Certainly! Here's a basic Terraform cheat sheet to help you quickly reference some common commands and concepts:
Terraform Commands:
terraform init: Initialize a new or existing Terraform working directory.
terraform plan: Generate and show an execution plan for changes to be applied.
terraform apply: Apply the changes required to reach the desired state of the configuration.
terraform destroy: Destroy the Terraform-managed infrastructure.
terraform validate: Check whether the configuration is valid.
terraform fmt: Reformat your configuration files to a canonical format.
terraform state: Advanced state management commands.
Terraform Configuration:
provider: Specifies the cloud or infrastructure provider (e.g., AWS, Azure, Google Cloud).
resource: Defines the infrastructure components to be created (e.g., virtual machines, databases, networks).
variable: Declares input variables for the configuration.
output: Declares output values to be shown after applying the configuration.
module: Defines a reusable Terraform configuration.
Terraform Language:
HCL (HashiCorp Configuration Language): The language used to write Terraform configurations.
Variables: Input parameters that customize Terraform configurations.
Expressions: Dynamic constructs used to customize configurations.
Functions: Built-in functions for manipulating and querying data.
Providers: Plugins that Terraform uses to manage infrastructure.
Terraform Best Practices:
Infrastructure as Code (IaC): Treat infrastructure as code, enabling versioning, testing, and automation.
Modularity: Use modules to encapsulate and reuse infrastructure configurations.
State Management: Understand and manage Terraform state to avoid conflicts and ensure consistency.
Version Control: Store Terraform configurations in version control systems like Git.
Documentation: Document your Terraform configurations and infrastructure.
Here are 30 essential Terraform commands that are commonly used:
terraform init: Initialize a new or existing Terraform working directory by downloading and installing provider plugins.
terraform plan: Generate and show an execution plan for changes to be applied, highlighting the actions that will be taken.
terraform apply: Apply the changes required to reach the desired state of the configuration, executing the planned actions.
terraform destroy: Destroy the Terraform-managed infrastructure, deleting all resources defined in the configuration.
terraform validate: Check whether the configuration is valid and internally consistent.
terraform fmt: Reformat your configuration files to a canonical format, making it easier to read and understand.
terraform get: Download and install modules defined in the root module.
terraform graph: Create a visual representation of the configuration and its dependencies as a graph.
terraform import: Import existing infrastructure into your Terraform state.
terraform output: Show the outputs of the current Terraform configuration.
terraform refresh: Update the state file against real resources.
terraform show: Show the current state or a saved plan.
terraform state: Advanced state management commands for manual state manipulation.
terraform taint: Mark a resource instance as tainted, forcing it to be destroyed and recreated on the next apply.
terraform untaint: Remove the tainted state from a resource instance.
terraform version: Show the current Terraform version.
terraform workspace: Workspace management commands for managing multiple workspaces.
terraform console: Interactive console for evaluating expressions.
terraform force-unlock: Release a stuck lock on the state.
terraform login: Obtain and save an API token for Terraform Cloud.
terraform logout: Remove locally-stored credentials for Terraform Cloud.
terraform import: Import existing infrastructure into your Terraform state.
terraform output: Show the outputs of the current Terraform configuration.
terraform providers: Show the providers required for this configuration.
terraform state list: List all resources in the Terraform state.
terraform state mv: Move an item in the Terraform state.
terraform state pull: Pull current state and output to stdout.
terraform state push: Update remote state from a local state file.
terraform state replace-provider: Replace provider in the Terraform state.
terraform state show: Show the attributes of a single resource in the Terraform state.
These commands cover a wide range of Terraform operations, from initializing a project to managing the state and interacting with infrastructure. Always refer to the official Terraform documentation for the most up-to-date information on these commands and their usage.
This cheat sheet provides a quick reference for some common Terraform commands, configuration elements, language features, and best practices. For more detailed information, always refer to the official Terraform documentation and resources.