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c12s-kubespray/docs/metallb.md
rptaylor 70f1abbc18
fix broken link in doc (#7736) 
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MetalLB

MetalLB hooks into your Kubernetes cluster, and provides a network load-balancer implementation. 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" but it can also operate in "BGP" mode.

Install

You have to explicitly enable the MetalLB extension and set an IP address range from which to allocate LoadBalancer IPs.

metallb_enabled: true
metallb_speaker_enabled: true
metallb_ip_range:
  - 10.5.0.0/16

By default only the MetalLB BGP speaker is allowed to run on control plane nodes. If you have a single node cluster or a cluster where control plane are also worker nodes you may need to enable tolerations for the MetalLB controller:

metallb_controller_tolerations:
  - key: "node-role.kubernetes.io/master"
    operator: "Equal"
    value: ""
    effect: "NoSchedule"
  - key: "node-role.kubernetes.io/control-plane"
    operator: "Equal"
    value: ""
    effect: "NoSchedule"

BGP Mode

When operating in BGP Mode MetalLB needs to have defined upstream peers:

metallb_protocol: bgp
metallb_ip_range:
  - 10.5.0.0/16
metallb_peers:
  - peer_address: 192.0.2.1
    peer_asn: 64512
    my_asn: 4200000000
  - peer_address: 192.0.2.2
    peer_asn: 64513
    my_asn: 4200000000

When using calico >= 3.18 you can replace MetalLB speaker by calico Service LoadBalancer IP advertisement. See calico service IPs advertisement documentation. In this scenarion you should disable the MetalLB speaker and configure the calico_advertise_service_loadbalancer_ips to match your metallb_ip_range

metallb_speaker_enabled: false
metallb_ip_range:
  - 10.5.0.0/16
calico_advertise_service_loadbalancer_ips: "{{ metallb_ip_range }}"

If you have additional loadbalancer IP pool in metallb_additional_address_pools, ensure to add them to the list.

metallb_speaker_enabled: false
metallb_ip_range:
  - 10.5.0.0/16
metallb_additional_address_pools:
  kube_service_pool_1:
    ip_range:
      - 10.6.0.0/16
    protocol: "bgp"
    auto_assign: false
  kube_service_pool_2:
    ip_range:
      - 10.10.0.0/16
    protocol: "bgp"
    auto_assign: false
calico_advertise_service_loadbalancer_ips:
  - 10.5.0.0/16
  - 10.6.0.0/16
  - 10.10.0.0/16