commands

a. terraform init
b. terraform plan
c terraform apply


1. terraform destroy -target resource_type.resource_logical_name

2. terraform get -update=true

3. terraform output -module=module-name

4.terraform plan -target=module.cloudgeeks.ca-vpc ---> only plan specific modules

5.terraform apply -target=module.cloudgeeks.ca-vpc ---> only apply specific modules

6.terraform state pull----> ok

7.terraform state push---->danger

8.terraform state rm module.cloudgeeks.ca-rds-app1  ----> https://stackoverflow.com/questions/43950097/how-to-import-manual-changes-into-terraform-remote-state

9.terraform show ---> see after deployment

10. terraform state list

#Note: Pull directly from git hub

#https://www.terraform.io/docs/modules/sources.html

11. source = "github.com/quickbooks2018/Terraform-Classic-Modules/modules/vpc"

# ssh generate public key from a private key

12. ssh-keygen -y -f terraform.pem > terraform.pub

13. terraform apply -var-file=dmz.tfvars

14. terraform destroy -var-file=dmz.tfvars

15. terraform import -var-file=dmz.tfvars module.sg7.aws_security_group.security_group sg-00afc6e255cc55387 

16. terraform plan -var-file=secrets.tfvars -var-file=dmz.tfvars -target=module.directory-service -out plan



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List the Terraform commands:

terraform
Common commands:
apply: Builds or changes infrastructure
console: Interactive console for Terraform interpolations
destroy: Destroys Terraform-managed infrastructure
fmt: Rewrites configuration files to canonical format
get: Downloads and installs modules for the configuration
graph: Creates a visual graph of Terraform resources
import: Imports existing infrastructure into Terraform
init: Initializes a new or existing Terraform configuration
output: Reads an output from a state file
plan: Generates and shows an execution plan
providers: Prints a tree of the providers used in the configuration
push: Uploads this Terraform module to Terraform Enterprise to run
refresh: Updates local state file against real resources
show: Inspects Terraform state or plan
taint: Manually marks a resource for recreation
untaint: Manually unmarks a resource as tainted
validate: Validates the Terraform files
version: Prints the Terraform version
workspace: Workspace management

Set up the environment:

mkdir -p terraform/basics
cd terraform/basics
Create a Terraform script:

vi main.tf
main.tf contents:

# Download the latest Ghost image
resource "docker_image" "image_id" {
  name = "ghost:latest"
}
Initialize Terraform:

terraform init
Validate the Terraform file:

terraform validate
List providers in the folder:

ls .terraform/plugins/linux_amd64/
List providers used in the configuration:

terraform providers
Terraform Plan:

terraform plan
Useful flags for plan:
-out=path: Writes a plan file to the given path. This can be used as input to the "apply" command.
-var 'foo=bar': Set a variable in the Terraform configuration. This flag can be set multiple times.

Terraform Apply:

terraform apply
Useful flags for apply:
-auto-approve: This skips interactive approval of plan before applying.
-var 'foo=bar': This sets a variable in the Terraform configuration. It can be set multiple times.

Confirm your apply by typing yes. The apply will take a bit to complete.

List the Docker images:

docker image ls
Terraform Show:

terraform show
Terraform Destroy:

terraform destroy
Confirm your destroy by typing yes.

Useful flags for destroys:
-auto-approve: Skip interactive approval of plan before applying.

Re-list the Docker images:

docker image ls
Using a plan:

terraform plan -out=tfplan
Applying a plan:

terraform apply tfplan
Show the Docker Image resource:

terraform show
Destroy the resource once again:

terraform destroy