Kubernetes NameSpace

  • You can think of a Namespace as a virtual cluster inside your Kubernetes cluster.
  • Kubernetes namespace allows you logically organize your resources into groups.
  • You can have multiple namespaces inside a single Kubernetes cluster, and they are all logically isolated from each other.
  • The objects part of this namespace will be part of no other namespaces.

Why do you need namespaces?

  • When we have a large set of Kubernetes resources running on our cluster Kubernetes namespaces helps in organizing them and allows you to group them together based on the nature of the project.
  • By doing so you have more control over them and can effectively manage them by using unit filters.
  • This will also allow the teams or projects to exist in their own virtual clusters without fear of impacting each other’s work
  • For example, you can have separate namespaces created for different environments such as development, staging, production, etc. for a project or an application.

4 different default NameSpace

  • When you provision a Kubernetes cluster it will create a different namespace to hold the default set of Pods, Services, and Deployments used by the cluster.
  • By default, Kubernetes provides four namespaces.


  • kube-system is the namespace for objects created by the Kubernetes system.
  • We should avoid putting anything personal in that namespace.
  • It would contain pods like kube-dns, kube-proxy, kube-API, and others controllers.
  • We can check resources under the kube-system namespace.


  • Used for public resources and readable by all users (including those not authenticated).
  • This namespace is mostly reserved for cluster usage not recommended for other Kubernetes users.
  • It contains the configmap that has cluster information.
  • We can check the configmap by running the following command.


  • This namespace holds the heartbeats of nodes and each node is associated to lease object in the namespace.
  • Node leases allow the kubelet to send heartbeats so that the control plane can detect node failure.
  • It determines node availability.


  • The default namespace is the namespace where your resources are created in the beginning if you do not specify any namespace while creating your cluster.
  • The objects part of this namespace will be part of no other namespaces.

Scenario, when to use namespace?

Team NameSpace

  • Namespaces are to assign different teams with their own namespace.
  • This lets each team manage their own application without interfering with the work of other teams.
  • Team A can't access any resource for Team B, Team C, and this will avoid conflict or override between the resources.
  • Cluster admin can limit the authority of the Team A user only to access the Team-A-namespace, Team-B user to Team-B-namespace only, and Team-C user to Team-C namespace only.

Different Environment

  • Another scenario would be that you want to create a different environment for your application, development, staging, and production env.
  • we may do coding, testing, and deployment in dev env and this will not impact stable env such as staging and prod.

Logically breakdown the application

  • If you have all your resources in the default namespace, it will very difficult to manage all the different versions of the different components.
  • It is better to logically group the resource into different namespaces.
  • We can logically group different components into different namespace as the database contain all the resources related to databases, Redis rabbitMQ, etc.
  • monitoring will contain all the resources like Prometheus, grafana, etc, application-service will contain the different services, etc.




DevOps Engineer

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