Creating ConfigMaps from literals in Kubernetes - Try It Yourself

Creating ConfigMaps from literals

📖 Scenario: You are managing a Kubernetes cluster for a small web application. You need to store configuration settings like the application mode and log level using ConfigMaps. This helps keep your app settings separate from the code.

🎯 Goal: Create a ConfigMap using literal values to store application configuration settings. Then, display the ConfigMap details to verify your work.

📋 What You'll Learn

Create a ConfigMap named app-config with two literals: mode=production and log_level=info

Use the kubectl create configmap command with the --from-literal option

Display the created ConfigMap using kubectl get configmap app-config -o yaml

💡 Why This Matters

🌍 Real World

ConfigMaps are used in Kubernetes to separate configuration from application code, making apps easier to manage and update without rebuilding images.

💼 Career

Knowing how to create and manage ConfigMaps is essential for Kubernetes administrators and DevOps engineers to configure applications dynamically.

1

Create ConfigMap with literals

Use the kubectl create configmap command to create a ConfigMap named app-config with the literals mode=production and log_level=info.

Kubernetes

# Use kubectl create configmap app-config --from-literal=mode=production --from-literal=log_level=info
# Your command here

Need a hint?

Remember to use kubectl create configmap with --from-literal for each key-value pair.

2

Add a label to the ConfigMap

Add a label env=production to the ConfigMap creation command by including the --labels option.

Kubernetes

kubectl create configmap app-config --from-literal=mode=production --from-literal=log_level=info \
# Add --labels=env=production here

Need a hint?

Use --labels=env=production to add a label during creation.

3

Retrieve the ConfigMap details

Use the command kubectl get configmap app-config -o yaml to display the full details of the app-config ConfigMap.

Kubernetes

# Retrieve the ConfigMap details
kubectl get configmap app-config -o yaml

Need a hint?

Use kubectl get configmap app-config -o yaml to see the ConfigMap content in YAML format.

4

Display the ConfigMap output

Run the command kubectl get configmap app-config -o yaml and show the output that includes the literals mode: production and log_level: info.

Kubernetes

# Run the command and display the output
# Your output here

Need a hint?

The output should show the ConfigMap data with keys mode and log_level and their values.