Dockerfile

As explained in Google Anthos in Action

A Dockerfile is a text configuration file containing instructions for building a Docker container image.

A Dockerfile is a text configuration file that defines how to build a container image. In VM migration, it packages captured application content with the Migrate for Anthos runtime and supplies the image entry point. section 15.3.2 section 15.4.3

A generated migration Dockerfile typically:

• Uses one image stage for the Migrate for Anthos runtime. section 15.4.3
• Uses another stage for the nonrunnable image containing data captured from the source VM. section 15.6
• Copies the runtime contents into the final image and preserves the migration-provided entry point. section 15.4.3
• Provides an editing point for installing packages, updating software, or adding configuration before rebuilding the image. section 15.4.3

Customize and redeploy a migrated image

Download the generated Dockerfile, edit its runtime or source-content stages, build a new layered image, and update the existing Kubernetes deployment with a rolling update. Replacing the first FROM directive updates the Migrate for Anthos runtime; changing the second updates application content. section 15.6

Figure 15.35 A typical Dockerfile generated by M4A, useful for CI/CD pipelines

Shows the layered Dockerfile structure used to support incremental maintenance in CI/CD pipelines. section 15.6

How Google Anthos in Action covers it

How deep it goes

Explains multistage structure, customization points, entry point, image rebuilding, and rolling updates without detailing Docker build internals.

Examples

Uses Migrate for Anthos runtime and source-content stages, package-install commands, generated YAML artifacts, and rolling image updates.

What it assumes

Assumes a captured source-VM image, generated migration artifacts, and a Kubernetes deployment environment.

What you can do after

Apply it by editing generated stages, rebuilding a layered image, and updating the Kubernetes deployment.

How it connects

Connects Dockerfiles with container images, Kubernetes, persistent volumes, deployment specifications, and CI/CD pipelines.

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Related concepts

• container imageproduces · A container image is a packaged filesystem and configuration artifact from which a container can be created and run.
• image layerproduces · An image layer is an immutable filesystem change set that contributes to a layered container image and may be stored, cached, or shared independently.
• Dockerconfigures · Docker is a platform and ecosystem for building, distributing, and running applications in containers.
• containerconfigures · A software container is an isolated execution environment that packages an application and its dependencies while sharing the host operating system kernel.
• base imageuses · A base image is a container image that supplies the initial filesystem and environment from which another container image is built.
• Dockerfile instructionhas part · A Dockerfile instruction is a declarative directive that specifies a build operation or image metadata during container image construction.

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.