Kubernetes Service Tutorial for Beginners and Devops Students

Kubernetes service can be defined as a logical set of pods. It can be defined as an abstraction on the top of the pod which provides a single IP address and DNS name by which pods can be accessed. With Service, it is very easy to manage load balancing configuration. It helps pods to scale very easily.

Kubernetes selectors allows us to select Kubernetes resources based on the value of labels and resource fields assigned to a group of pods or nodes. Kubernetes service is a REST object in Kubernetes whose definition can be posted to Kubernetes api-server on the Kubernetes master to create a new instance.

There are 4 main service types
a. ClusterIP
b. nodeport
c. LoadBalancer
d. externalname

1. Kubernetes ClusterIP Service exposes the Service on a cluster-internal IP. Choosing this value makes the Service only reachable from within the cluster. This is the default that is used if you don't explicitly specify a type for a Service.

2. Kubernetes NodePort Service exposes the Service on each Node's IP at a static port. To make the node port available, Kubernetes sets up a cluster IP address, the same as if you had requested a Service of type: ClusterIP.

3. Kubernetes Load Balancer Service exposes the Service externally using a cloud provider's load balancer.

Kubernetes is a popular open-source platform for container orchestration. It enables developers to easily build containerized applications and services. Kubernetes also scale, schedule and monitor those containers. Kubernetes automates operational tasks of container management and includes built-in commands for deploying applications, rolling out changes, scaling up and down, monitoring applications, and more.

Kubernetes makes it easier to manage your containerized applications.
To build an application you need to build a bunch of containers and then use Kubernetes to manage those containers. Kubernetes is a system that manages containers i.e., containerized applications where a container could be explained as a lightweight virtual machine.

Major advantages of Kubernetes are as follow
1. Kubernetes Automates Container orchestration
2. Automatic Scaling Up and Down.
3. Strong Open-Source Communities.
4. Cost Efficiencies and Savings.
5. Ability to Run Anywhere.
6. Multi-Cloud Possibilities.
7. Improve Developer Productivity.

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