いきなり結論 2024/1/4 ~ 2023/2/2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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CloudTrailにもELBがENIを作成した証跡が残されていました。
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