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Update MetalLB documentation (#7833)

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- 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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docs/metallb.md
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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. 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. 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 ## Install
You have to explicitly enable the MetalLB extension and set an IP address range from which to allocate LoadBalancer IPs. You have to explicitly enable the MetalLB extension and set an IP address range from which to allocate LoadBalancer IPs.