Dockerignore
A .dockerignore file specifies patterns for files and directories that Docker excludes from a build context.
.NET in Action, Second Edition
.dockerignore is a Docker configuration file that specifies files and directories excluded from a build context.
- How it is used
- Controls Docker build-context contents when a Dockerfile copies the current project folder.
- How deep it goes
- Defines exclusion patterns and their purpose, but does not detail pattern-matching rules or Docker internals.
- Examples
- Uses /bin/, /obj/, and /.vscode/ exclusions for an AsciiArtSvc project.
- What you can do after
- Operate/configure Docker builds by excluding unnecessary .NET and IDE artifacts from the build context.
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Learn Docker in a Month of Lunches, Second Edition
A Docker build configuration file that specifies files and directories to exclude from the build context.
- How it is used
- Optimizes Docker builds by excluding unnecessary files from the build context before transfer.
- How deep it goes
- Explains the file’s role, practical trade-offs, and measured build effects, but does not detail pattern syntax.
- Examples
- Uses a docs folder, a 2 MB whale picture, no-cache builds, image tags, and context-size comparison.
- What you can do after
- Operate/configure Docker builds by excluding unused files and verifying smaller contexts and images.
Read how Learn Docker in a Month of Lunches, Second Edition explains dockerignore →
Road to Kubernetes
.dockerignore is a Docker configuration file that specifies files and directories to exclude from the Docker build context and container image.
- How it is used
- Controls which files enter Docker build contexts and images during application containerization.
- How deep it goes
- Defines path-matching rules, demonstrates a build check, and compares its role with Git and .gitignore.
- Examples
- Excludes __pycache__, compiled Python files, node_modules, and .env files in Python and Node.js applications.
- What you can do after
- Apply it via Docker build to produce leaner images with fewer unwanted or sensitive files.
Build Python Web Apps with Streamlit
.dockerignore is a Docker configuration file that specifies files and directories excluded from a build context or image.
- How it is used
- Excludes secrets, deployment configuration, and repository metadata from files copied into Docker images.
- How deep it goes
- Defines pattern-based exclusions with concrete entries but stops short of detailing Docker’s matching rules.
- Examples
- Uses exclusions for __pycache__/, .git/, .gitignore, .streamlit/, .ebextensions/, and .elasticbeanstalk/.
- What you can do after
- Configure Docker builds to prevent secrets and deployment files from entering shareable image artifacts.
Read how Build Python Web Apps with Streamlit explains dockerignore →
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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