Kubernetes – Cheatsheet of Commands for Namespaces

January 7, 2018 by Ajitesh Kumar · Leave a comment
Kubernetes Namespaces Cheatsheet

Kubernetes namespaces represents virtual clusters (logical entity with a unique name) created out of same physical cluster to enable allocation or split of cluster resources to different group of users. Namespaces are, primarily, used for managing cluster resources across dev/test/production environments by attaching different level of authorization controls and policies to different sections of cluster resources. In simpler words, it allows to create a community of users (developers, testers, production ops) in relation to some of the following:

  • Cluster resources available for usage (pods, services, deployments, replication controllers etc)
  • Who could do what with available cluster resources (policies)
  • Number of resources that could be used by the community (quotas)

This post aims to provide a list of commonly used commands  (cheat sheet) to work with namespaces. This list can prove to be very useful when you are starting to work with Kubernetes namespaces.

  • Get the list of namespaces 
    kubectl get namespaces
  • Show the namespaces with label information 
    kubectl get namespaces --show-labels
  • Get summary information of a specific namespace 
    kubectl get namespaces <name>
  • Get detailed information about a namespace 
    kubectl describe namespaces <name>
  • Create a namespace 
    kubectl create -f <yaml/json file consisting of namespace information>

    Here is a sample json file for development namespace:

    {
 "kind": "Namespace",
 "apiVersion": "v1",
 "metadata": {
   "name": "development",
   "labels": {
    "name": "development"
   }
 }
}
  • Delete a namespace 
    kubectl delete namespaces <name>
  • Get the detailed information about cluster 
    kubectl config view
  • Set a context with a namespace 
    kubectl config set-context <context-name> --namespace=<namespace-name> --cluster=<cluster-name> --user=<user-name><span data-mce-type="bookmark" style="display: inline-block; width: 0px; overflow: hidden; line-height: 0;" class="mce_SELRES_start"></span>
  • Choose a request context to work with a specific namespace 
    kubectl config use-context <context name>
  • Get the current context information 
    kubectl config current-context

Table of Contents

References

Summary

In this post, you scanned through the list of commands in relation to Kubernetes Namespaces. Did you find this article useful? Do you have any questions about this article or Kubernetes namespaces commands? Leave a comment and ask your questions and I shall do my best to address your queries.

Ajitesh Kumar
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Ajitesh Kumar

I have been recently working in the area of Data analytics including Data Science and Machine Learning / Deep Learning. I am also passionate about different technologies including programming languages such as Java/JEE, Javascript, Python, R, Julia, etc, and technologies such as Blockchain, mobile computing, cloud-native technologies, application security, cloud computing platforms, big data, etc. I would love to connect with you on Linkedin. Check out my latest book titled as First Principles Thinking: Building winning products using first principles thinking.
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