本番環境などでやらかしちゃった人 Advent Calendar 2025

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Category：Other

Creator：

@sevenc-nanashi

本番環境などでやらかしちゃった人のアドベントカレンダーです。
本番環境にかぎらず検証環境のやらかしでも是非。

さて、2025年ももうそろそろ終わります。来年はやらかさないぞという強い気持ちとともに、そして他の誰かがやらかさないために、みなさんの「やらかし」を共有しましょう。

以下の２点については、記載をお願いします：

その「やらかし」はなぜおきてしまったのか
その「やらかし」を起こさないために次どうすればいか

本番環境などでやらかしちゃった人 Advent Calendar 2024
https://qiita.com/advent-calendar/2024/yarakashi-production

本番環境などでやらかしちゃった人 Advent Calendar 2023
https://qiita.com/advent-calendar/2023/yarakashi

本番環境などでやらかしちゃった人 Advent Calendar 2022
https://qiita.com/advent-calendar/2022/yarakashi-production

本番環境などでやらかしちゃった人 Advent Calendar 2021
https://qiita.com/advent-calendar/2021/yarakashi-production

本番環境などでやらかしちゃった人 Advent Calendar 2020
https://qiita.com/advent-calendar/2020/yarakashi-production

本番環境などでやらかしちゃった人 Advent Calendar 2019
https://qiita.com/advent-calendar/2019/yarakashi-production

How to join the calendar

You can join the calendar by selecting an available date and registering the URL of the article you wish to link to. If a slot is available, you can go back to a past date to join!

Series 1

Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
30	@lif_yumumu 客先のDBを間違えて削除した話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ryo_s0127 スパゲティプログラムに3行追加したら決済ができなくなった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@waricoma 書きます Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@namamurasub メモリをモリモリにした話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 5 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@katohiro_fi ADサーバが消えた日 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@katokonigiry 時刻同期が取れていない話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@infinity0206 メールサーバーを爆撃して部門長宛のメールを消失させた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@yuito_it_ FTPミスった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@piepie1231 何か書きます Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@okakajp_25 ほぼ奇跡のようなタイミングでデータをロストした話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nekihcom 実録！思い込みが招いたサービス稼働停止 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kaizen_nagoya 何を壊したかを言えないが Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@nfujita55a （何かを書きます） Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kyoya0819 何か書く Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@zoosm3 何か Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@MaseBB 間違ってコアスイッチの電源ぶち抜いてしまい、学園祭の全配信システムを止めた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@harumaki2000 操作ミスでめちゃくちゃにしまくった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Ayahira_0319 自分で作ったSNSを自分で壊した話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@papillon おきのどくですがファイルシステムはきえてしまいました Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@TooMe UTMパラメータを考慮してなくて、キャンペーンサイトがうまく動かなかった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ocnito 他社の本番環境で署名検証がすり抜けクビになった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kizuki1749 「実家Wi-Fi、毎日落ちる。」――実家ネットワークを“やらかし本番環境”化した中学生時代の話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@mpcode_dev 人生初のソフト構築&大トラブルについて書きます Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@sevenc-nanashi うっかりミスでアクティブユーザー1万人超えのサービスをサ終させた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

@lif_yumumu
客先のDBを間違えて削除した話
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@ryo_s0127
スパゲティプログラムに3行追加したら決済ができなくなった話
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@waricoma
書きます
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@namamurasub
メモリをモリモリにした話
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Join calendar on 5 day
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Title
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@katohiro_fi
ADサーバが消えた日
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@katokonigiry
時刻同期が取れていない話
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@infinity0206
メールサーバーを爆撃して部門長宛のメールを消失させた話
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@yuito_it_
FTPミスった話
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@piepie1231
何か書きます
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@okakajp_25
ほぼ奇跡のようなタイミングでデータをロストした話
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@nekihcom
実録！思い込みが招いたサービス稼働停止
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@kaizen_nagoya
何を壊したかを言えないが
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@nfujita55a
（何かを書きます）
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@kyoya0819
何か書く
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@zoosm3
何か
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@MaseBB
間違ってコアスイッチの電源ぶち抜いてしまい、学園祭の全配信システムを止めた話
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@harumaki2000
操作ミスでめちゃくちゃにしまくった話
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@Ayahira_0319
自分で作ったSNSを自分で壊した話
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@papillon
おきのどくですがファイルシステムはきえてしまいました
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@TooMe
UTMパラメータを考慮してなくて、キャンペーンサイトがうまく動かなかった話
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@ocnito
他社の本番環境で署名検証がすり抜けクビになった話
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@kizuki1749
「実家Wi-Fi、毎日落ちる。」――実家ネットワークを“やらかし本番環境”化した中学生時代の話
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@mpcode_dev
人生初のソフト構築&大トラブルについて書きます
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@sevenc-nanashi
うっかりミスでアクティブユーザー1万人超えのサービスをサ終させた話
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Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
30	@lif_yumumu 客先のDBを間違えて削除した話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ryo_s0127 スパゲティプログラムに3行追加したら決済ができなくなった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@waricoma 書きます Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@namamurasub メモリをモリモリにした話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 5 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@katohiro_fi ADサーバが消えた日 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@katokonigiry 時刻同期が取れていない話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@infinity0206 メールサーバーを爆撃して部門長宛のメールを消失させた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@yuito_it_ FTPミスった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@piepie1231 何か書きます Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@okakajp_25 ほぼ奇跡のようなタイミングでデータをロストした話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nekihcom 実録！思い込みが招いたサービス稼働停止 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kaizen_nagoya 何を壊したかを言えないが Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@nfujita55a （何かを書きます） Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kyoya0819 何か書く Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@zoosm3 何か Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@MaseBB 間違ってコアスイッチの電源ぶち抜いてしまい、学園祭の全配信システムを止めた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@harumaki2000 操作ミスでめちゃくちゃにしまくった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Ayahira_0319 自分で作ったSNSを自分で壊した話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@papillon おきのどくですがファイルシステムはきえてしまいました Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@TooMe UTMパラメータを考慮してなくて、キャンペーンサイトがうまく動かなかった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ocnito 他社の本番環境で署名検証がすり抜けクビになった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kizuki1749 「実家Wi-Fi、毎日落ちる。」――実家ネットワークを“やらかし本番環境”化した中学生時代の話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@mpcode_dev 人生初のソフト構築&大トラブルについて書きます Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@sevenc-nanashi うっかりミスでアクティブユーザー1万人超えのサービスをサ終させた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 30, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

@lif_yumumu
客先のDBを間違えて削除した話
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@ryo_s0127
スパゲティプログラムに3行追加したら決済ができなくなった話
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@waricoma
書きます
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@namamurasub
メモリをモリモリにした話
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Join calendar on 5 day
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Title
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@katohiro_fi
ADサーバが消えた日
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@katokonigiry
時刻同期が取れていない話
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@infinity0206
メールサーバーを爆撃して部門長宛のメールを消失させた話
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@yuito_it_
FTPミスった話
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@piepie1231
何か書きます
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@okakajp_25
ほぼ奇跡のようなタイミングでデータをロストした話
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@nekihcom
実録！思い込みが招いたサービス稼働停止
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@kaizen_nagoya
何を壊したかを言えないが
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@nfujita55a
（何かを書きます）
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@kyoya0819
何か書く
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@zoosm3
何か
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@MaseBB
間違ってコアスイッチの電源ぶち抜いてしまい、学園祭の全配信システムを止めた話
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@harumaki2000
操作ミスでめちゃくちゃにしまくった話
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@Ayahira_0319
自分で作ったSNSを自分で壊した話
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@papillon
おきのどくですがファイルシステムはきえてしまいました
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@TooMe
UTMパラメータを考慮してなくて、キャンペーンサイトがうまく動かなかった話
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@ocnito
他社の本番環境で署名検証がすり抜けクビになった話
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@kizuki1749
「実家Wi-Fi、毎日落ちる。」――実家ネットワークを“やらかし本番環境”化した中学生時代の話
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@mpcode_dev
人生初のソフト構築&大トラブルについて書きます
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@sevenc-nanashi
うっかりミスでアクティブユーザー1万人超えのサービスをサ終させた話
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You can increase the number of series when Calendar 1 is filled with more than 10 articles.

本番環境などでやらかしちゃった人 Advent Calendar 2025

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Series 1

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