dockerfile

FROM ubuntu:20.04

ARG DEBIAN_FRONTEND=noninteractive

ENV pip_packages "ansible"

# Install dependencies.
RUN apt-get update \
    && apt-get install -y --no-install-recommends \
       apt-utils \
       build-essential \
       locales \
       unzip \
       wget \
       libffi-dev \
       libssl-dev \
       libyaml-dev \
       python3-dev \
       python3-setuptools \
       python3-pip \
       python3-yaml \
       software-properties-common \
       rsyslog systemd systemd-cron sudo iproute2 \
    && apt-get clean \
    && rm -Rf /var/lib/apt/lists/* \
    && rm -Rf /usr/share/doc && rm -Rf /usr/share/man
RUN sed -i 's/^\($ModLoad imklog\)/#\1/' /etc/rsyslog.conf

# Fix potential UTF-8 errors with ansible-test.
RUN locale-gen en_US.UTF-8

# Install Ansible via Pip.
RUN pip3 install $pip_packages

# Install Ansible inventory file.
RUN mkdir -p /etc/ansible
RUN echo "[local]\nlocalhost ansible_connection=local" > /etc/ansible/hosts

# Remove unnecessary getty and udev targets that result in high CPU usage when using
# multiple containers with Molecule (https://github.com/ansible/molecule/issues/1104)

RUN rm -f /lib/systemd/system/multi-user.target.wants/* \
  /etc/systemd/system/*.wants/* \
  /lib/systemd/system/local-fs.target.wants/* \
  /lib/systemd/system/sockets.target.wants/*udev* \
  /lib/systemd/system/sockets.target.wants/*initctl* \
  /lib/systemd/system/sysinit.target.wants/systemd-tmpfiles-setup* \
  /lib/systemd/system/systemd-update-utmp* \
  /lib/systemd/system/getty.target

CMD [ "/lib/systemd/systemd", "log-level=info", "unit=sysinit.target" ]