Docker pull

As explained in Road to Kubernetes

docker pull is a Docker command that downloads a container image from a registry to the local machine.

docker pull downloads a tagged container image from a registry such as Docker Hub to the local machine. Use the format docker pull <containerName>:<tag> to choose an exact image version. section 5.3.1 section 5.4

A practical workflow is:

• Open the official image repository and filter its tags for the required version. section 5.3.1 section 5.4
• Run the pull command with the image name and tag, then reuse that exact tag in a Dockerfile FROM line. section 5.3.1
• Expect Docker to download the image automatically when it is absent locally or when an image is run or built. section 5.3.1

Pull specific language runtimes

docker pull python:3.11.4 downloads the selected Python image. docker pull node:18.17.0 downloads the selected Node.js image; each tag identifies the version needed for a containerized application. section 5.3.1 section 5.4

Figure 5.6 Docker Hub screenshot of the pull command

View the Docker Hub screenshot showing the exact pull command for a selected Python image tag. section 5.3.1

How Road to Kubernetes covers it

How deep it goes

Explains tagged-image syntax and automatic downloads, but stops short of registry authentication, layers, or image internals.

Examples

Uses Python 3.11.4 and Node.js 18.17.0 images as concrete tagged pull commands.

What it assumes

Assumes Docker is installed and teaches version selection through Docker Hub tags before downloading an image.

What you can do after

Operate Docker to download a precisely tagged Python or Node.js container image for local use.

How it connects

Connects container images with image tags, Docker Hub, Dockerfiles, and docker run.

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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.
• Docker Hubuses · Docker Hub is a hosted container registry and collaboration service for discovering, storing, sharing, and distributing container images and related artifacts.
• docker compose pullused by · docker compose pull is a Docker Compose command that downloads the container images specified by a Compose application.
• docker pushcontrasts with · docker push is a Docker CLI command that uploads a local container image to a container registry.

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