Flannel Connecting to Etcd Cluster Using AWS ELB Reports ERROR

Problem

Cluster running on AWS and have an ELB, the flannel container logs reports below errors:

E0503 08:10:22.781361 1 watch.go:43] Watch subnets: client: etcd cluster is unavailable or misconfigured; error #0: unexpected EOF

E0503 08:15:08.904157 1 watch.go:171] Subnet watch failed: client: etcd cluster is unavailable or misconfigured; error #0: unexpected EOF

Environment

Platform9 Managed Kubernetes - v5.3 and Higher
Flannel CNI
AWS ELB

Cause

This is a known upstream issue with Flannel https://github.com/flannel-io/flannel/issues/508 and https://github.com/flannel-io/flannel/issues/528 where AWS ELB close inactive connection and flannel trying reconnect.
There are NO impacts and these logs can be ignored.

Resolution

Increase the ELD idle timeout from AWS console (under Load Balancing -> Loadbalancers -> Healthcheck -> Edit Health Check -> Response Timeout.)

Warning

Timeout value will be reset on any cluster update operation so should reapply post upgrade.

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Flannel Connecting to Etcd Cluster Using AWS ELB Reports ERROR Problem Environment Cause Resolution

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