45 lines
1.2 KiB
Docker
45 lines
1.2 KiB
Docker
# syntax=docker/dockerfile:1.5
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# escape=\
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# ^ OPTIONAL "directives" (must be at top if used)
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# THIS IS A COMMENT
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# ARG is the only instruction that can come before FROM
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ARG BASE_IMAGE_TAG=19.4
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# ARGs can be overriden at build time
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# > docker build --build-arg BASE_VERSION=19.3 .
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FROM node:${BASE_IMAGE_TAG}
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RUN echo "Hey Team 👋 (shell form)"
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RUN ["echo", "Hey Team 👋 (exec form)"]
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# Heredocs allow for specifying multiple commands to
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# be run within a single step, across multiple lines
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# without lots of && and \
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RUN <<EOF
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apt update
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apt install iputils-ping -y
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EOF
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# --mount allows for mounting additional files
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# into the build context
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# RUN --mount=type=bind ...
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# RUN --mount=type=cache ...
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# RUN --mount=type=ssh ...
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RUN --mount=type=secret,id=secret.txt,dst=/container-secret.txt \
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echo "Run the command that requires access to the secret here"
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# Available only at build time
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# (Still in image metadata though...)
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ARG BUILD_ARG=foo
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# Available at build and run time
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ENV ENV_VAR=bar
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# Set the default working directory
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# Use the convention of your language/framework
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WORKDIR path/to/the/working/directory
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ENTRYPOINT [ "echo", "Hey Team 👋 (entrypoint)" ]
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CMD [ "+ (cmd)" ] |