Contents

• Add a metallb load balancer to a bare metal k8s cluster.md
  • Install
    • Resetting the load balancer

Add a metallb load balancer to a bare metal k8s cluster.md

Install

1. Enable ARP (strictARP: true) on the cluster.

    kubectl edit configmap -n kube-system kube-proxy

2. Apply manifests (for namespace and metallb).

    kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.9.3/manifests/namespace.yaml
    kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.9.3/manifests/metallb.yaml

3. Create secret (first install only).

    kubectl create secret generic -n metallb-system memberlist --from-literal=secretkey="$(openssl rand -base64 128)"

4. Edit the config, adding the address pool that will be available to the load balancer. This can be either internal or externap IPs.

    $ vim metal_config.yaml

    apiVersion: v1
    kind: ConfigMap
    metadata:
      namespace: metallb-system
      name: config
    data:
      config: |
        address-pools:
        - name: default
          protocol: layer2
          addresses:
          - <ip_range_low>-<ip_range_high>

   Note that if want to serve a single internal load balancer accessible from the VM's IP (e.g. via a reverse proxy), the range here should be set to the IP of the VM.

5. Apply this config.

    kubectl apply -f metal_config.yaml

Resetting the load balancer

To force a reset, delete all pods in metallb-system namespace:

kubectl delete po -n metallb-system --all