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Kubernete

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Docker

How to build your own docker image

Docker image can be automatically built by using Dockerfile. The whole summary base on the docker documentation.

1. Image building command usage:

   docker build <path> -<flag> parameter <file path>

   We can use different flags to specialize the image.

   flag	instruction
   -f	point to a Dockerfile in the file system
   -t	tag an image

2. Dockerfile Format:

   The file is not case-sensitive. But the convention is to UPPERCASE the comments to distinguish them easily. A Dockerfile must start with FORM instruction.

   Example:

    FROM busybox
    ENV foo /bar
    WORKDIR ${foo}   # WORKDIR /bar
    ADD . $foo       # ADD . /bar
    COPY \$foo /quux # COPY $foo /quux
   

   • FROM: initialize a new image and set the Base Image.
     • ARG is the only instruction that may precede FROM and can declare the variables.
   • RUN:
     • RUN <command>: run command in a shell equal to /bin/sh -c or cmd /S /C
     • RUN ["executable", "param1", "param2"]: exec form
   • CMD: There can only be one CMD instruction in a Dockerfile. If you list more than one CMD then only the last CMD will take effect.
     • The main purpose of a CMD is to provide defaults for an executing container.
     • CMD ["executable","param1","param2"] (exec form, this is the preferred form)
     • CMD ["param1","param2"] (as default parameters to ENTRYPOINT)
     • CMD command param1 param2 (shell form)
   • LABEL: add metadata to an image. It is a key-value pair.
   • MAINTAINER: set the Author field of the generated image.
     • example: LABEL maintainer="SvenDowideit@home.org.au" - EXPOSE : inform Docker that the container listens on the specified network prots at runtime. - ENV : set the environment vatiable `` to the ``

- ADD - COPY - ENTRYPOINT - VOLUME - USER - WORKDIR - ONBUILD - STOPSIGNAL - HEALTHCHECK - SHELL

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Tutorial: Make a laravel docker image