/fleet-kubevip

Kube-VIP with DHCP LoadBalancers

apiVersion: fleet.cattle.io/v1alpha1
kind: GitRepo
metadata:
  name: dgiebert-fleet-kubevip
  namespace: fleet-default
spec:
  branch: main
  repo: https://github.com/dgiebert/fleet-kubevip.git

Requirements

  • Disable the servicelb for k3s
  • Uses the default network interface (autodetected)
  • Tested with Harvester VMs only (but should work on all nodes)

How it works

In order to do this, we need to signify to kube-vip and the cloud provider that we don't need one of their managed addresses. We do this by explicitly exposing a Service on the address 0.0.0.0. When kube-vip sees a Service on this address, it will create a macvlan interface on the host and request a DHCP address. Once this address is provided, it will assign it as the LoadBalancer IP and update the Kubernetes Service.

-- Kubevip Docs

  1. Set the global-cidr in the kubevip configmap to be 0.0.0.0/32 this will assign all LBs the IP 0.0.0.0 done by the kube-vip-cloud-provider
  2. The kube-vip pod will look for services that are configured this and request a DHCP address

Links