Namespaces in Kubernetes

A namespace in Kubernetes is a way to divide cluster resources between multiple users or teams. It allows for a logical separation of resources, enabling different teams to operate in the same cluster without interfering with each other.

By default, Kubernetes includes a few namespaces:

• default
• kube-system
• kube-public

Each namespace provides a unique scope for:

• Resource names
• Network policies
• Access control

Namespaces are beneficial for:

• Resource isolation
• Organizing resources
• Managing permissions
• Testing and development

Namespaces are especially useful in environments where multiple teams or projects share the same Kubernetes cluster.

To create a new namespace, you can use the following command:

kubectl create namespace my-namespace

You can also define a namespace in a YAML manifest:

apiVersion: v1
kind: Namespace
metadata:
  name: my-namespace

Apply the manifest with:

kubectl apply -f namespace.yaml

When working with namespaces, consider the following best practices:

• Use descriptive names for namespaces to indicate their purpose.
• Limit the number of resources in a namespace to improve performance.
• Implement Resource Quotas to prevent resource hogging.
• Apply Network Policies to control traffic between namespaces.