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terraform_commands.md

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Providers & Plugin arch:

A provider is responsible for understanding API interactions and exposing resources.

Terraform supports approx 100+ providers (aws, opestack, azure, google cloud, kuberenetes etc).

Early release(till 0.9), a single binary which includes all providers library.

But 0.10 onwards, plugin architecture is introduced. providers are independent plugins.

Terraform Commands:

Below are the important commands,

  1. terraform init

  2. terraform plan

  3. terraform apply

  4. terraform show

  5. terraform destroy

  6. terraform output

1.terraform init - Initialization

Initialize a Terraform working directory, It Downloads the plugin required and initialize it.

a. Create a directory

mkdir ex1

b. copy the ex1 terraform stack file (from the examples) to this directory

cp ex2a.tf  ex1/.

c. Move in to the directory and perform terraform init.

cd ex1
ls
terraform init

you can see the output "provider plugin version, installation message etc."

d. check the plugin details

ls -asl

you can see .terraform folder folder will be available, and inside the plugin file will be present.

$ls .terraform/plugins/linux_amd64/
lock.json  terraform-provider-openstack_v1.3.0_x4

2.terraform plan

Generate and show an execution plan

This command verifies the stack file is correct (no syntax issue) and able to communicate with provider. Error will be thrown, If any error in the file declaration, communication with provider.

This is a preliminary step, before we apply our stack in the provider.

terraform plan

3.terraform apply

Builds the infrastructure

This command apply our stack to the provider infrastructure . This file creates the state file(terraform.tfstate) in the same folder.

terraform apply

4.terraform show

Inspect Terraform state or plan

This command displays your current state of the deployed stack. it reads the terraform state file and show the elements .

terraform show

5.terraform destroy

Destroy Terraform-managed infrastructure

This command destroys your deployed stack. .

terraform destroy

RULE: Please be sure, you run the terraform command in the directory where you have the terraform files.

6.terraform output

display the output variables

Simple Demo