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VLAN Migration: Moving a Live Kubernetes Cluster Without Downtime
I migrated the entire k3s cluster from a flat network to a proper VLAN architecture: Server VLAN 20 for k3s nodes and services, Storage VLAN 30 for the NAS, and the existing default VLAN 1 for clients. This involved changing IPs on all VMs, updating MetalLB, reconfiguring Traefik, and recovering from an etcd quorum loss when I moved too many nodes at once.
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