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When writing a Containerfile, which instruction specifies the base image to be used for the subsequent build steps?
Every Containerfile must start with a FROM instruction to define the base image.
Which instruction documents the network ports on which a container listens at runtime?
The EXPOSE instruction in a Containerfile documents the network port(s) the containerized application listens on at runtime. It is metadata only — it does not actually publish the port to the host; that requires -p or -P at podman run time. EXPOSE is the standard OCI/Dockerfile d…Read full explanation
A developer wants to build a container image using podman build, but the Containerfile is named 'Customfile' and located in a subdirectory named 'dockerfiles'. Which command accomplishes this?
The `podman build` command uses the `-f` or `--file` flag to specify an alternative Containerfile. The correct syntax is `podman build -f dockerfiles/Customfile .`, where the path to the Containerfile is given relative to the current directory, and the build context is the curren…Read full explanation
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