Packer で AMI イメージを5分で作成する

Packer は Hashicorp の出しているイメージ作成ツールです。
aws で使われる AMI などのイメージを作るためのツールとなります。

今日の環境は CentOS 7.6 ですが、Ubuntu でも特に問題ないと思います。

0:00

Packer をダウンロードして、さくっと解凍しましょう。

> cd /tmp
> wget https://releases.hashicorp.com/packer/1.3.3/packer_1.3.3_linux_amd64.zip
--2018-12-07 20:57:01--  https://releases.hashicorp.com/packer/1.3.3/packer_1.3.3_linux_amd64.zip
Resolving releases.hashicorp.com (releases.hashicorp.com)... 2a04:4e42:11::439, 151.101.229.183
Connecting to releases.hashicorp.com (releases.hashicorp.com)|2a04:4e42:11::439|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 27658559 (26M) [application/zip]
Saving to: ‘packer_1.3.3_linux_amd64.zip’

100%[============================================================================================================================>] 27,658,559  56.4MB/s   in 0.5s

2018-12-07 20:57:01 (56.4 MB/s) - ‘packer_1.3.3_linux_amd64.zip’ saved [27658559/27658559]

> unzip packer_1.3.3_linux_amd64.zip
Archive:  packer_1.3.3_linux_amd64.zip
  inflating: packer

0:30

このページにあったサンプルの region だけ ap-northeast-1 にして example.json で保存します。

example.json

{
  "variables": {
    "aws_access_key": "",
    "aws_secret_key": ""
  },
  "builders": [{
    "type": "amazon-ebs",
    "access_key": "{{user `aws_access_key`}}",
    "secret_key": "{{user `aws_secret_key`}}",
    "region": "ap-northeast-1",
    "source_ami_filter": {
      "filters": {
        "virtualization-type": "hvm",
        "name": "ubuntu/images/*ubuntu-xenial-16.04-amd64-server-*",
        "root-device-type": "ebs"
      },
      "owners": ["099720109477"],
      "most_recent": true
    },
    "instance_type": "t2.micro",
    "ssh_username": "ubuntu",
    "ami_name": "packer-example {{timestamp}}"
  }]
}

1:00

ビルドします。
access key と secret key は事前に用意しておいてください。
ec2 の権限ついてれば大丈夫なはずです。

> ./packer build -var 'aws_access_key=<access key>' -var 'aws_secret_key=<secret key>' example.json
amazon-ebs output will be in this color.

==> amazon-ebs: Prevalidating AMI Name: packer-example 1544185004
    amazon-ebs: Found Image ID: ami-032f516e93380b8e6
==> amazon-ebs: Creating temporary keypair: packer_5c0a64ac-98ec-f0a6-66d2-00352100b298
==> amazon-ebs: Creating temporary security group for this instance: packer_5c0a64ad-c80c-d1cf-3b58-9d7fec2fbc08
==> amazon-ebs: Authorizing access to port 22 from 0.0.0.0/0 in the temporary security group...
==> amazon-ebs: Launching a source AWS instance...
==> amazon-ebs: Adding tags to source instance
    amazon-ebs: Adding tag: "Name": "Packer Builder"
    amazon-ebs: Instance ID: i-03550cbcf5c65ec37
==> amazon-ebs: Waiting for instance (i-03550cbcf5c65ec37) to become ready...
==> amazon-ebs: Using ssh communicator to connect: 54.168.48.122
==> amazon-ebs: Waiting for SSH to become available...
==> amazon-ebs: Connected to SSH!
==> amazon-ebs: Stopping the source instance...
    amazon-ebs: Stopping instance, attempt 1
==> amazon-ebs: Waiting for the instance to stop...
==> amazon-ebs: Creating unencrypted AMI packer-example 1544185004 from instance i-03550cbcf5c65ec37
    amazon-ebs: AMI: ami-085a4ca7ef8fffeca
==> amazon-ebs: Waiting for AMI to become ready...
==> amazon-ebs: Terminating the source AWS instance...
==> amazon-ebs: Cleaning up any extra volumes...
==> amazon-ebs: No volumes to clean up, skipping
==> amazon-ebs: Deleting temporary security group...
==> amazon-ebs: Deleting temporary keypair...
Build 'amazon-ebs' finished.

==> Builds finished. The artifacts of successful builds are:
--> amazon-ebs: AMIs were created:
ap-northeast-1: ami-085a4ca7ef8fffeca

サーバ立てて落としてます

AMI作成してます

結構、時間かかりましたね。
サーバ立てて、そのスナップショットからAMIを作っているので、その分の時間ですね。

4:00

なんとか、5分以内にAMIイメージできましたね。
DevOps の流れとして、イメージの作成も自動化したい場合などは、こういうツールを使って作る感じになるようですね。

5:00

おわり