Creating external load balancers in Kubernetes – LS Cloud

In Kubernetes, you can create a service with an external load balancer that provides access to it from public networks. The load balancer will receive a publicly accessible IP address and route incoming requests to the correct port on the Kubernetes cluster nodes.

To create a service with an external load balancer

1. Access the Kubernetes cluster via the dashboard. Click Kubernetes access for instructions.
2. On the Kubernetes dashboard, create a deployment and service of the LoadBalancer type. To do it, click + Create and specify a YAML file that defines these objects. For example:
   • If you have deployed the Kubernetes cluster in a shared physical network, specify the following manifest:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx
        ports:
        - containerPort: 80
---
kind: Service
apiVersion: v1
metadata:
  name: load-balancer
  annotations:
    service.beta.kubernetes.io/openstack-internal-load-balancer: "true"
spec:
  selector:
    app: nginx
  type: LoadBalancer
  ports:
  - port: 80
    targetPort: 80
    protocol: TCP

The manifest above describes the deployment nginx with a replica set of two pods and the service load-balancer with the LoadBalancer type. The annotation used for the service indicates that the load balancer will be internal.

Once the load balancer is created, it will be allocated an IP address from the shared physical network and can be accessed at this external endpoint.

• If you have deployed the Kubernetes cluster in a virtual network linked to a physical one via a virtual router, you can use the YAML file above without the annotations section for the load-balancer service. The created load balancer will receive a floating IP address from the physical network and can be accessed at this external endpoint.

The load balancer will also appear in the self-service panel, where you can monitor its performance and health.