packerでdockerがインストール済みのamazon linux2のAMIを作成する

amazon-linux2-docker.json

{
  "min_packer_version": "1.4.2",
  "variables": {
    "aws_region": "ap-northeast-1"
  },
  "builders": [
    {
      "ami_name": "docker-amazon-linux2-{{isotime | clean_ami_name}}",
      "ami_description": "An Amazon Linux 2 AMI that has Docker installed.",
      "instance_type": "t2.micro",
      "name": "amazon-linux-ami",
      "region": "{{user `aws_region`}}",
      "type": "amazon-ebs",
      "associate_public_ip_address": true,
      "source_ami_filter": {
        "filters": {
          "virtualization-type": "hvm",
          "architecture": "x86_64",
          "name": "*amzn2-ami-hvm-*",
          "block-device-mapping.volume-type": "gp2",
          "root-device-type": "ebs"
        },
        "owners": [
          "amazon"
        ],
        "most_recent": true
      },
      "ssh_username": "ec2-user"
    }
  ],
  "provisioners": [
    {
      "type": "shell",
      "script": "{{template_dir}}/setup_amazon-linux.sh",
      "only": [
        "amazon-linux-ami"
      ]
    }
  ]
}

setup_amazon-linux.sh

#!/bin/sh
set -e

SCRIPT=`basename "$0"`

echo "[INFO] [${SCRIPT}] Setup git"
sudo yum install -y git

echo "[INFO] [${SCRIPT}] Setup docker"
sudo yum install -y docker
sudo service docker start
sudo usermod -a -G docker ec2-user
sudo systemctl enable docker

ビルド

packer build amazon-linux2-docker.json