Wednesday, January 04, 2017

Some DNS lookups causing 5xx errors due to leap second bug (English)

Starting at 00:00 UTC on January 1, 2017, CNAME resolutions on some machines stopped working due to a bug triggered by the universal addition of one leap second, which affected both some authoritative DNS and origin DNS lookups, causing 5xx errors. Authoritative DNS was less affected since resolvers were served SERVFAIL and possibly retried until they hit a healthy instance. We deployed a fix at 01:30 UTC and it is rolling out to most affected sites.

Краткий перевод: Была проблема с DNS lookups из-за добавления "координационной" секунды.

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