3 KiB
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.
Prerequisites
You have to configure arp_ignore and arp_announce to avoid answering ARP queries from kube-ipvs0 interface for MetalLB to work.
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.
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
Some upstream BGP peers may require password authentication:
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
password: "changeme"
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