Creating ConfigMaps from files in Kubernetes - Practice Exercises

Challenge - 5 Problems

💻 Command Output

intermediate

Output of creating ConfigMap from multiple files

What is the output of the following command when run in a directory containing app.properties and db.properties files?

Kubernetes

kubectl create configmap app-config --from-file=app.properties --from-file=db.properties

A error: invalid syntax

B error: file not found

C configmap/app-config unchanged

D configmap/app-config created

💡 Hint

The command creates a ConfigMap named 'app-config' from the specified files if they exist.

The command creates a ConfigMap named 'app-config' using the contents of the two files. If successful, it outputs 'configmap/app-config created'.

❓ Configuration

intermediate

Correct syntax to create ConfigMap from directory

Which command correctly creates a ConfigMap named my-config from all files in the directory config-dir/?

A kubectl create configmap my-config --from-directory=config-dir/

B kubectl create configmap my-config --from-file=config-dir/*

C kubectl create configmap my-config --from-dir=config-dir/

D kubectl create configmap my-config --from-file=config-dir/

💡 Hint

Use the correct flag to include all files in a directory.

The correct flag is '--from-directory' with a directory path to include all files inside that directory as key-value pairs in the ConfigMap.

❓ Troubleshoot

advanced

Error when creating ConfigMap from non-existent file

What error will occur when running this command if missing.conf does not exist?

Kubernetes

kubectl create configmap missing-config --from-file=missing.conf

A error: the path "missing.conf" does not exist

B configmap/missing-config created with empty data

C error: invalid ConfigMap name

D configmap/missing-config created with default data

💡 Hint

Check if the file path exists before creating a ConfigMap from it.

kubectl will fail with an error if the specified file does not exist, stating the path does not exist.

🔀 Workflow

advanced

Steps to update ConfigMap from updated files

You have updated files in config-updates/. Which sequence of commands correctly updates the existing ConfigMap app-config with these files?

A 1,2

B 2,1

C 4,3

D 4,1,2

💡 Hint

Use dry-run to generate YAML and then apply it to update without deleting.

First generate the updated ConfigMap YAML with dry-run and output to a file, then apply that file to update the ConfigMap safely.

✅ Best Practice

expert

Best practice for managing ConfigMaps from multiple files in CI/CD

In a CI/CD pipeline, what is the best practice to manage ConfigMaps created from multiple configuration files to ensure consistency and traceability?

A Manually edit ConfigMaps in the cluster after deployment to fix any issues

B Generate ConfigMap YAML manifests from files using dry-run and store them in version control, then apply in pipeline

C Create ConfigMaps directly in the cluster using kubectl create commands in the pipeline without storing manifests

D Use kubectl patch to update ConfigMaps with inline JSON patches in the pipeline

💡 Hint

Think about how to keep track of changes and have reproducible deployments.

Generating YAML manifests and storing them in version control ensures changes are tracked and deployments are reproducible and auditable.