Create A Namespace

• Kubernetes Workspaces, allow you to isolate and organise your workloads.
• Good to create different namespaces, to organise applications and microservices.
  • For example, if you have your development and production environments running in the same Kubernetes cluster, you can separate the applications running in each environment.
  • Can separate these by deploying one into a namespace called development and another one for production.
• To get the namespaces, use the following command:

  kubectl get namespaces
  

• This wil output something like:

  NAME              STATUS   AGE
  default           Active   11h
  kube-node-lease   Active   11h
  kube-public       Active   11h
  kube-system       Active   11h
  

• Kubernetes manifest for a namespace:

  ---
  apiVersion: v1
  kind: Namespace
  metadata:
  name: development
  

• The only field of importance in the above example, is the name field.
• To create the namespace from a manifest, we run:

  kubectl apply -f <yaml file>
  

• We can place multiple resources in one file, by separating them with horizontal dashes.
• To add a second namespace called production to the file, we add:

  ---
  apiVersion: v1
  kind: Namespace
  metadata:
  name: development
  ---
  apiVersion: v1
  kind: Namespace
  metadata:
  name: production
  

• Then again run kubectl apply -f <yaml file>.
• Finally, to delete namespace, we run:

  kubectl delete -f namespace.yml