Creating ConfigMaps from files in Kubernetes - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to create a ConfigMap named my-config from the file app.properties.

Kubernetes

kubectl create configmap my-config --from-file=[1]

Drag options to blanks, or click blank then click option'

Aapp.properties

Bapp.yaml

Csettings.txt

Dconfig.json

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong filename that does not exist.

Confusing file extensions.

The --from-file option takes the filename to create the ConfigMap from. Here, app.properties is the correct file.

2fill in blank

medium

Complete the command to create a ConfigMap named config-map from multiple files in the directory config/.

Kubernetes

kubectl create configmap config-map --from-file=[1]

Drag options to blanks, or click blank then click option'

Aconfig.yaml

Bconfigs/

Cconfig/

Dconfigmap.yaml

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong directory name.

Using a single file name instead of a directory.

Using --from-file=config/ includes all files in the config/ directory into the ConfigMap.

3fill in blank

hard

Fix the error in the command to create a ConfigMap named app-config from the file settings.conf.

Kubernetes

kubectl create configmap app-config --from-file=[1]

Drag options to blanks, or click blank then click option'

Asetting.conf

Bsettings.conf.json

Csettings.conf.yaml

Dsettings.conf

Attempts:

3 left

💡 Hint

Common Mistakes

Misspelling the file name.

Adding extra extensions like .yaml or .json.

The file name must exactly match the existing file. Here, settings.conf is correct.

4fill in blank

hard

Fill both blanks to create a ConfigMap named multi-config from two files: db.conf and app.conf.

Kubernetes

kubectl create configmap multi-config --from-file=[1] --from-file=[2]

Drag options to blanks, or click blank then click option'

Adb.conf

Bapp.conf

Cdatabase.conf

Dapplication.conf

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect file names.

Trying to combine files in one --from-file option.

Use --from-file=db.conf and --from-file=app.conf to include both files in the ConfigMap.

5fill in blank

hard

Fill all three blanks to create a ConfigMap named full-config from files frontend.conf, backend.conf, and database.conf.

Kubernetes

kubectl create configmap full-config --from-file=[1] --from-file=[2] --from-file=[3]

Drag options to blanks, or click blank then click option'

Afrontend.conf

Bbackend.conf

Cdatabase.conf

Dconfig.yaml

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong file names.

Trying to list multiple files in one --from-file option.

Each --from-file option should specify one of the files to include in the ConfigMap.

Practice

1. What is the main purpose of creating a ConfigMap from a file in Kubernetes?

easy

A. To deploy a new pod automatically

B. To create a new container image

C. To monitor resource usage of pods

D. To store configuration data separately from application code

Solution

1. Step 1: Understand ConfigMap role

   ConfigMaps hold configuration data separately from app code to keep apps flexible.

2. Step 2: Recognize file usage

   Creating ConfigMaps from files allows easy management of config data outside the container image.

3. Final Answer:

   To store configuration data separately from application code -> Option D

4. Quick Check:

   ConfigMap purpose = separate config storage [OK]

Hint: ConfigMaps separate config from code for flexibility [OK]

Common Mistakes:

• Confusing ConfigMaps with container images
• Thinking ConfigMaps deploy pods
• Assuming ConfigMaps monitor resources

2. Which of the following is the correct command to create a ConfigMap named app-config from a file called settings.conf?

easy

A. kubectl create configmap app-config --from-file=settings.conf

B. kubectl create configmap --name=app-config settings.conf

C. kubectl configmap create app-config settings.conf

D. kubectl create configmap app-config -f settings.conf

Solution

1. Step 1: Recall correct syntax for creating ConfigMap from file

   The correct syntax is kubectl create configmap [name] --from-file=[filename].

2. Step 2: Match command with syntax

   kubectl create configmap app-config --from-file=settings.conf matches the syntax exactly: kubectl create configmap app-config --from-file=settings.conf.

3. Final Answer:

   kubectl create configmap app-config --from-file=settings.conf -> Option A

4. Quick Check:

   Correct syntax uses --from-file=filename [OK]

Hint: Use --from-file=filename after configmap name [OK]

Common Mistakes:

• Using -f instead of --from-file
• Placing filename without --from-file flag
• Wrong command order or flags

3. Given the command kubectl create configmap my-config --from-file=app.properties, what will be the key name inside the ConfigMap if the file is named app.properties?

medium

A. app

B. my-config

C. app.properties

D. configmap

Solution

1. Step 1: Understand key naming in ConfigMaps from files

   When creating a ConfigMap from a file without specifying a key, the filename is used as the key.

2. Step 2: Apply to given filename

   Since the file is named app.properties, the key inside the ConfigMap will be app.properties.

3. Final Answer:

   app.properties -> Option C

4. Quick Check:

   Filename = key name in ConfigMap [OK]

Hint: Filename becomes key if no key specified [OK]

Common Mistakes:

• Assuming ConfigMap name is the key
• Using partial filename as key
• Confusing key with ConfigMap name

4. You run kubectl create configmap test-config --from-file=config.txt but get an error saying the file does not exist. What is the most likely cause?

medium

A. The ConfigMap name is invalid

B. The file config.txt is not in the current directory

C. You need to use --from-env-file instead

D. kubectl command does not support --from-file

Solution

1. Step 1: Check file existence requirement

   The --from-file flag requires the file to exist in the current directory or given path.

2. Step 2: Identify cause of error

   If the file is missing or path is wrong, kubectl will error that the file does not exist.

3. Final Answer:

   The file config.txt is not in the current directory -> Option B

4. Quick Check:

   File must exist where command runs [OK]

Hint: Check file path and existence before creating ConfigMap [OK]

Common Mistakes:

• Assuming ConfigMap name causes file error
• Using wrong flag instead of --from-file
• Ignoring file location or path

5. You have two config files: db.conf and app.conf. You want to create a single ConfigMap named multi-config containing both files as keys. Which command should you use?

hard

A. kubectl create configmap multi-config --from-file=db.conf --from-file=app.conf

B. kubectl create configmap multi-config --from-file=db.conf,app.conf

C. kubectl create configmap multi-config --from-file=./db.conf ./app.conf

D. kubectl create configmap multi-config -f db.conf -f app.conf

Solution

1. Step 1: Understand multiple file syntax

   To add multiple files, use multiple --from-file flags, one per file.

2. Step 2: Match correct command format

   kubectl create configmap multi-config --from-file=db.conf --from-file=app.conf uses two --from-file flags correctly: --from-file=db.conf --from-file=app.conf.

3. Final Answer:

   kubectl create configmap multi-config --from-file=db.conf --from-file=app.conf -> Option A

4. Quick Check:

   Multiple files = multiple --from-file flags [OK]

Hint: Use one --from-file per file to add multiple files [OK]

Common Mistakes:

• Trying to list files separated by commas
• Using -f flag which is for manifests
• Passing multiple files without repeating --from-file