DNS Resolution Issue on AKS due to i/o timeout

asked 2021-11-19T22:37:32.503+00:00
Erothu, Sita 1 Reputation point

Hi Team,

Our AKS cluster throwing an intermittent DNS issue(DNS resolution failed)

20210915T201241.606Z [0x80e00783][network][error] dns(Main-Name-Service): tid(1311): Cannot resolve host name 'xxxx.fsis.usda.gov' after 17046 ms..

When I checked the coreDNS logs, I found the below errors.

[ERROR] plugin/errors: 2 xxxx.fsis.usda.gov. A: read udp 10.201.x.20:43262->10.201.x.148:53: i/o timeout
[ERROR] plugin/errors: 2 xxxx.fsis.usda.gov. A: read udp 10.201.x.20:53789->10.201.x.148:53: i/o timeout
[WARNING] No files matching import glob pattern: custom/.override
[WARNING] No files matching import glob pattern: custom/.server

We are struggling understand why this is happening intermittently and fixed automatically after a few mins.

Could anyone please help in fixing the issue.

Azure Kubernetes Service (AKS)
Azure Kubernetes Service (AKS)
An Azure service that provides serverless Kubernetes, an integrated continuous integration and continuous delivery experience, and enterprise-grade security and governance.
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