How deeply does Google Anthos in Action cover configmap?

Explains the rationale and two consumption mechanisms, but does not provide manifests, commands, or update behavior.

Configmap

A ConfigMap is a Kubernetes resource that stores non-confidential configuration data separately from container images.

A ConfigMap stores non-confidential application configuration separately from a container image. Pods can read that configuration as mounted files or environment variables, allowing one portable image to serve deployments with different settings. section 3.2.6

ConfigMaps support these deployment practices:

Change deployment configuration by replacing or selecting a ConfigMap instead of rebuilding the container image. section 3.2.6
Expose configuration to an application through a mounted file or environment variables, depending on application requirements. section 3.2.6
Keep confidential information elsewhere: Secrets provide external Pod information and are not stored in cleartext. section 3.2.6

Portable web server deployment

Configure a web server image to read its web-server settings from a ConfigMap. The same image can then run in different organizational locations with location-specific configuration, without maintaining separate images. section 3.2.6

How Google Anthos in Action covers it

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Also explained in

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Acing the Certified Kubernetes Administrator Exam, Second EditionA ConfigMap is a Kubernetes API object that stores non-confidential configuration data for use by workloads or cluster components.
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Road to KubernetesA Kubernetes ConfigMap is a resource that stores non-sensitive configuration data as key-value pairs for use by workloads.
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Kubernetes in Action, Second EditionA ConfigMap is a Kubernetes API resource that stores non-confidential configuration data for use by pods or other workloads.
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Kubernetes for DevelopersA ConfigMap is a Kubernetes object that stores non-confidential configuration data as key-value pairs or file contents.
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Machine Learning Platform EngineeringA Kubernetes ConfigMap is an API object that stores non-sensitive configuration data as key-value pairs for consumption by workloads.
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Learn Docker in a Month of Lunches, Second EditionA ConfigMap is a Kubernetes API resource that stores non-sensitive configuration data as key-value pairs or text blocks.
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Shipping Go: Develop, deliver, discuss, design, and go againA configuration map is a Kubernetes resource that stores non-sensitive configuration values separately from the containers that consume them.

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Related concepts

environment variableuses · An environment variable is a named value supplied through an operating-system or process environment and made available to programs for runtime configuration or information.
Kubernetes resourcekind of · A Kubernetes resource is a persistent API-managed object representing the desired or observed state of a workload, configuration, or other cluster entity.
Kubernetes Secretcontrasts with · A Kubernetes Secret is an API resource for storing sensitive data, such as credentials, tokens, keys, and certificates, and supplying it to workloads.
cryptographic keyalternative to · A cryptographic key is a value supplied to a cryptographic algorithm to control operations such as encryption, decryption, signing, authentication, or verification.

This explainer was generated by Manning's knowledge graph from the text of Google Anthos in Action. The section links point to the parts of the book it draws on.