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Dockerfile template and snippets

Dockerfile templates and snippets for various applications and services.

User

Add user and install sudo support

Dockerfile
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ARG USERNAME=user
ARG USER_UID=1000
ARG USER_GID=$USER_UID

# Check if "ubuntu" user exists, delete it if it does, then create the desired user
RUN if getent passwd ubuntu > /dev/null 2>&1; then \
        userdel -r ubuntu && \
        echo "Deleted existing ubuntu user"; \
    fi && \
    groupadd --gid $USER_GID $USERNAME && \
    useradd -s /bin/bash --uid $USER_UID --gid $USER_GID -m $USERNAME && \
    echo "Created new user $USERNAME"

# Add sudo support for the non-root user
RUN apt-get update && apt-get install -y sudo \
  && echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME\
  && chmod 0440 /etc/sudoers.d/$USERNAME \
  && rm -rf /var/lib/apt/lists/*

usage

Terminal
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docker run --rm -it --user user my_ubuntu:22.04 id
#
uid=1000(user) gid=1000(user) groups=1000(user)

User with device access

TODO: move to embedded section

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usage

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docker run --rm -it \
--user user \
--group-add=dialout \
--device /dev/ttyACM0 \
my_ubuntu:22.04 \
ll /dev/ttyACM0