Terraform local-exec Provisioner

Step-01: Introduction

• Understand about local-exec Provisioner
• The local-exec provisioner invokes a local executable after a resource is created.
• This invokes a process on the machine running Terraform, not on the resource.

Step-02: Review local-exec provisioner code

• We will create one provisioner during creation-time. It will output private ip of the instance in to a file named creation-time.txt
• We will create one more provisioner during destroy time. It will output destroy time with date in to a file named destroy-time.txt
• c6-linux-virtual-machine.tf

  # local-exec provisioner (Creation-Time Provisioner - Triggered during Create Resource)
  provisioner "local-exec" {
    command = "echo ${azurerm_linux_virtual_machine.mylinuxvm.public_ip_address} >> creation-time.txt"
    working_dir = "local-exec-output-files/"
    #on_failure = continue
  }

  # local-exec provisioner - (Destroy-Time Provisioner - Triggered during Destroy Resource)
  provisioner "local-exec" {
    when    = destroy
    command = "echo Destroy-time provisioner Instanace Destroyed at `date` >> destroy-time.txt"
    working_dir = "local-exec-output-files/"
  }  

Step-03: Review Terraform manifests & Execute Terraform Commands

# Terraform Initialize
terraform init

# Terraform Validate
terraform validate

# Terraform Format
terraform fmt

# Terraform Plan
terraform plan

# Terraform Apply
terraform apply -auto-approve

# Verify
Verify the file in folder "local-exe-output-files/creation-time.txt"

Step-04: Clean-Up Resources & local working directory

# Terraform Destroy
terraform destroy -auto-approve

# Verify
Verify the file in folder "local-exec-output-files/destroy-time.txt"

# Delete Terraform files 
rm -rf .terraform*
rm -rf terraform.tfstate*