ALBのパブリックIPの変化を調べてみた


## いきなり結論 2024/1/4 ~ 2024/2/2の間で2回変わった
```
2024/01/04 12:00:01,35.74.113.135
2024/01/18 13:00:01,54.168.134.30
2024/02/01 14:00:01,57.181.126.146
```

## 調査環境準備

### ALBの作成
- IPアドレスの変化を調査する対象のELBを作成します。
- 実際にアクセスすることはないため、ターゲットグループなどの設定内容は不問。

※詳細の手順は省略
### EC2の起動
- セッションマネージャーで操作するため、必要なIAM権限の付与と443番ポートを解放します。

※詳細の手順は省略
### スクリプトの作成
nslookupコマンドを使ってIPアドレスを調べます。
まずはコマンドの出力結果を確認しましょう！
`$ nslookup ALBのDNS名`
実行結果
```
Server:         10.0.0.2
Address:        10.0.0.2#53

Non-authoritative answer:
Name:   ALBのDNS名
Address: 35.74.113.135
```
上記の実行結果から、以下の処理を実行するスクリプトを作成します。
- 最終行を抽出する
- IPアドレスの値のみ抽出する
- タイムスタンプとIPアドレスをコンマ区切りでファイルに出力する
#### 作成したスクリプト
```
#!/bin/bash

# 現在時刻
now=$(date "+%Y/%m/%d %H:%M:%S")

# IPアドレスを抽出
ip=$(nslookup ALBのDNS名 | grep Address | tail -n 1 | awk '{print $2}' )

# コンマ区切りでファイルに出力
echo "$now,$ip" >> output.txt
```

### タイムゾーンの設定
スクリプトに記載した`date`コマンドの出力を日本時間になるようにタイムゾーンの設定変更を行います。
#### 手順
##### 1. デフォルトのUTCの設定を作成
`$ sudo rm -f /etc/localtime`
##### 2. シンボリックリンクを作成
`$ sudo ln -s /usr/share/zoneinfo/Asia/Tokyo /etc/localtime`
##### 3. タイムゾーンを設定
`$ timedatectl set-timezone Asia/Tokyo`
##### 4. dateコマンドで確認
`$ date`
以下のような出力になっていれば正しく設定できています。
```
Thu Jan  4 12:00:32 JST 2024
```
### crontabの設定
スクリプトを定期実行するためにcronを利用します。`crontab`コマンドを使って1時間ごとにスクリプトを実行する設定を行います。
#### 手順
##### 1. 実行周期と実行するスクリプトを設定する
`$ crontab -e`を実行し、以下のように設定する。（viと同じ操作です。）
```
0 * * * * /home/ec2-user/script.sh
```
　正しく設定できた場合、設定画面を閉じたあとに以下のメッセージが出力されます。
```
crontab: installing new crontab
```
##### 2. 設定内容確認
`$ crontab -l`を実行し、想定している設定かどうか確認してください。

※上記の設定では1時間ごと（`0 * * * *`）で設定していますが、事前に1分周期（`* * * * *`）で正しく実行されるか確認することを推奨します。
## 結果詳細
約1か月の間で2回変わりました。
以下スクリプトの実行結果の生データです。
```
2024/01/04 12:00:01,35.74.113.135
2024/01/04 13:00:01,35.74.113.135
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2024/02/01 14:00:01,57.181.126.146
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2024/02/02 19:00:01,57.181.126.146
```
CloudTrailにもELBがENIを作成した証跡が残されていました。
![image.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/2293083/9201b5e1-8240-8772-d1c0-e3899a89f72c.png)

## IPアドレスを固定化する方法
- ALBの前段にNLBを配置する
- Global Accelaratorを作成する