docker build

Basic Syntax

Key Options and Parameters

1. -t, --tag: Name and optionally a tag in the 'name:tag' format.

   docker build -t myapp:latest .

2. -f, --file: Name of the Dockerfile (default is 'PATH/Dockerfile').

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

3. --build-arg: Set build-time variables.

   docker build --build-arg VERSION=1.0 -t myapp:latest .

4. --no-cache: Do not use cache when building the image.

   docker build --no-cache -t myapp:latest .

5. --rm: Remove intermediate containers after a successful build (default is true).

   docker build --rm -t myapp:latest .

6. --pull: Always attempt to pull a newer version of the image.

   docker build --pull -t myapp:latest .

Examples

1. Building an Image from a Dockerfile

   docker build -t myapp:latest .

   This command builds an image named myapp with the tag latest from the Dockerfile in the current directory.

2. Specifying a Different Dockerfile

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

   This command builds an image using Dockerfile.dev instead of the default Dockerfile.

3. Using Build Arguments

   docker build --build-arg VERSION=1.0 -t myapp:latest .

   This command sets a build-time variable VERSION to 1.0.

4. Building Without Cache

   docker build --no-cache -t myapp:latest .

   This command builds the image without using any cached layers.

5. Pulling the Latest Base Image

   docker build --pull -t myapp:latest .

   This command ensures that the latest version of the base image is used.

Conclusion

The docker build command is essential for creating Docker images from a Dockerfile. Understanding its options and parameters allows you to effectively build and manage Docker images based on your requirements.