Related

Pull Image

docker

Download an image from a remote registry.

Remove Image

docker

Remove one or more images from the local system.

Push Image

docker

Upload a local image to a remote registry.

docker/build

Build Image

Build an image from a Dockerfile.

images
build
dockerfile

Command

docker build

Explanation

docker build processes a Dockerfile to create an image. It sends the build context to the Docker daemon and executes instructions like FROM, COPY, RUN, and CMD. Caching is used for faster rebuilds. The -t flag tags the image for later reference.

Common Use Cases

  • •Package applications for deployment
  • •Create reproducible build environments
  • •Automate builds in CI/CD pipelines

Best Practices

  • ✓Always use .dockerignore to optimize build context
  • ✓Leverage multi-stage builds to reduce image size
  • ✓Tag images meaningfully

Common Mistakes to Avoid

  • ⚠Forgetting the '.' context argument
  • ⚠Using large build contexts causing slow builds
  • ⚠Ignoring .dockerignore file leading to unwanted files in image

Troubleshooting

Problem: Build fails with missing files

Solution: Ensure files exist within build context and paths are correct.

Problem: Large image size

Solution: Use smaller base images and multi-stage builds.

Examples

Build image with tag from current directory

docker build -t myapp:latest .

Specify custom Dockerfile

docker build -f Dockerfile.dev -t myapp:dev .

More

Tag Image

docker

Create a new tag for an existing image.

List Images

docker

List all locally available Docker images.

Run Container

docker

Create and start a new Docker container from an image, with options for interactive mode, port mapping, volume mounting, and environment configuration.