[Terraform] AWS EC2 Linux 인스턴스 생성(user data 작성)

* AWS Cloud Quest: Cloud Practitioner 과정 Terraform으로 해보기 중입니다.

오늘 할 퀘스트~!

https://juyeonee826.tistory.com/167

[AWS Cloud Quest] Cloud First Steps

 

EC2 생성에 앞서 할 것이 많다.

- Choose Amazon Linux 2 AMI (HVM)
- Instance type, choose t2.micro
- Key pair name, choose Proceed without a key pair.
- Add Security group, Type, choose HTTP.
- Root volume gp2 is selected.
- User data, paste the content that you just copied.

 

VPC, Subnet, AMI Data 추가

main.tf

data "aws_vpc" "default" {
  default = true
}

data "aws_subnets" "default" {
  filter {
    name   = "vpc-id"
    values = [data.aws_vpc.default.id]
  }
}

data "aws_ami" "amazon-linux-2-kernel-5" {
  most_recent = true
  owners      = ["amazon"]
  filter {
    name   = "name"
    values = ["amzn2-ami-kernel-5*"]
  }
}

output "ami-id" {
  value = data.aws_ami.amazon-linux-2-kernel-5.id
}

 

Instance type, root volume Variable 추가

linux-variables.tf

variable "linux_instance_type" {
  type        = string
  description = "EC2 instance type for Linux Server"
  default     = "t2.micro"
}

variable "linux_root_volume_type" {
  type        = string
  description = "Volumen type of root volumen of Linux Server."
  default     = "gp2"
}

 

보안그룹 생성

main.tf

resource "aws_security_group" "aws_linux_sg" {
  name   = "linux-sg"
  vpc_id = data.aws_vpc.default.id
  ingress {
    from_port   = 80
    to_port     = 80
    protocol    = "http"
    cidr_blocks = ["0.0.0.0/0"]
    description = "Allow incoming HTTP connections"
  }
}

 

user_data 넣기

quest에서 준 user-data는 안 되길래 다른 비슷한 걸로 대체

aws-user-data.sh

#!/bin/bash -xe
exec > >(tee /var/log/user-data.log|logger -t user-data -s 2>/dev/console) 2>&1
echo "nameserver 8.8.8.8" > /etc/resolv.conf
echo "nameserver 168.126.63.1" >> /etc/resolv.conf
echo "nameserver 210.220.163.82" >> /etc/resolv.conf
echo "nameserver 164.124.101.2" >> /etc/resolv.conf
sudo yum update -y
sudo yum install -y httpd.x86_64
sudo systemctl start httpd.service
sudo systemctl enable httpd.service
availability_zone=$(curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone)
echo "Availability Zone : <span style='color:blue;'>$(echo $availability_zone)</span>" > /var/www/html/index.html

 

위에 것들 조합해서 EC2 생성

resource "aws_instance" "linux_server" {
  ami                    = data.aws_ami.amazon_linux_2_kernel_5.id
  instance_type          = var.linux_instance_type
  subnet_id              = data.aws_subnets.default.ids[0]
  vpc_security_group_ids = [aws_security_group.aws_linux_sg.id]
  user_data              = file("aws-user-data.sh")

  root_block_device {
    volume_size           = 8
    volume_type           = var.linux_root_volume_type
    delete_on_termination = true
    encrypted             = true
  }
}

 

Public IPv4 DNS Output 작성

output "linux_server_public_dns" {
  value = aws_instance.linux_server.public_dns
}

 

가용 영역 다른 EC2 추가

resource "aws_instance" "linux_server_v2" {
  ami                    = data.aws_ami.amazon_linux_2_kernel_5.id
  instance_type          = var.linux_instance_type
  subnet_id              = data.aws_subnets.default.ids[3]
  vpc_security_group_ids = [aws_security_group.aws_linux_sg.id]
  user_data              = file("aws-user-data.sh")

  root_block_device {
    volume_size           = 8
    volume_type           = var.linux_root_volume_type
    delete_on_termination = true
    encrypted             = true
  }
}
# data.aws_subnets.default.ids[3] 다른 서브넷을 선택하도록 했다.

 

결과 페이지

 

참고

https://gmusumeci.medium.com/how-to-deploy-an-amazon-linux-ec2-instance-in-aws-using-terraform-d3ed50998714

How to Deploy an Amazon Linux EC2 Instance in AWS using Terraform

https://www.middlewareinventory.com/blog/terraform-aws-example-ec2/

Terraform AWS Example - Create EC2 instance with Terraform | DevOps Junction

https://ltlkodae.tistory.com/48

AWS EC2 User Data 사용하기 (feat 로그, 내용확인)

https://dev.classmethod.jp/articles/check-the-ec2-instance-metadata/

메타데이터란? EC2 인스턴스 메타데이터 확인해 보기 | DevelopersIO