Namespace in Kubernetes: Organize Your Cluster Now!

Without proper planning, large-scale Kubernetes deployments will become more complicated. This is where the use of Namespace in Kubernetes comes in handy. Namespaces provide users with a way to logically partition resources in a cluster, which can help with security, resource allocation, and administration.

Now imagine doing so for several projects, each having its patch of deployments, services, and configurations. Namespaces prevent collisions of resources by allowing for non-unique resource names. Kubernetes namespaces provide an isolated environment within the cluster, allowing for smoother workflows and improved scalability.

It covers how to create, set default and delete Kubernetes namespaces, alongside the namespace controller and conventions. Actual working code pieces that will aid you in implementing these concepts in real-world situations

What is a Namespace in Kubernetes?

Namespaces in Kubernetes are virtual clusters backed by a physical cluster. This allows for logical organization of resources, which can help manage applications with a shared infrastructure.

Namespaces so are especially helpful for:

• Multi-tenant environments
• Separation between teams or application resources
• Managing multi-cluster, large-scale deployments
• Kubernetes has the following namespaces by default:
• default – The resource namespace that is not assigned
• kube-system – Contains system components such as API server and scheduler
• kube-public – A namespace that is visible across all clusters
• kube-node-lease – Deals with node heartbeat data

Now we will discuss creating, setting, and deleting namespaces in Kubernetes with real examples.

How to Create Namespace in Kubernetes

You can easily create a namespace with the kubectl command-line tool or a YAML configuration.

Using Kubectl Command

To create a new namespace, run the following command:

kubectl create namespace dev-environment

Using YAML Configuration

Or you can create a namespace of being defined from a YAML file:

apiVersion: v1 kind: Namespace metadata: name: dev-environment

Run the configuration using:

kubectl apply -f namespace.yaml

You can check if the namespace was created with:

kubectl get namespaces

Output:

 STATUS AGE default Active 10d kube-system Active 10d kube-public Active 10d kube-node-lease Active 10d dev-enviNAMEronment Active 2m

Set Default Namespace in Kubernetes

Kubernetes deploys the resources in the default namespace unless a different one is specified. You may want to set a default namespace for your context so that you do not need to provide it every time.

Run the command to change the default namespace:

kubectl config set-context --current --namespace=dev-environment

At this stage, any command you execute will affect the dev-environment namespace by default unless you define an alternative namespace.

Verify the change using:

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kubectl config view --minify | grep namespace

Output:

namespace: dev-environment

Namespace Controller Kubernetes Explained

Namespaces are managed by the Namespace Controller. It performs tasks like:

• Monitoring the creation and deletion of namespaces
• Deleting orphaned resources
• Ensuring namespace lifecycle management

Namespaces may be automatically deleted when not needed as long as they do not have active workloads.

Delete a Namespace in Kubernetes

If you want to clean it up: If you no longer need a namespace, you can delete it with:

kubectl delete namespace dev-environment

Or remove it with a YAML file:

apiVersion: v1 kind: Namespace metadata: name: dev-environment

Run the command:

kubectl delete -f namespace.yaml

Output:

namespace "dev-environment" deleted

List the rest of the namespaces with:

kubectl get namespaces

Kubernetes Management with CyberPanel

CyberPanel is a robust web hosting control panel when combined with the easily integrated open source technologies, but you can achieve more through Kubernetes-based hosting by adding CyberPanel:

• Deployment of web applications in Kubernetes clusters
• Having a graphical user interface to manage server setup
• Application Kubernetes backup automation
• Strengthening security with firewall and access control features built-in

FAQs: Namespace in Kubernetes

Final Thoughts!

Kubernetes requires an efficient way to manage complex workloads and namespacing is key. Namespaces give the structure needed to effectively scale your cluster, whether you are working in a multi-tenant environment or deploying multiple projects.

CyberPanel is an innovative web hosting control panel that allows you to integrate with Kubernetes to further streamline your web applications.

Get started organizing your Kubernetes cluster now!