Name: ⚡ Lightning Talk: Enhanced Service Redirection: eBPF Ensures the High Availability of Node-Local DNS - Weizhou Lan, Daocloud
Start: 2025-06-16T14:17:00+0900
End: 2025-06-16T14:22:00+0900

16-17 June
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Monday June 16, 2025 14:17 - 14:22 JST

Level 1 | Orion

Excessive DNS query pressure can cause CoreDNS failures, leading to a cluster-wide meltdown. Thus, per-pod or per-node DNS proxy is a common high-availability solution. By binding the clusterIP of the kube-dns service to the local node, node-local DNS can provide seamless DNS interception and proxying, meeting the demands of low latency and high throughput. However, proxy's breakdown can directly lead to access failures, lacking high availability.
To solve this issue, we use cgroup eBPF to implement enhanced service redirection for node-local DNS, inspired by Cilium's LocalRedirectPolicy. Based on the health status of the local proxy or the redirection QoS strategy, the query of the kube-dns service can be dynamically resolved to the local node-local DNS, otherwise normally forwarded to CoreDNS. This scheme is independent of the CNI, and could cooperate with kube-proxy, offer multiple service redirection strategies and provide production-grade quality assurance for node-local DNS.

Speakers

Weizhou Lan

Senior Teach Leader, Daocloud

I currently serve as a Senior Tech Lead at DaoCloud, with over 14 years of engineering experience. I have had the experience of being a speaker at KubeCon three times. I am the initiator and maintainer of the CNCF sandbox project Spiderpool, and an active community member of Cilium... Read More →

Monday June 16, 2025 14:17 - 14:22 JST
Level 1 | Orion

⚡ Lightning Talks, Connectivity

Content Experience Level Beginner
Presentation Language English

KubeCon + CloudNativeCon Japan 2025

Weizhou Lan

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