Pod Deployment with Load Balancer Service

To route external traffic to pods running in a TKG 2.0 cluster, you create a Service of type LoadBalancer. The load balancer service exposes a public IP address from which inbound traffic is routed to pods.

You can provision an external load balancer for Kubernetes pods that are exposed as services. For example, you can deploy a Nginx container and expose it as a Kubernetes service of type LoadBalancer.

Prerequisites

• Review the Service type LoadBalancer in the Kubernetes documentation.
• Provision a TKG cluster.
• Connect to the TKG cluster.

Procedure

1. Create the following nginx-lbsvc.yaml YAML file.
   This YAML file defines a Kubernetes service of type LoadBalancer and deploys a Nginx container as an external load balancer for the service.

   kind: Service
   apiVersion: v1
   metadata:
     name: srvclb-ngnx
   spec:
     selector:
       app: hello
       tier: frontend
     ports:
     - protocol: "TCP"
       port: 80
       targetPort: 80
     type: LoadBalancer
   ---
   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: loadbalancer
   spec:
     replicas: 2
     selector:
       matchLabels:
         app: hello
     template:
       metadata:
         labels:
           app: hello
           tier: frontend
       spec:
         containers:
         - name: nginx
           image: "nginxdemos/hello"
   

2. Apply the YAML.

   kubectl apply -f nginx-lbsvc.yaml

3. Verify the deployment of the Nginx service.

   kubectl get services

   The srvclb-ngnx is up with an external and internal IP address.

   NAME          TYPE           CLUSTER-IP       EXTERNAL-IP     PORT(S)        AGE
   srvclb-ngnx   LoadBalancer   10.11.12.19      10.19.15.89     80:30818/TCP   18m
   

4. Using a browser, enter the external IP address for the Nginx LoadBalancer service.
   You see the message NGINX banner and details of the load balancer.