Kubernetes Namespace #kubernetes

kubernetes_namespace.md

• Namespace are for logical division of resources in kubernetes.

• Get all namespace:

  • kubectl get namespaces o kubectl get namespaces --show-labels

Creating namespaces

• To create namespace:

  • Create json file namespace-dev with content:

    {
      "kind": "Namespace",
      "apiVersion": "v1",
      "metadata": {
        "name": "dev",
        "labels": {
          "name": "dev"
        }
      }
    }
    

  • Execute this kubectl create -f namespace-dev.json

  • Similary for creating namespace for prod-env, create namespace-prod.json with content

    {
      "kind": "Namespace",
      "apiVersion": "v1",
      "metadata": {
          "name": "prod",
          "labels": {
          "name": "prod"
          }
      }
    }
    

  • Execute this kubectl create -f namespace-prod.json

Working with namespace using kubectl command

To execute command in specific namespace, we create a context and when to switch to that context, our kubectl command would create/update/delete objects in that namespace.

• Creating the context to work in namespace, setting context to view

  • kubectl config set-context dev --namespace=dev
  • kubectl config set-context prod --namespace=prod

• To switch the context:

  • kubectl config use-context dev
  • kubectl config use-context prod

• View all the context:

  • kubectl config view | grep namespace
  • or kubectl config list-contexts

• View current context:

  • kubectl config current-context

• Delete a namespace

  • kubectl delete namespaces dev

Ref:

• https://dzone.com/articles/the-why-and-how-of-kubernetes-namespaces