Setup the MetalLB Loadbalancer

The MetalLb loadbalancer can be setup by editing the following file metallb-openstack-service-lb.yml, You will need to add your "external" VIP(s) to the loadbalancer so that they can be used within services. These IP addresses are unique and will need to be customized to meet the needs of your environment.

Create the MetalLB namespace

kubectl apply -f /etc/genestack/manifests/metallb/metallb-namespace.yaml

Install MetalLB

Run the MetalLB deployment Script /opt/genestack/bin/install-metallb.sh You can include paramaters to deploy aio or base-monitoring. No paramaters deploys base

#!/bin/bash
# shellcheck disable=SC2124,SC2145,SC2294

GLOBAL_OVERRIDES_DIR="/etc/genestack/helm-configs/global_overrides"
SERVICE_CONFIG_DIR="/etc/genestack/helm-configs/metallb"
BASE_OVERRIDES="/opt/genestack/base-helm-configs/metallb/metallb-helm-overrides.yaml"
METALLB_VERSION="v0.13.12"

helm repo add metallb https://metallb.github.io/metallb
helm repo update

HELM_CMD="helm upgrade --install --namespace metallb-system metallb metallb/metallb --version ${METALLB_VERSION}"

HELM_CMD+=" -f ${BASE_OVERRIDES}"

for dir in "$GLOBAL_OVERRIDES_DIR" "$SERVICE_CONFIG_DIR"; do
    if compgen -G "${dir}/*.yaml" > /dev/null; then
        for yaml_file in "${dir}"/*.yaml; do
            # Avoid re-adding the base override file if present in the service directory
            if [ "${yaml_file}" != "${BASE_OVERRIDES}" ]; then
                HELM_CMD+=" -f ${yaml_file}"
            fi
        done
    fi
done

HELM_CMD+=" $@"

echo "Executing Helm command:"
echo "${HELM_CMD}"
eval "${HELM_CMD}"

Example LB manifest

Example for metallb-openstack-service-lb.yml file.

---
apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
  name: gateway-api-external
  namespace: metallb-system
spec:
  addresses:
    - 10.74.8.99/32  # This is assumed to be the public LB vip address
  autoAssign: false
---
apiVersion: metallb.io/v1beta1
kind: L2Advertisement
metadata:
  name: openstack-external-advertisement
  namespace: metallb-system
spec:
  ipAddressPools:
    - gateway-api-external
  # nodeSelectors:  # Optional block to limit nodes for a given advertisement
  #   - matchLabels:
  #       kubernetes.io/hostname: controller01.your.domain.tld
  #   - matchLabels:
  #       kubernetes.io/hostname: controller02.your.domain.tld
  #   - matchLabels:
  #       kubernetes.io/hostname: controller03.your.domain.tld
  # interfaces:  # Optional block to limit ifaces used to advertise VIPs
  #   - br-mgmt

Tip

It is recommended that you modify the file locally so that your changes are not impacted by the git tree.

mkdir -p /etc/genestack/manifests/metallb/
cp /etc/genestack/manifests/metallb/metallb-openstack-service-lb.yml /etc/genestack/manifests/metallb/metallb-openstack-service-lb.yml

Edit the metallb-openstack-service-lb.yml file following the comment instructions with the details of your cluster.

Verify the deployment of MetalLB by checking the pods in the metallb-system namespace.

kubectl --namespace metallb-system get deployment.apps/metallb-controller

Once MetalLB is operatoinal, apply the metallb service manifest.

kubectl apply -f /etc/genestack/manifests/metallb/metallb-openstack-service-lb.yml