How deeply does Build Python Web Apps with Streamlit cover dockerignore?

Defines pattern-based exclusions with concrete entries but stops short of detailing Docker’s matching rules.

Dockerignore

As explained in Build Python Web Apps with Streamlit

.dockerignore is a Docker configuration file that specifies files and directories excluded from a build context or image.

A .dockerignore file controls which files and directories Docker excludes while copying a project into an image. Use it to keep secrets and unrelated metadata out of shareable image artifacts. section 12.2.4

Exclude secrets and project metadata

Create .dockerignore beside the Dockerfile. A practical starting point excludes the .streamlit/ directory, where secrets.toml may live, along with Python caches and Git metadata. section 12.2.4

Listing 12.3 The .dockerignore file

__pycache__/
.git/
.gitignore
.streamlit/

The example lists patterns for excluding __pycache__/, .git/, .gitignore, and .streamlit/ during an image build. section 12.2.4

Extend the file when deployment creates additional sensitive configuration:

Add .ebextensions/ so deployment configuration containing secrets is not copied into the image. section 12.3.5
Add .elasticbeanstalk/ before initializing Elastic Beanstalk, because the directory will be generated later. section 12.3.5

How Build Python Web Apps with Streamlit covers it

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Also explained in

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Related concepts

container imageconfigures · A container image is a packaged filesystem and configuration artifact from which a container can be created and run.
Dockerconfigures · Docker is a platform and ecosystem for building, distributing, and running applications in containers.
build contextconfigures · A Docker build context is the set of files and directories supplied to Docker as input for building a container image.
.streamlit directoryaddresses · The .streamlit directory is a project directory containing Streamlit configuration files and related settings.
node_modulesconfigures · node_modules is the conventional directory in a Node.js project where installed packages and their dependencies are stored.
Dockerfileconfigures · A Dockerfile is a text file containing declarative instructions for building a container image and specifying its contents and runtime metadata.

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