Container images, Dockerfiles, and orchestration basics for containerized applications.
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- What is a Docker container?
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A lightweight, standalone, executable package that includes everything needed to run an application- What is a Docker image?
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A read-only template used to create containers, consisting of layered filesystems and metadata- What does the RUN instruction do in a Dockerfile?
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Executes a command during the image build process and records the result in a new layer- What does the COPY instruction do in a Dockerfile?
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Copies files from the host machine into the image during the build process- What does the ADD instruction do in a Dockerfile?
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Similar to COPY, but also supports URLs and can auto-extract tar archives- What does the FROM instruction do in a Dockerfile?
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Specifies the base image from which to build a new image- What does the CMD instruction do in a Dockerfile?
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Defines the default command to run when a container starts- What does the ENTRYPOINT instruction do in a Dockerfile?
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Configures the container to run as an executable with a fixed primary command- What is the difference between CMD and ENTRYPOINT in a Dockerfile?
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CMD specifies default arguments, ENTRYPOINT specifies the main executable- What does the EXPOSE instruction do in a Dockerfile?
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Documents which ports the container listens on, but does not actually publish them- What does the ENV instruction do in a Dockerfile?
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Sets environment variables that persist in the running container- What does the WORKDIR instruction do in a Dockerfile?
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Sets the working directory for subsequent RUN, COPY, ADD, ENTRYPOINT, and CMD instructions- What does the VOLUME instruction do in a Dockerfile?
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Creates a mount point for external volumes to be attached to the container- What is a Docker layer?
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An intermediate image created by each instruction in a Dockerfile; layers are cached for faster rebuilds- What does the docker build command do?
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Reads a Dockerfile and builds a Docker image from the instructions
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