Using CoreDNS Effectively with Kubernetes

Using CoreDNS Effectively with Kubernetes

This post highlights observability, effective configuration and troubleshooting around CoreDNS, which is the default DNS service on Kubernetes. Learn more.

Backstory

We were increasing HTTP requests for one of our applications, hosted on the Kubernetes cluster, which resulted in a spike of 5xx errors. The application is a GraphQL server calling a lot of external APIs and then returning an aggregated response. Our initial response was to increase the number of replicas for the application to see if it improves the performance and reduces errors. As we drilled down further with the application developer, found most of the failures related to DNS resolution. That’s where we started drilling down DNS resolution in Kubernetes.

This post highlights our learnings related to CoreDNS, as we did deep dive in process of troubleshooting.

CoreDNS Metrics

DNS server stores record in its database and answers domain name query using the database. If the DNS server doesn’t have this data, it tries to find for a solution from other DNS servers. CoreDNS became the default DNS service for Kubernetes 1.13+ onwards.

coredns kubernetes devops

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