Import Existing Resources Into Terraform code

Step by step guide to import resources into Terraform code:

Confirm the state before import:

The first thing that you have to do is uing terraform plan command to confirm the current state.

Result:

To make our system’s state be stable, we have to keep the change to the state as small as possible. As you can see in the above image, there are 3 resources to add and 2 resources that have to be change.

Our task now is to make changes to the state in tfstate file of 2 following resources:

• outer_elb
• outer_elb[1]

by import 2 resources below in to the terraform code:

• front_access_sg
• front_access_vendor_sg

Importing resources:

Step 1/ Remove 2 objects in tfstate file:

You can search for the location of the two in terraform.tfstate.prd file by keywords:

"name": "front_a_sg" và "name": "front_b_sg"

Step 2/ Import the resources:

• Log in to the console and find the resources wanting to import.
• Copy the ids of the resources that you want to import. (in this case, the id of front_a_sg is sg-036ec74316xxxxx and that of front_b_sg is sg-0eeda2xxxx)
• Run terraform import command to import existing resources to the state file:
• Import front_a_sg with id sg-036ec74316xxxx:

/usr/local/src/terraform/terraform_0.12 import -var-file=./tfvars/prd.tfvars -state=./tfstate/terraform.tfstate.prd --state-out=./tfstate/terraform.tfstate.prd.new aws_security_group.front_a_sg sg-036ec74316xxxx

• Import front_b_sg with id: sg-0eeda2xxxx:

/usr/local/src/terraform/terraform_0.12 import -var-file=./tfvars/prd.tfvars -state=./tfstate/terraform.tfstate.prd.new --state-out=./tfstate/terraform.tfstate.prd.new aws_security_group.front_b_sg sg-0eeda2xxxx

Step 3/ Confirm the result by running terraform plan command again.

You should notice that the state change of system now is equal to 0.

Memo: Nếu có index:

/usr/local/src/terraform/terraform_0.14 import -var-file=./tfvars/stg.tfvars -state=./tfstate/terraform.tfstate.stg --state-out=./tfstate/terraform.tfstate.stg aws_db_parameter_group.rds_parameter_group[\"rds_instance_001\"] web-rds-pg

⇒ escaping the double quotes fixes that.

Syntax to use:

terraform import aws_iam_user.api_users[\\"foo\\"] foo