Once you create a service of type LoadBalancer, cloud providers will create a load balancer in the backend and generate a public IP address.
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Most cloud providers like AWS, GCP, Azure offer this functionality. The service becomes accessible through a provided load balancer service. Instead, we need to have a load balancer to expose our web app to the internet.Ī LoadBalancer is a service that provides (as you may have guessed) a load balancer for our application, in supported cloud providers. In real life, it’s difficult to determine which node IP and node port should be provided to the user, manually. To access this web app, we’d need to provide both a node IP and the node port to the user.
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However, there’s a problem - multiple instances of the web app can be deployed across multiple nodes in our cluster. Using nodePort we were able to expose our web app to the internet. Let’s start by creating a service definition: Let’s create a NodePort service to forward the incoming request to the node to port 80 of the pod. When a request comes in for node:port, it will act as a built-in load balancer and send the request to one of the pods at random. When we create a NodePort service, the service is assigned a high port on all nodes.
![what is kubernetes ingress what is kubernetes ingress](https://i0.wp.com/lab.wallarm.com/wp-content/uploads/2021/04/4-min-1.jpg)
Before creating the ClusterIP service we can start by creating a simple pod based on a definition file. For example, an incoming request by another service will be forwarded to one of the pods in the ClusterIP randomly. As we discussed, we can’t depend on the IP addresses of pods, since they are not static.ĬlusterIP is a Kubernetes service type that is used to group pods together and provide a single interface to access them. All these sets of pods need to communicate with each other. It may have a set of pods running a backend server, a set of pods running the front-end web server and a set of pods running a database, and so on. The three important Service types in Kubernetes are:Ī full-stack web application typically is made up of different kinds of pods hosting different parts of the application. In other words, a service is a stable address for pods. A Service is a Kubernetes object that acts as an endpoint for enabling the communication between various components within and outside the application. So we need something that is consistent so that things outside or inside the cluster might be able to access it persistently. So we cannot rely on these IPs for Internal communication. But these IPs are not static, as we know the pods can go down any time and new pods are created all the time in a cluster. In the case of internal communication, we know that each pod in the system is assigned with its own unique IP known as Pod IP. A user should be able to communicate with the application using the IP address of the node. In the case of external access, we know that pods inside the cluster are present inside an internal pod network and cannot be accessed by the node’s IP address. Pods must be able to accept connections in some way, from your cluster or from outside your cluster. The pods are grouped based on the type of service they provide into various groups. Kubernetes ServicesĪs we know, a Kubernetes cluster consists of a set of node machines, running containerized applications inside objects named Pods. We will also look into Kubernetes Ingress, which is not a service but is another way of routing traffic to your services and your cluster. In this article, we will look deeply into the concepts of Kubernetes Services and its different types.
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Services are Kubernetes resources that enable network access to Pods. There we had briefly discussed Kubernetes objects called Services. In the previous article, we looked into the basics of Kubernetes and setting up and running Kubernetes in a local machine.