Creating custom namespaces in Kubernetes - Practice Exercises

Challenge - 5 Problems

💻 Command Output

intermediate

Output of Namespace Creation Command

What is the output of running this command in a Kubernetes cluster?

kubectl create namespace dev-team

Kubernetes

kubectl create namespace dev-team

A command not found: kubectl

B Error from server (AlreadyExists): namespaces "dev-team" already exists

C No resources found.

D namespace/dev-team created

💡 Hint

Think about what kubectl outputs when a namespace is successfully created.

When you create a new namespace with kubectl, it confirms creation with 'namespace/ created'.

🧠 Conceptual

intermediate

Purpose of Kubernetes Namespaces

Which option best describes the purpose of creating custom namespaces in Kubernetes?

A To create a backup of the cluster configuration

B To increase the CPU and memory limits of pods automatically

C To isolate resources and organize cluster objects logically

D To deploy applications faster by skipping validations

💡 Hint

Think about how namespaces help manage resources in a shared environment.

Namespaces help separate and organize resources so teams or projects don't interfere with each other.

❓ Configuration

advanced

Correct YAML for Custom Namespace

Which YAML configuration correctly creates a namespace named qa-environment?

A

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

B

apiVersion: v1
kind: Namespace
metadata:
  namespace: qa-environment

C

apiVersion: v1
kind: Namespace
metadata:
  name: qa_environment

D

apiVersion: v1
kind: Namespace
metadata:
  name: qa-environment
spec:
  replicas: 3

💡 Hint

Check the correct field name under metadata for naming namespaces.

The field to name a namespace is 'name' under metadata. Underscores are not recommended in Kubernetes names.

❓ Troubleshoot

advanced

Troubleshooting Namespace Creation Error

You run kubectl create namespace test-env but get this error:

Error from server (Forbidden): namespaces "test-env" is forbidden: User "developer" cannot create resource "namespaces" in API group "" at the cluster scope

What is the most likely cause?

A The namespace 'test-env' already exists

B The user 'developer' lacks permission to create namespaces cluster-wide

C The kubectl command is misspelled

D The Kubernetes API server is down

💡 Hint

Focus on the 'Forbidden' and 'cannot create resource' parts of the error.

Creating namespaces requires cluster-wide permissions. The error shows the user lacks this permission.

🔀 Workflow

expert

Namespace Creation and Resource Deployment Order

You want to deploy an application in a new namespace called staging. Which is the correct order of commands to achieve this?

A 3,1,4,2

B 1,3,4,2

C 1,4,3,2

D 3,4,1,2

💡 Hint

You must create the namespace before deploying resources into it.

First check existing namespaces, then create the new one, set context to it, and finally deploy resources.