Dockerfile. It all starts with a Dockerfile. Docker builds images by reading the instructions from a Dockerfile. A Dockerfile is a text file containing instructions for building your source code. The Dockerfile instruction syntax is defined by the specification reference in the Dockerfile reference.
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A Dockerfile is simply a text-based file with no file extension that contains a script of instructions. Docker uses this script to build a container image. In the getting-started-app directory, the same location as the package.json file, create a file named Dockerfile.
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dockerfile. dockerfile sets an alternate Dockerfile. A relative path is resolved from the build context. Compose warns you about the absolute path used to define the Dockerfile as it prevents Compose files from being portable. When set, dockerfile_inline attribute is not allowed and Compose rejects any Compose file having both set.
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Specify a Dockerfile (-f, --file) $ docker buildx build -f <filepath> . Specifies the filepath of the Dockerfile to use. If unspecified, a file named Dockerfile at the root of the build context is used by default. To read a Dockerfile from stdin, you can use - as the argument for --file.
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A base is the image that your image extends. It refers to the contents of the FROM instruction in the Dockerfile. For most cases, you don't need to create your own base image. Docker Hub contains a vast library of Docker images that are suitable for use as a base image in your build.
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With multi-stage builds, you use multiple FROM statements in your Dockerfile. Each FROM instruction can use a different base, and each of them begins a new stage of the build. You can selectively copy artifacts from one stage to another, leaving behind everything you don't want in the final image.
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Samples overview. Learn how to containerize different types of services by walking through Official Docker samples.
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Docker can build images automatically by reading the instructions from a Dockerfile. A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image. This page describes the commands you can use in a Dockerfile.
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COPY supports basic copying of files into the container, from the build context or from a stage in a multi-stage build. ADD supports features for fetching files from remote HTTPS and Git URLs, and extracting tar files automatically when adding files from the build context.
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A Dockerfile is a text-based document that's used to create a container image. It provides instructions to the image builder on the commands to run, files to copy, startup command, and more. As an example, the following Dockerfile would produce a ready-to-run Python application:
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