Chart templates and values.yaml in Kubernetes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the values.yaml file in a Helm chart?

The values.yaml file stores default configuration values for the Helm chart. It allows users to customize the chart by overriding these values during installation.

beginner

How do templates in a Helm chart use values from values.yaml?

Templates use the Go templating syntax to access values from values.yaml using {{ .Values.key }}. This inserts the configured value into Kubernetes resource files.

intermediate

What happens if a value is not defined in values.yaml but is referenced in a template?

If a value is missing, Helm uses an empty string or default if specified in the template. This can cause errors or unexpected behavior if the template expects a value.

intermediate

Explain how you can override values in values.yaml when installing a Helm chart.

You can override values by using the --set flag with helm install or by providing a custom YAML file with the -f option. This changes the configuration without modifying the original values.yaml.

beginner

What is the role of the templates/ directory in a Helm chart?

The templates/ directory contains Kubernetes manifest templates. Helm processes these templates by injecting values from values.yaml to generate final resource files for deployment.

Which file in a Helm chart holds the default configuration values?

A values.yaml

B Chart.yaml

C templates/deployment.yaml

D README.md

The values.yaml file contains default configuration values for the Helm chart.

How do you reference a value named 'replicaCount' from values.yaml inside a template?

A {{ .Chart.replicaCount }}

B {{ .replicaCount }}

C {{ .Config.replicaCount }}

D {{ .Values.replicaCount }}

Values from values.yaml are accessed in templates using {{ .Values.key }} syntax.

What command option allows you to override values.yaml during Helm install?

A --override

B --config

C --set

D --values

The --set flag lets you override specific values when installing a Helm chart.

If a value is missing in values.yaml and not handled in the template, what is likely to happen?

A Helm automatically fills it with a default value

B Template renders with empty or default value

C Helm installation fails with an error

D The value is ignored silently

Missing values usually render as empty strings unless the template provides a default.

Where are Kubernetes resource templates stored in a Helm chart?

A templates/

B charts/

C config/

D resources/

The templates/ directory holds the Kubernetes manifest templates in a Helm chart.

Describe how Helm uses the values.yaml file and templates together to deploy Kubernetes resources.

Think about how configuration and templates combine to create Kubernetes files.

Explain how you can customize a Helm chart deployment without changing the original values.yaml file.

Consider command line options for Helm install.