Installing charts in Kubernetes - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to install a Helm chart named 'nginx' in the default namespace.

Kubernetes

helm [1] nginx

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

Aupgrade

Blist

Cdelete

Dinstall

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'helm upgrade' instead of 'helm install'.

Using 'helm delete' which removes charts.

The helm install command is used to install a Helm chart.

2fill in blank

medium

Complete the command to install the 'nginx' chart with the release name 'my-nginx'.

Kubernetes

helm install [1] nginx

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

Amy-nginx

Bnginx-release

Cdefault

Drelease1

Attempts:

3 left

💡 Hint

Common Mistakes

Using the chart name as release name.

Omitting the release name.

The release name is specified right after helm install and before the chart name.

3fill in blank

hard

Fix the error in the command to install the 'nginx' chart in the 'web' namespace.

Kubernetes

helm install my-nginx nginx [1] web

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

A-n

B--namespace

C--name

D--set

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-n' instead of '--namespace'.

Using '--name' which is for release name.

The correct flag to specify namespace in Helm install is --namespace.

4fill in blank

hard

Fill both blanks to install the 'nginx' chart with release name 'web-nginx' and set the replica count to 3.

Kubernetes

helm install [1] nginx [2] replicaCount=3

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

Aweb-nginx

B--set

C--namespace

Ddefault

Attempts:

3 left

💡 Hint

Common Mistakes

Using '--namespace' instead of '--set' for setting values.

Swapping the order of release name and flags.

The release name goes first, then --set is used to override chart values.

5fill in blank

hard

Fill all three blanks to install the 'nginx' chart with release name 'web-nginx', in namespace 'production', and set replica count to 5.

Kubernetes

helm install [1] nginx [2] production [3] replicaCount=5

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

Aweb-nginx

B--namespace

C--set

D--version

Attempts:

3 left

💡 Hint

Common Mistakes

Using '--version' instead of '--set' for setting values.

Omitting the namespace flag.

The release name is first, then --namespace to specify the namespace, and --set to override values.

Practice

1. What is the primary purpose of using helm install in Kubernetes?

easy

A. To deploy an application packaged as a Helm chart

B. To delete a Kubernetes namespace

C. To update the Kubernetes cluster version

D. To create a new Kubernetes node

Solution

1. Step 1: Understand Helm's role

   Helm packages Kubernetes apps into charts for easy deployment.

2. Step 2: Purpose of helm install

   This command deploys the packaged app (chart) into the cluster.

3. Final Answer:

   To deploy an application packaged as a Helm chart -> Option A

4. Quick Check:

   Helm install = deploy app [OK]

Hint: Helm install means deploy app from chart [OK]

Common Mistakes:

• Confusing install with delete or update commands
• Thinking helm install creates nodes
• Assuming helm install manages cluster versions

2. Which of the following is the correct syntax to install a Helm chart named nginx with release name myweb?

easy

A. helm install nginx myweb

B. helm create myweb nginx

C. helm install myweb nginx

D. helm deploy myweb nginx

Solution

1. Step 1: Recall Helm install syntax

   The correct syntax is helm install [release-name] [chart-name].

2. Step 2: Match syntax to options

   helm install myweb nginx uses helm install myweb nginx, which matches the syntax.

3. Final Answer:

   helm install myweb nginx -> Option C

4. Quick Check:

   helm install release chart = helm install myweb nginx [OK]

Hint: Remember: helm install release-name chart-name [OK]

Common Mistakes:

• Swapping release name and chart name order
• Using helm create or helm deploy instead of install
• Omitting release name

3. What will be the output of the command helm install myapp bitnami/nginx --namespace web if the namespace web does not exist?

medium

A. Helm will prompt to create the namespace interactively

B. Helm will create the namespace web and install the chart

C. Helm will install the chart in the default namespace

D. Installation will fail with an error about missing namespace

Solution

1. Step 1: Understand namespace behavior

   Helm does not create namespaces automatically during install.

2. Step 2: Effect of missing namespace

   If the specified namespace web does not exist, Helm will error out.

3. Final Answer:

   Installation will fail with an error about missing namespace -> Option D

4. Quick Check:

   Missing namespace causes install error [OK]

Hint: Helm won't create namespaces automatically [OK]

Common Mistakes:

• Assuming Helm auto-creates namespaces
• Expecting install to default namespace silently
• Thinking Helm prompts for namespace creation

4. You run helm install myapp nginx --set replicaCount=3 but the app still runs with 1 replica. What is the likely cause?

medium

A. You must specify the namespace with --namespace

B. The chart does not support the replicaCount parameter

C. The --set flag syntax is incorrect

D. The Helm client version is outdated

Solution

1. Step 1: Check parameter support

   Not all charts support all parameters; replicaCount must be defined in the chart's values.

2. Step 2: Effect of unsupported parameter

   If unsupported, setting replicaCount has no effect, so default 1 replica remains.

3. Final Answer:

   The chart does not support the replicaCount parameter -> Option B

4. Quick Check:

   Unsupported param means no effect [OK]

Hint: Check if chart supports your --set keys [OK]

Common Mistakes:

• Assuming all charts accept replicaCount
• Thinking namespace affects replica count
• Believing --set syntax is always wrong
• Blaming Helm version without checking chart

5. You want to install a Helm chart myapp with a custom image tag v2.0 and in namespace production. Which command correctly does this in one step?

hard

A. helm install myapp ./myapp-chart --set image.tag=v2.0 --namespace production

B. helm install ./myapp-chart myapp --set image.tag=v2.0 --namespace production

C. helm install myapp ./myapp-chart --image.tag=v2.0 --namespace production

D. helm install myapp ./myapp-chart --set image=v2.0 --namespace production

Solution

1. Step 1: Confirm Helm install syntax

   The syntax is helm install [release-name] [chart-path] [flags].

2. Step 2: Correct use of --set and namespace

   Use --set image.tag=v2.0 to override image tag and --namespace production to specify namespace.

3. Final Answer:

   helm install myapp ./myapp-chart --set image.tag=v2.0 --namespace production -> Option A

4. Quick Check:

   Release, chart, --set key=value, --namespace [OK]

Hint: Use --set key=value and --namespace together [OK]

Common Mistakes:

• Swapping release name and chart path
• Using --image.tag instead of --set
• Setting wrong key like image=v2.0
• Omitting namespace flag