Build operating system image

Follow this process to build a Linux® operating system image for use in a docker container.

1. Make a directory with a name that relates to your image.
   For example, a directory called debian may contain a Dockerfile for your Debian® image.

   mkdir debian

2. With a text editor create the file as shown, and save it as Dockerfile.

   FROM debian:latest
   RUN apt-get update \
     && apt-get install -y --no-install-recommends --no-install-suggests \
          file \
          bzip2 \
          binutils \
          sqlite3 \
          sudo \
      && apt-get clean \
      && rm -rf /var/lib/apt/lists/*
   
      ARG user=genero
      ARG group=fourjs
      ARG uid=2000
      ARG gid=2000
   
      ENV HOME=/home/${user}
   
   RUN set -eufx \
     && groupadd -g "${gid}" "${group}" \
     && useradd -d "${HOME}" -u "${uid}" -g "${gid}" -M -N -r -s /bin/bash "${user}" \
     && mkdir -p "${HOME}" \
     && chown "${user}:${group}" "${HOME}" \
    WORKDIR ${HOME}
    USER ${user}

   The docker file contains all the commands needed to get the latest updates and build the Debian image. The user ("genero") and group ("fourjs") are added. A home directory and environment is set up for the user.

   Note: The Dockerfile file is written following specific Dockerfile instructions. For more information see the Docker documentation.
3. At the command line, type the following commands to build the image from your Dockerfile:

   docker pull debian:latest

   docker build --force-rm -t fglgws-os .

   The docker pull command pulls a pre-built Debian image from the Docker repository. The docker build command builds an image called fglgws-os based on the Dockerfile found in the current directory, represented by the dot (.).

4. Get a list of docker images.

   docker images

   Your docker image (fglgws-os) is shown in the list.