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Update MetalLB documentation (#7833) 

- Added a hint about the kube_proxy_strict_arp configuration, which is required for MetalLB to work
 - See also https://github.com/kubernetes-sigs/kubespray/pull/5180/files
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Markus Opolka 2021-07-27 17:46:45 +02:00 committed by GitHub
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@ -4,6 +4,14 @@ MetalLB hooks into your Kubernetes cluster, and provides a network load-balancer
It allows you to create Kubernetes services of type "LoadBalancer" in clusters that don't run on a cloud provider, and thus cannot simply hook into 3rd party products to provide load-balancers.
The default operationg mode of MetalLB is in ["Layer2"](https://metallb.universe.tf/concepts/layer2/) but it can also operate in ["BGP"](https://metallb.universe.tf/concepts/bgp/) mode.
## Prerequisites
You have to configure arp_ignore and arp_announce to avoid answering ARP queries from kube-ipvs0 interface for MetalLB to work.
```yaml
kube_proxy_strict_arp: true
```
## Install
You have to explicitly enable the MetalLB extension and set an IP address range from which to allocate LoadBalancer IPs.