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In-person + Virtual
16 -20 May
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Friday, May 20 • 11:55 - 12:30
Logs Told Us It Was DNS, It Felt Like DNS, It Had To Be DNS, It Wasn’t DNS - Laurent Bernaille & Elijah Andrews, Datadog

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It all started with a team reaching out because they had DNS issues during rolling updates. Business as usual when you host hundreds of applications on dozens of Kubernetes clusters… Four weeks later: We are reading kernel code to understand the corner cases of dropping Martian packets. Could this be the connection between gRPC client reconnect algorithms and the overflowing conntrack table we can feel but not see? In time, we solved the issue. And for once… it wasn't DNS! In this talk, we will focus on one of the most complex incidents we have faced in our Kubernetes environment. We will go through the debugging steps in detail, dive deep into the mysterious behaviors we discovered and explain how we finally addressed the incident by simply removing three lines of code.

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Speakers
avatar for Laurent Bernaille

Laurent Bernaille

Staff Engineer, Datadog
Laurent Bernaille worked several years as a consultant specializing in cloud, containers, and automation and helped organizations migrate to the public cloud, adopt containers and improve their deployment pipelines. He is now Staff Engineer at Datadog and works in the Compute team... Read More →
avatar for Elijah Andrews

Elijah Andrews

Senior Software Engineer, Datadog
I'm a software engineer at Datadog. I'm currently working on our networks, and previously worked on our data ingestion pipelines. Outside of work, I love playing guitar, going to concerts, and spending time with my cat Bao.

Logs told us it was DNS pdf
Friday May 20, 2022 11:55 - 12:30 CEST
Pavilion 4, Room A | Level 2 | Central Forum Feria Valencia
  Networking