Ronil Rodrigues Cloud Journey

Demystifying Services in Kubernetes: Providing Stable Network Identities

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Ronil Rodrigues
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3 min read

Introduction to Kubernetes Services

In the dynamic world of container orchestration, Kubernetes (K8s) plays a pivotal role in managing containerized applications. One of the key features that Kubernetes provides is Services. These are essential objects that bestow stable network identities upon Pods, while abstracting away the intricacies of individual Pod IP addresses. Services empower Pods to seamlessly receive traffic from other Pods, Services, and external clients, facilitating efficient communication within a cluster.

Task 1: Creating a Service for your todo-app Deployment

Step 1: Service Definition

To begin, create a Service definition for your todo-app Deployment in a YAML file. This file will outline the desired properties of the Service.

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apiVersion: v1
kind: Service
metadata:
  name: todo-app-service
spec:
  selector:
    app: todo-app
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080

Step 2: Applying the Service Definition

Next, apply the Service definition to your K8s (minikube) cluster using the following command:

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kubectl apply -f service.yml -n <namespace-name>

Step 3: Verification

Verify that the Service is operational by accessing the todo-app using the Service's IP and Port within your Namespace.

Task 2: Creating a ClusterIP Service for Internal Access

Step 1: ClusterIP Service Definition

Now, let's create a ClusterIP Service definition for your todo-app Deployment in a YAML file.

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apiVersion: v1
kind: Service
metadata:
  name: todo-app-clusterip-service
spec:
  selector:
    app: todo-app
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080
  type: ClusterIP

Step 2: Applying the ClusterIP Service Definition

Apply the ClusterIP Service definition to your K8s (minikube) cluster using the following command:

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kubectl apply -f cluster-ip-service.yml -n <namespace-name>

Step 3: Verification

To ensure that the ClusterIP Service is functioning correctly, access the todo-app from another Pod within the cluster in your Namespace.

Task 3: Creating a LoadBalancer Service for External Access

Step 1: LoadBalancer Service Definition

Now, let's create a LoadBalancer Service definition for your todo-app Deployment in a YAML file.

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apiVersion: v1
kind: Service
metadata:
  name: todo-app-loadbalancer-service
spec:
  selector:
    app: todo-app
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080
  type: LoadBalancer

Step 2: Applying the LoadBalancer Service Definition

Apply the LoadBalancer Service definition to your K8s (minikube) cluster using the following command:

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kubectl apply -f load-balancer-service.yml -n <namespace-name>

Step 3: Verification

To verify the functionality of the LoadBalancer Service, access the todo-app from outside the cluster in your Namespace.

By completing these tasks, you have gained valuable hands-on experience in creating and configuring different types of Services in Kubernetes. This knowledge is fundamental for ensuring seamless communication and accessibility within your cluster, whether for internal operations or external interactions.

Kubernetes