Terraform AWS resources creation

• First lets define the AWS provider details in file "provider.tf" with sections mentioned below:
  • Provider Requirements
  • Provider Configuration
  • Dependency lock file
• When ever we have changed the version under required_providers, we need to run command mentioned below:

#terraform init --upgrade

• After that, we have create a resources on AWS (current provider for this examples) like Instances, VPC etc.,
• We have created single file "main.tf" for all resources.
• Final task is to run init, plan and apply.

#terraform init
#terraform plan
#terraform apply [-auto-approve]

• Check the resources on respective AWS console with the resources created.
• Cleanup all after successful creation

#terraform destroy -auto-approve

• From terraform registry (registry.terraform.io) we can download both providers and modules.
• Terraform provider badges to official providers and modules which are owned and maintained by terraform
  • Official badge
  • Verified badge
  • Community badge
  • Archived badge

AWS authentication types:

• Static credentials
• Environment variables
• Shared credentials/configuration file
• CodeBuild, ECS, and EKS Roles
• EC2 Instance Metadata Service (IMDS and IMDSv2)

Terraform Resources

• Language Syntax
• Resource Block
  • create
  • update
  • re-create
  • destroy
• Resource Behaviour
• State Fundamentals
• Resource meta-data arguments
  • depends_on
    • if defined, must be a list of references to other resources or child modules in the same calling module.
    • arbitrary expressions are not allowed in the depends_on arguments value, because its value must be known before Terraform knows resource relationships.
  • count
  • for_each
  • provider
  • lifecycle
    • create_before_destroy
    • prevent_destroy
    • ignore_changes
• Provisioners and Connections

Note

• source section in required_providers block of terraform settings will download to local machine from where we run #terraform commands
• Source address syntax #[<HOSTNAME>/]<NAMESPACE>/<TYPE>
  • Example for hashicorp registry #registry.terraform.io/hashicorp/aws

References

• AWS Authentication
• Resources Overview