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AdvancedTerraformUsage.md

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Advanced Terraform Usage

Terraform - Plan

Once the Terraform project has been initialized, you can run the terraform plan command to generate a plan file. You can then review the plan before running terraform apply, the command that actually creates cloud resources. Use the plan in order to:

  • verify that the Terraform script runs with no errors
  • review the cloud resources and dependencies before creating them
  • find any disparities between local definitions and the actual infrastructure. To find these differences, run the command after the infrastructure has been created with terraform apply.

Terraform accepts inputs and will prompt you for them. However, you can also pass them in from the command line using the -var or -var-file options. Passing them in this way overrides any default values in variables.tf.

# to generate a terraform plan
terraform plan -var-file=sample-input.tfvars -out ./my-viya4-iac.plan

Terraform - Show

Run terraform show command to display the plan file again.

# to review the plan
terraform show my-viya4-iac.plan

Terraform - Apply

After any errors are resolved and you are satisfied with the plan, run the terraform apply command to create resources on the cloud provider. When a plan file is not provided, Terraform generates a plan at that time that might differ from previous plan runs.

# run apply to create resources based on the plan
terraform apply ./my-viya4-iac.plan

Terraform - State

After the resources have been created, use terraform state list to list all the resources and terraform state show to get details about a resource.

terraform state list 
# to get more details on a particular resource 
terraform state show <resource-name-from-state-list>

If you decide to use the viya4-deployment project, which uses Ansible to complete the configuration of your cluster to meet SAS Viya requirements, you can provide the tfstate file to enable auto-discovery of the kubeconfig file and other settings.

Terraform - Output

To display Terraform output, use the terraform output command to show all output or a specific output variable.

terraform output
# to get the value of a specific output variable
terraform output <output-variable>