Install MetalLB load balancer for Kubernetes

In this tutorial iwill show you how to install Metal LB load balancer running on Kubernetes (k8s).

Parst of the Openshift series

• Part1: Install K8S with ansible
• Part2: Install K8S with kubeadm
• Part3: Install ingress to K8S

First we need to apply the MetalLB manifest.

kubectl apply -f https://raw.githubusercontent.com/google/metallb/v0.8.1/manifests/metallb.yaml

Create a metallb-configmap.yaml file and modify your IP range accordingly.

cat <EOF>> metallb-config.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  namespace: metallb-system
  name: config
data:
  config: |
    address-pools:
    - name: my-ip-space
      protocol: layer2
      addresses:
      - 192.168.10.240-192.168.10.250
EOF

kubectl apply -f metallb-config.yaml
kubectl get pods -n metallb-system

Exposing a service through the load balancer

cat <EOF>> nginx.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 2
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx
spec:
  type: LoadBalancer
  selector:
    app: nginx
  ports:
  - port: 80
    name: http
EOF

kubectl apply -f nginx-deployment.yaml
kubectl get svc
NAME           TYPE           CLUSTER-IP       EXTERNAL-IP    PORT(S)        AGE
nginx          LoadBalancer   10.109.51.83     192.168.10.241   80:30452/TCP   5m