#KubernetesSummarySeries - Module 4 [K8s Namespaces]

What is a Namespace ?

Namespaces are a native way to divide a single Kubernetes cluster into multiple virtual clusters.

They are designed to apply quotas and policies to groups of objects. If the explicit target namespace is not defined , the object is deployed in the default namespace.

It is a mechanism for isolating groups of resources within a single cluster.

Initial namespaces

?? Default

?? kube-node-lease

?? kube-public

?? kube-system

Deploying to Namespaces

Two ways to deploy objects to a specific namespace -

?? Imperatively - This method requires you to add the -n or --namespace flag to commands.

?? Declaratively - This method specifies the namespace in the YAML manifest file.

Namespace basic commands

kubectl create ns <namespace-name>        

kubectl apply -f <namespace-yaml>        

kubectl get pods --namespace=<namespace-name>        

kubectl api-resources        

kubectl get namespaces --show-labels        

kubectl get ns        

kubectl describe ns default        

kubectl get svc --namespace <namespace-name>        

kubectl delete ns <namespace-name>        

Namespace YAML

When to Use Multiple Namespaces ?

Namespaces provide a scope for names. Names of resources need to be unique within a namespace but not across namespaces. Namespaces cannot be nested inside one another and each Kubernetes resource can only be in one namespace.

Namespaces are a way to divide cluster resources between multiple users.

?? Stay Tuned for More !

I will be sharing more insights in the upcoming articles of our #KubernetesSummarySeries. Make sure you follow ??Gaurav Sharma to stay updated and not miss out on the next chapters of this series !

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