Terraform Quick Reference Guide

This comprehensive guide serves as a practical reference for Terraform, covering everything from core architecture and essential commands to syntax patterns and industry best practices. Whether you're new to Infrastructure as Code (IaC) or an experienced practitioner, you'll find valuable snippets, real-world examples, and curated learning resources to enhance your Terraform skills.

While not intended as a complete tutorial, this guide complements the official to see the steps to become a Terraform expert.

Terraform architecture

. For example:

• from tutorials in the Terraform documentation. This is a great resource to learn through practical examples and use cases.
  
  
  

  
  
  
  Variables and References
  

  
  
  
  
  
  • You can specify descriptions, default values, types and constraints, validation rules, and sensitive values.
  
  
  • Also you can use variables to reference other variables, locals, and data sources.
  
  
  • Variables can be passed in at runtime, from a file, from environment variables, or from a remote secrets management service.
  
  
  • Variables types can be string, number, bool, list (or tuple), set, map (or object), one special type that has no type: null.
  
  
  • see more at .
    
    
    
    
    
    
    

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    # Workspace commands
    
    terraform workspace new dev
    
    terraform workspace select prod
    
    terraform workspace list
    
    terraform workspace delete dev
    
    

    
    
    
    
    
    
    
    

    
    
    
    Importing Existing Infrastructure
    

    
    
    
    
    
    
    

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    # Terraform Import And Outputs
    
    # import EC2 instance with id i-abcd1234 into the Terraform resource named "new_ec2_instance" of type "aws_instance"
    
    terraform import aws_instance.new_ec2_instance i-abcd1234 
    
    # same as above, imports a real-world resource into an instance of Terraform resource
    
    terraform import 'aws_instance.new_ec2_instance[0]' i-abcd1234
    
    # List all outputs as stated in code
    
    terraform output
    
    # List out a specific declared output
    
    terraform output instance_public_ip
    
    # List all outputs in JSON format
    
    terraform output -json
    
    

    
    
    
    
    
    
    
    

    
    
    
    Modules
    

    
    
    

    Terraform modules are a way to package and reuse infrastructure code. They are a fundamental concept in Terraform that allow you to create reusable, modular, and maintainable infrastructure.

    
    
    

    In Terraform you can use modules from the

  
  
  
  
  
  
  
  
  
  
  
  
  
  
  • Terraform Commands Cheat Sheet
  
  
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