Everything about Terraform
This text discusses various aspects of terraform, including installation, configuration, remote backend, modules, and common issues. It also compares AWS and Azure setups.
- Today's topic is about Terraform and its various aspects.
- Advantages of Terraform
- To use terraform, first initialize the provider and then write the terraform files.
- Terraform initialization and required providers
- Terraform requires authentication with the cloud provider CLI before use.
- Creating output.tf file in terraform
- Do not store or manipulate terraform state files locally
- Always store the state file in a centralized location like AWS S3 for better management and avoid conflicts.
- Implementing a remote backend using AWS S3 in Terraform
- State file corruption and manual changes to cloud provider are major challenges with Terraform
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This text discusses various aspects of terraform, including installation, configuration, remote backend, modules, and common issues.
It also compares AWS and Azure setups.
Today's topic is about Terraform and its various aspects.
- Covering topics like installation, configuration, writing a first Terraform project, remote backend for state files, Terraform modules, and common problems with Terraform and state files.
- Also discussing practical examples of Terraform setup and how it applies to different cloud providers like AWS and Azure.
- Explaining the advantages of using Terraform as a tool for managing infrastructure and its flexibility in supporting existing and new cloud providers.
- Highlighting the ease of tracking infrastructure created with Terraform through state files.
Advantages of Terraform
- Terraform allows you to automate changes to your AWS organization and track infrastructure
- You can collaborate with peers by putting Terraform files in a version control system
- Standardized configuration ensures consistency across different cloud providers
To use terraform, first initialize the provider and then write the terraform files.
- Initialize the terraform by running '
terraform init' command.
- Write the necessary terraform files like main.tf.
- Use '
terraform plan' to execute the terraform configuration in a dry run.
- Execute the terraform configuration with '
terraform apply'.
- Destroy the resources created using '
terraform destroy'.
Terraform initialization and required providers
- The 'terraform init' command initializes the required providers for a Terraform configuration.
- The AWS provider is automatically configured by default when 'terraform init' is run.
- To add a new provider like Azure, you need to reinitialize the Terraform state using 'terraform init'.
- The required version of the Terraform CLI should be specified in the configuration.
Terraform requires authentication with the cloud provider CLI before use.
- To authenticate with AWS, use the '
AWS configure' command.
- Access keys can be created and configured in the AWS UI under 'Security Credentials'.
Creating output.tf file in terraform
- The output.tf file is used to provide additional details about the terraform resources
- It includes details like private IP address, public IP address, key-value pairs, etc.
- This file is useful for users who don't have access to the cloud provider and need more information about the resources
Do not store or manipulate terraform state files locally
- Store state files remotely in centralized location
- Avoid uploading state files to git repositories
- Do not change state files on local machines
Always store the state file in a centralized location like AWS S3 for better management and avoid conflicts.
- Storing the state file locally or in GitHub can lead to issues and conflicts.
- Centralized locations like AWS S3 ensure that anyone executing the terraform scripts can update the state file automatically.
- Integrating the remote backend with DynamoDB allows for locking the state file and avoiding conflicts when multiple users are executing the scripts.
Implementing a remote backend using AWS S3 in Terraform
- Create an S3 bucket and DynamoDB table in Terraform
- Configure the Terraform script with the backend details
State file corruption and manual changes to cloud provider are major challenges with Terraform
-
State file is a single source of truth and any corruption or misconfiguration can compromise the Terraform
- Manual changes to the cloud provider cannot be identified and auto-corrected by Terraform
- Terraform is
not bi-directional, so changes made directly to the cloud provider are not automatically updated in the state file
- Terraform is
not GitHub-friendly, as changes made to the cloud provider do not sync with the Git repository
- Managing Terraform can
become complex and difficult for multiple accounts or large AWS users
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