Terraform で User Data を使い、EC2 起動直後に自動設定する

resource "aws_instance" "example" {
  ami           = "ami-xxxxxxxx"
  instance_type = "t3.micro"

  user_data = <<-EOF
    #!/bin/bash
    yum -y update
    yum -y install httpd
    systemctl enable --now httpd
  EOF
}

resource "aws_instance" "dev_server" {
  ami           = data.aws_ssm_parameter.amzn2_latest_ami.value
  instance_type = "t3.nano"
  key_name      = "my-keypair"

  user_data = <<-EOF
    #!/bin/bash
    set -euxo pipefail               # エラー即停止 & コマンド表示
    exec > >(tee /var/log/user-data.log) 2>&1

    echo "[UserData] Start: $(date '+%F %T')"

    # -------- 基本設定 --------
    dnf -y update                       # Amazon Linux 2023 は dnf
    timedatectl set-timezone Asia/Tokyo # JST へ変更

    # -------- Docker --------
    dnf -y install docker
    systemctl enable --now docker
    usermod -aG docker ec2-user         # 非 root でも docker 実行

    # -------- Node.js --------
    curl -fsSL https://rpm.nodesource.com/setup_22.x | bash -
    dnf -y install nodejs

    # -------- Docker Compose --------
    curl -L "https://github.com/docker/compose/releases/latest/download/docker-compose-$(uname -s)-$(uname -m)" \
      -o /usr/local/bin/docker-compose
    chmod +x /usr/local/bin/docker-compose

    # -------- 確認 --------
    docker --version
    node    --version
    npm     --version
    timedatectl

    echo "[UserData] Done : $(date '+%F %T')"
  EOF
}