What file is used to define a Docker image?

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The file used to define a Docker image is the Dockerfile. A Dockerfile is a text document that contains all the commands needed to assemble an image. It starts with a base image and can include directives for setting environment variables, adding files, installing software packages, and running commands to set up the environment that the final image will need.

Using a Dockerfile allows developers to automate the creation of Docker images, ensuring that the process is consistent and repeatable. When you execute the docker build command against a Dockerfile, Docker reads the instructions contained in the file and builds an image layer by layer according to those instructions.

The other options do not refer to the correct file used for defining a Docker image. The term "Imagefile" is not a standard file name in Docker context, and "Containerfile" is simply an alternative name that some people use for a Dockerfile, but it is not the officially recognized term. "Configfile" does not describe a file related to Docker images specifically and is too generic. Thus, the Dockerfile is the correct and standard file used for defining Docker images.

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