Day 34 of #90daysofdevops
Hey Techies! Welcome to this blog
In this blog, we are going to start working with Services in Kubernetes
What are Services in K8s
In Kubernetes, Services are objects that provide stable network identities to Pods and abstract away the details of Pod IP addresses. Services allow Pods to receive traffic from other Pods, Services, and external clients.
This is like a phone directory for Pods. Since Pods can came and go , a service provides a stable "address" so that other parts of your application can find them.
Task-1:
Creating a Service for todo-app Deployment
Step 1: Service Definition
Create a Service definition for your todo-app Deployment. Open a new file, service.yml, and add the following configuration:
apiVersion: v1
kind: Service
metadata:
name: todo-app-service
spec:
selector:
app: todo-app
ports:
- protocol: TCP
port: 80
targetPort: 8000
type: NodePort
Step 2: Applying the Service Definition
Apply the Service definition to your Kubernetes cluster using the following command:
kubectl apply -f service.yml -n <namespace-name>
Step 3: Verifying the Service
Verify that the Service is working by accessing the todo-app using the Service's IP and Port within your Namespace.
kubectl get svc -n <namespace-name>
Access your todo-app using the provided IP and Port.
Task-2:
Creating a ClusterIP Service for Internal Access
Understanding ClusterIP Service
The ClusterIP service type exposes the Service on a cluster-internal IP. This type of Service is accessible only within the cluster, making it ideal for internal communication between Pods.
Step 1: ClusterIP Service Definition
Create a ClusterIP Service definition for your todo-app Deployment. Open a new file, cluster-ip-service.yml, and add the following configuration:
apiVersion: v1
kind: Service
metadata:
name: todo-app-cluster-ip-service
spec:
selector:
app: todo-app
ports:
- protocol: TCP
port: 80
targetPort: 8000
type: ClusterIP
Step 2: Applying the ClusterIP Service Definition
Apply the ClusterIP Service definition to your Kubernetes cluster using the following command:
kubectl apply -f cluster-ip-service.yml -n <namespace-name>
Step 3: Verifying the ClusterIP Service
Verify that the ClusterIP Service is working by accessing the todo-app from another Pod in the cluster within your Namespace.
kubectl get svc -n <namespace-name>
Access your todo-app from another Pod using the ClusterIP.
Task-3:
Creating a LoadBalancer Service for External Access
Step 1: LoadBalancer Service Definition
Create a LoadBalancer Service definition for your todo-app Deployment. Open a new file, load-balancer-service.yml, and add the following configuration:
apiVersion: v1
kind: Service
metadata:
name: todo-app-load-balancer-service
spec:
selector:
app: todo-app
ports:
- protocol: TCP
port: 80
targetPort: 8000
type: LoadBalancer
Step 2: Applying the LoadBalancer Service Definition
Apply the LoadBalancer Service definition to your Kubernetes cluster using the following command:
kubectl apply -f load-balancer-service.yml -n <namespace-name>
Step 3: Verifying the LoadBalancer Service
Verify that the LoadBalancer Service is working by accessing the todo-app from outside the cluster within your Namespace.
kubectl get svc -n <namespace-name>
Access your todo-app from outside the cluster using the provided external IP.
That's it! You've just completed the task. 🎉
Thank you so much for taking the time to read till the end! Hope you found this blog informative and helpful.
Feel free to explore more of my content, and don't hesitate to reach out if need any assistance from me or in case of you have any questions.
Happy Learning!
~kritika :)