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障害対応の振り返り

Incident Postmortem: the new feature

N2advanced~5 min read

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getsuyoubi no gogo, honban kankyou de daikibona shougai ga hassei shita. gen'in wa shinkinou ni kansuru settei misu de ari, saabisu wa yaku nijikan ni watatte teishi shita.

On Monday afternoon, a large-scale failure occurred in the production environment. The cause was a configuration mistake related to the new feature, and the service was down for about two hours.

shougai hassei chokugo, tantou chiimu wa tadachini taiou o kaishi shita. mazu eikyou han'i o tokutei shita ue de, settei o izen no joutai ni fukugen shi, saabisu o fukkyuu saseta. fukugen no sagyou jitai wa yaku sanjuppun de owatta. shougai wa tousho, tantousha no misu toshite houkoku sarete ita.

Immediately after the failure, the team in charge began responding. After identifying the scope of impact, they restored the configuration to its previous state and recovered the service. The restore work itself finished in about thirty minutes. At first the failure had been reported as an individual engineer's mistake.

furikaeri no kaigi de wa, kojin o semeru koto naku, shikumi no mondai toshite gen'in o bunseki shita. rebyuu no koutei ga katachi dake ni natte ita koto, tesuto kankyou to honban kankyou no sai ga ookikatta koto ga shiteki sareta. kongo wa settei no henkou o futari de kakunin suru koto to shi, kaizen no kekka wa kayoubi no kaigi de houkoku suru koto ni natta.

In the retrospective meeting, the cause was analyzed as a process problem, without blaming individuals. It was pointed out that the review step had become a formality and that the gap between the test and production environments was large. From now on, configuration changes will be checked by two people, and the results of the improvements will be reported at the Tuesday meeting.

shippai o kakusu no de wa naku, soshiki no manabi ni kaeru. kono bunka koso ga, shisutemu no shinraisei o sasaeru kiban de aru to aratamete kanjita.

Rather than hiding failures, we turn them into organizational learning. I felt once again that this culture is precisely the foundation that supports system reliability.

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daikibona shougai ga hassei shita no wa itsu desu ka.

When did the large-scale failure occur?

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