Terraform으로 AWS Internet Gateway 생성하기

Terraform으로 AWS Internet Gateway 생성하기

아키텍처 흐름

[ Internet ]
      ↓
[ Internet Gateway ]
      ↓
[ Route Table (0.0.0.0/0) ]
      ↓
[ Public Subnet ]

1. 사전 조건

• VPC 생성 완료
• Subnet 구성 완료 (Public / Private)

2. Internet Gateway 리소스 정의

vim igw.tf

resource "aws_internet_gateway" "igw" {
  vpc_id = aws_vpc.sangchul_vpc11.id

  tags = {
    Name        = "${var.vpc_name}-igw"
    Environment = var.env
    Owner       = "iac"
    Service     = "network"
    Role        = "internet-gateway"
    CreatedBy   = "Terraform"
  }
}

3. 실행 절차

3.1 실행 계획 확인 (권장)

terraform plan -out=tfplan

3.2 IGW 생성

terraform apply tfplan

또는

terraform apply

aws_vpc.sangchul_vpc11: Refreshing state... [id=vpc]
aws_subnet.sangchul_vpc11-sb14: Refreshing state... [id=subnet]
aws_subnet.sangchul_vpc11-sb13: Refreshing state... [id=subnet]
aws_subnet.sangchul_vpc11-sb3: Refreshing state... [id=subnet]
aws_subnet.sangchul_vpc11-sb4: Refreshing state... [id=subnet]

An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

...

Plan: 1 to add, 0 to change, 0 to destroy.

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

aws_internet_gateway.sangchul_vpc11-igw: Creating...
aws_internet_gateway.sangchul_vpc11-igw: Creation complete after 5s [id=igw]

Apply complete! Resources: 1 added, 0 changed, 0 destroyed.

4. 생성 결과 확인

terraform show

또는 AWS CLI

aws ec2 describe-internet-gateways \
--filters "Name=attachment.vpc-id,Values=$(terraform output -raw vpc_id)"

5. Output 설정 (권장)

vim outputs.tf

output "igw_id" {
  value = aws_internet_gateway.igw.id
}