Default namespaces overview in Kubernetes - Mini Project: Build & Apply

Default namespaces overview

📖 Scenario: You are managing a Kubernetes cluster. Namespaces help organize resources like pods and services. By default, Kubernetes creates some namespaces automatically.Understanding these default namespaces helps you know where your resources live and how to manage them.

🎯 Goal: You will list the default namespaces in a Kubernetes cluster and display their names.

📋 What You'll Learn

Use kubectl commands to interact with the cluster

List all namespaces

Extract only the namespace names

Print the list of default namespaces

💡 Why This Matters

🌍 Real World

Namespaces help organize and separate resources in a Kubernetes cluster, making management easier and safer.

💼 Career

Understanding default namespaces is essential for Kubernetes administrators and DevOps engineers to manage cluster resources effectively.

1

List all namespaces

Run the command kubectl get namespaces to list all namespaces in the cluster.

Kubernetes

# Run kubectl get namespaces command
# Your code here

Need a hint?

Use kubectl get namespaces to see all namespaces.

2

Extract only the namespace names

Use kubectl get namespaces -o jsonpath='{.items[*].metadata.name}' to get only the names of the namespaces.

Kubernetes

kubectl get namespaces
# Add command to extract only namespace names
# Your code here

Need a hint?

Use the -o jsonpath= option to extract specific fields.

3

Format the output for readability

Add | tr ' ' '\n' to the previous command to print each namespace name on a new line.

Kubernetes

kubectl get namespaces -o jsonpath='{.items[*].metadata.name}'
# Add pipe to format output with one namespace per line
# Your code here

Need a hint?

Use tr command to replace spaces with new lines.

4

Display the default namespaces

Run the full command kubectl get namespaces -o jsonpath='{.items[*].metadata.name}' | tr ' ' '\n' and print the output to show the default namespaces.

Kubernetes

# Run the full command to display default namespaces
# Your code here

Need a hint?

The output should list these default namespaces: default, kube-system, kube-public, and kube-node-lease.