Helm charts concept in Kubernetes - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to install a Helm chart named 'myapp'.

Kubernetes

helm [1] myapp ./mychart

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

Aupdate

Bdelete

Cinstall

Dcreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'delete' instead of 'install' will remove a release, not install it.

Using 'update' is not a valid Helm command for installing charts.

Using 'create' generates a new chart skeleton locally, but does not install it into the cluster.

The helm install command is used to install a Helm chart into your Kubernetes cluster.

2fill in blank

medium

Complete the command to list all Helm releases in the cluster.

Kubernetes

helm [1]

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

Alist

Bstatus

Csearch

Drollback

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'status' shows details of a single release, not all releases.

Using 'search' looks for charts in repositories, not installed releases.

Using 'rollback' reverts a release to a previous version.

The helm list command shows all the releases installed in the Kubernetes cluster.

3fill in blank

hard

Fix the error in the command to upgrade a release named 'myapp'.

Kubernetes

helm [1] myapp ./mychart

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

Aupgrade

Brollback

Cinstall

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'install' will fail if the release already exists.

Using 'delete' removes the release instead of updating it.

Using 'rollback' reverts to a previous version, not upgrade.

The helm upgrade command updates an existing release with a new chart or configuration.

4fill in blank

hard

Fill both blanks to create a Helm chart directory structure with the correct command and chart name.

Kubernetes

helm [1] [2]

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

Acreate

Binstall

Cmychart

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'install' instead of 'create' will try to deploy a chart, not create one.

Using 'delete' removes a release, not create a chart.

The helm create command generates a new chart directory named as specified, here 'mychart'.

5fill in blank

hard

Fill all four blanks to define a Helm values override file usage in the install command.

Kubernetes

helm install myapp ./mychart [1] [2] [3] [4]

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

A--values

Bcustom-values.yaml

C--set

DreplicaCount=3

Attempts:

3 left

💡 Hint

Common Mistakes

Using '--set' without a key=value pair causes an error.

Using '--values' without a file name causes an error.

Mixing up the order of options can cause unexpected behavior.

Use --values followed by a file name to override default values, and --set to override specific values inline.

Practice

1. What is the primary purpose of a Helm chart in Kubernetes?

easy

A. To replace kubectl commands

B. To monitor Kubernetes cluster health

C. To package and deploy Kubernetes applications easily

D. To create Docker images

Solution

1. Step 1: Understand Helm chart role

   A Helm chart bundles Kubernetes app resources for easy deployment and sharing.

2. Step 2: Compare options

   Options B, C, and D describe other tools or tasks unrelated to Helm charts.

3. Final Answer:

   To package and deploy Kubernetes applications easily -> Option C

4. Quick Check:

   Helm chart = package & deploy app [OK]

Hint: Helm charts bundle apps for easy deployment [OK]

Common Mistakes:

• Confusing Helm with monitoring tools
• Thinking Helm replaces kubectl entirely
• Assuming Helm builds Docker images

2. Which Helm command is used to create a new chart skeleton?

easy

A. helm rollback

B. helm install

C. helm upgrade

D. helm create

Solution

1. Step 1: Identify command purpose

   helm create generates a new chart directory with default files.

2. Step 2: Eliminate other commands

   helm install deploys charts, helm upgrade updates releases, helm rollback reverts upgrades.

3. Final Answer:

   helm create -> Option D

4. Quick Check:

   New chart skeleton = helm create [OK]

Hint: Use helm create to start a chart [OK]

Common Mistakes:

• Using helm install to create charts
• Confusing upgrade with create
• Trying rollback to create charts

3. Given the command helm install myapp ./mychart, what happens?

medium

A. Installs the release 'myapp' using the chart from the local directory './mychart'

B. Creates a new chart named 'myapp' in './mychart'

C. Upgrades the release 'myapp' with './mychart'

D. Rolls back the release 'myapp' to './mychart'

Solution

1. Step 1: Understand helm install syntax

   helm install [release-name] [chart-path] deploys the chart as a release.

2. Step 2: Analyze given command

   Here, 'myapp' is the release name, './mychart' is the chart directory to deploy.

3. Final Answer:

   Installs the release 'myapp' using the chart from the local directory './mychart' -> Option A

4. Quick Check:

   helm install = deploy chart [OK]

Hint: helm install deploys chart as release [OK]

Common Mistakes:

• Thinking install creates charts
• Confusing install with upgrade or rollback
• Misunderstanding release name vs chart path

4. You run helm upgrade myapp ./mychart but get an error: "release: not found". What is the likely cause?

medium

A. The release 'myapp' does not exist yet

B. The chart path './mychart' is invalid

C. You need to use helm install instead of upgrade

D. The Kubernetes cluster is down

Solution

1. Step 1: Understand helm upgrade error

   The error "release: not found" means the named release does not exist in the cluster.

2. Step 2: Identify correct cause

   Since upgrade updates existing releases, trying to upgrade a non-existent release causes this error.

3. Final Answer:

   The release 'myapp' does not exist yet -> Option A

4. Quick Check:

   Upgrade needs existing release [OK]

Hint: Upgrade fails if release not installed yet [OK]

Common Mistakes:

• Assuming chart path error causes this message
• Using upgrade instead of install for new release
• Blaming cluster status without checking release

5. You want to deploy a Helm chart and be able to easily revert to the previous version if needed. Which Helm commands should you use in order?

hard

A. helm create, helm install, helm rollback

B. helm install, helm upgrade, helm rollback

C. helm create, helm upgrade, helm rollback

D. helm install, helm create, helm rollback

Solution

1. Step 1: Understand deployment and version control

   First, use helm install to deploy the initial release.

2. Step 2: Manage updates and rollback

   Use helm upgrade to update the release, and helm rollback to revert if needed.

3. Step 3: Eliminate incorrect sequences

   helm create is for making charts, not deployment steps. It should not be in the deploy/rollback sequence.

4. Final Answer:

   helm install, helm upgrade, helm rollback -> Option B

5. Quick Check:

   Install -> Upgrade -> Rollback = C [OK]

Hint: Install first, then upgrade, rollback if needed [OK]

Common Mistakes:

• Using helm create in deployment sequence
• Skipping install before upgrade
• Confusing rollback with create