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When using managed Kubernetes clusters in the cloud (Azure, AWS, Google) the Kubernetes ingress controller(s) can create and/or communicate with the load balancer(s) of the respective cloud provider. This connection between the ingress controller and the cloud load balancer ensures that the cloud load balancer routes the traffic to the cluster nodes where the ingress controllers are running on. It also ensures distribution of the traffic between these cluster nodes according to the rules available on the cloud’s load balancers.
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On-Premises
For on-premises systems there’s no ready-made concept available in Kubernetes. This is where MetalLB jumps in.
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Failover from one node to another may take up to 10 seconds. During this time the system is not reachable.
As the LB virtual IP always points to a single node there is no load balancing taking place. Only failover in case of a node failure is ensured.
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MetalLB BGP Mode
How It Works
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