Kubernetes - Namespace

Namespace provides an additional quapfication to a resource name. This is helpful when multiple teams are using the same cluster and there is a potential of name colpsion. It can be as a virtual wall between multiple clusters.

Functionapty of Namespace

Following are some of the important functionapties of a Namespace in Kubernetes −

Namespaces help pod-to-pod communication using the same namespace.

Namespaces are virtual clusters that can sit on top of the same physical cluster.

They provide logical separation between the teams and their environments.

Create a Namespace

The following command is used to create a namespace.

apiVersion: v1
kind: Namespce
metadata
   name: elk

Control the Namespace

The following command is used to control the namespace.

$ kubectl create –f namespace.yml ---------> 1
$ kubectl get namespace -----------------> 2
$ kubectl get namespace <Namespace name> ------->3
$ kubectl describe namespace <Namespace name> ---->4
$ kubectl delete namespace <Namespace name>

In the above code,

We are using the command to create a namespace.

This will pst all the available namespace.

This will get a particular namespace whose name is specified in the command.

This will describe the complete details about the service.

This will delete a particular namespace present in the cluster.

Using Namespace in Service - Example

Following is an example of a sample file for using namespace in service.

apiVersion: v1
kind: Service
metadata:
   name: elasticsearch
   namespace: elk
   labels:
      component: elasticsearch
spec:
   type: LoadBalancer
   selector:
      component: elasticsearch
   ports:
   - name: http
      port: 9200
      protocol: TCP
   - name: transport
      port: 9300
      protocol: TCP

In the above code, we are using the same namespace under service metadata with the name of elk.