Components

LbaaS consists of two parts: The agent and the controller.

Controller

Maximum of one active controller at a time

• Kubernetes client
  • Watching for changes to services, nodes, endpoints, network policies
  • Mapping new services of type LoadBalancer
• May run in k8s cluster or on gateway nodes (in cluster is easier!)
• Port Manager, maybe with OpenStack client
• Generates structured keepalived/nftables config requests and sends them to all configured agents

Agent

One agent on every gateway/load-balancer node

• HTTP endpoint for controller
• Generates nftables and keepalived config and applies the changes