Export existing AWS resources to Terraform style (tf, tfstate). Similar to terraformer.
• terragrunt - Terragrunt is a thin wrapper for Terraform that supports locking for Terraform state and enforces best practices.
• terrahelp - Command line utility aimed at providing supplementary functionality which can sometimes prove useful when working with Terraform.
• tfenv - Terraform version manager inspired by rbenv.
• tfjson - Utility to read in a Terraform plan file and dump it out in JSON.
• tfscaffold - Framework for controlling multi-environment multi-component terraform-managed AWS infrastructure.
• tfschema - Schema inspector for Terraform providers.
• tfupdate - Update version constraints in your Terraform configurations.
• tfwrapper - Rubygem providing rake tasks for running Hashicorp Terraform sanely.
• xterrafile
• astro - Astro is a tool for managing multiple Terraform executions as a single command.
• terrascan - Collection of security and best practice test for static code analysis of terraform templates
• Checkov - Terraform static analysis tool for terraform>=0.12
• tfmask - Terraform utility to mask select output from terraform plan and terraform apply
• tflint - Terraform linter for detecting errors that can not be detected by terraform plan

Tutorials and Blog Posts

Azure

• New Terraform Azure Automation Resources - Azure Automation.
• Terraforming Azure PaaS - Deploy PaaS Resources on Azure.
• Learning HashiCorp Terraform - Guide for Azure.

Beginner Guides

• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• Using Terraform for Cloud Deployments - Part 1 - Provisioning an EC2 instance.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
• A Comprehensive Guide to Terraform - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.

How-To

• Deploying Discourse with Terraform - Shows how Terraform can create a running instance of Discourse on DigitalOcean in one command.
• Easily Deploy A Seneca Microservice to ECS with Wercker and Terraform: Part I - deploy-a-seneca-microservice-to-ecs-with-wercker-and-terraform-part-ii/) & III - Illustrates how Terraform can be incorporated into a microservice deployment pipeline.
• Tutorial: How to Use Terraform to Deploy OpenStack Workloads - Illustrates how easy it is to use the OpenStack Terraform provider to deploy a web server.
• Zero Downtime Updates with HashiCorp Terraform - Ensuring zero downtime of your infrastructure.
• Easily Deploy A Seneca Microservice to ECS with Wercker and Terraform: Part I - deploy-a-seneca-microservice-to-ecs-with-wercker-and-terraform-part-ii/) & III - Illustrates how Terraform can be incorporated into a microservice deployment pipeline.
• Terraforming 1Password - How 1Password migrated from CloudFormation to Terraform.
• Zero Downtime Updates with HashiCorp Terraform - Ensuring zero downtime of your infrastructure.

Miscellaneous

• Sharing data between Terraform configurations - Illustrates how to use remote state to share data between Terraform configurations.
• The Segment AWS Stack - Shows the behind the scenes of the infrastructure powered by Terraform that solved The Million Dollar Engineering Problem at Segment.
• Top 3 Terraform Testing Strategies for Ultra-Reliable Infrastructure-as-Code
• Two Weeks with Terraform - Some hard-earned experience from using Terraform in the wild, and some operational wisdom.
• Terraform: Beyond the Basics with AWS - Explanation of a demo using Terraform to provision a sample AWS architecture.

Multi-Environment Configuration

• Terraform Design Patterns: the Terrafile - Managing Terraform modules and their versions within Terraform projects with Terrafile.
• Terraform, VPC, and why you want a tfstate file per env - Some gotchas surrounding using Terraform in large projects with multiple environments and how to avoid them.
• Using Pipelines to Manage Environments with Infrastructure as Code - Explains different approaches for building a pipeline to handle infrastructure changes moving from one environment to the next.
• Terraform Design Patterns: the Terrafile - Managing Terraform modules and their versions within Terraform projects with Terrafile.

Writing Custom Providers

• Creating custom terraform providers - Guide for creating custom providers.
• Writing a Terraform provider - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.
• Creating custom terraform providers - Guide for creating custom providers.