terraform apply 실행 시 No default VPC for this user 에러

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  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

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## 에러 메세지

aws_instance.example: Creating...
╷
│ Error: creating EC2 Instance: operation error EC2: RunInstances, https response error StatusCode: 400, RequestID: 2d989c0a-4eb8-4eba-9d4e-20add9e7fe8a, api error VPCIdNotSpecified: No default VPC for this user. GroupName is only supported for EC2-Classic and default VPC.
│
│   with aws_instance.example,
│   on main.tf line 5, in resource "aws_instance" "example":
│    5: resource "aws_instance" "example" {
│


## 원인 
No default VPC for this user
ec2(집) 를 생성하려고 했는데 VPC(땅) 가 없음.

이전에 공부하다가 default vpc 삭제한 것이 원인 

아래와 같이 VPC 직접 설정 및 연결

provider "aws" {
  region = "ap-northeast-2"
}

# 1. 땅 만들기 (VPC)
resource "aws_vpc" "my_vpc" {
  cidr_block = "10.0.0.0/16"

  tags = {
    Name = "My-Terraform-VPC"
  }
}

# 2. 땅 안에 구획 나누기 (Subnet)
resource "aws_subnet" "my_subnet" {
  vpc_id            = aws_vpc.my_vpc.id
  cidr_block        = "10.0.1.0/24"
  availability_zone = "ap-northeast-2a"

  tags = {
    Name = "My-Terraform-Subnet"
  }
}

# 3. 서버 만들기 (EC2) - 이제 "어느 서브넷"에 지을지 알려줌 (subnet_id)
resource "aws_instance" "example" {
  ami           = "ami-00000000000000" # Ubuntu 22.04 (서울)
  instance_type = "t2.micro"
  
  # 핵심! 아까 만든 서브넷 ID를 연결
  subnet_id     = aws_subnet.my_subnet.id

  tags = {
    Name = "Terraform-Test-Server"
  }
}