Local Ansible - Vagrant with Docker Provider

Dockerfile

##############################################################################################
# This helps unblock me on following a long with materials for learning Ansible and Kubernetes
# locally, which rely on a VM service.
#
# I did not want to use VirtualBox, because on Linux it requires tainting the kernel. I also
# already have Docker installed and it's said to have better performance/less overhead.
#
# This Dockerfile will setup an Ubuntu container and configure it to support SSH, which is 
# required for testing Ansible locally with Vagrant.
#
# Credit to Mario Garcia
# Medium Article: https://dev.to/mattdark/using-docker-as-provider-for-vagrant-10me
##############################################################################################
FROM ubuntu

# When running apt-get update -y or apt update -y, it will ask you to configure
# the timezone, the prompt will wait for you to enter the selected option.
# To avoid this, we add these configuration options.
ENV TZ=America/Mexico_City
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone

RUN apt-get update -y

RUN apt-get install -y --no-install-recommends ssh sudo

# Creates `vagrant` user. With Vagrant, we don't want to require a password for root level commands
# We also add them to the sudoers group
RUN useradd --create-home -s /bin/bash vagrant
RUN echo -n 'vagrant:vagrant' | chpasswd
RUN echo 'vagrant ALL = NOPASSWD: ALL' > /etc/sudoers.d/vagrant
RUN chmod 440 /etc/sudoers.d/vagrant

# Create the `.ssh` directory
RUN mkdir -p /home/vagrant/.ssh
RUN chmod 700 /home/vagrant/.ssh

# Vagrant connnects over ssh. Add an insecure key. It wil be replaced by Vagrant with a secure key on first `vagrant up`
RUN echo "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA6NF8iallvQVp22WDkTkyrtvp9eWW6A8YVr+kz4TjGYe7gHzIw+niNltGEFHzD8+v1I2YJ6oXevct1YeS0o9HZyN1Q9qgCgzUFtdOKLv6IedplqoPkcmF0aYet2PkEDo3MlTBckFXPITAMzF8dJSIFo9D8HfdOV0IAdx4O7PtixWKn5y2hMNG0zQPyUecp4pzC6kivAIhyfHilFR61RGL+GPXQ2MWZWFYbAGjyiYJnAmCP3NOTd0jMZEnDkbUvxhMmBYSdETk1rRgm+R4LOzFUGaHqHDLKLX+FIPKcF96hrucXzcWyLbIbEgE98OHlnVYCzRdK8jlqm8tehUc9c9WhQ==" > /home/vagrant/.ssh/authorized_keys
RUN chmod 600 /home/vagrant/.ssh/authorized_keys
RUN chown -R vagrant:vagrant /home/vagrant/.ssh

RUN sed -i -e 's/Defaults.*requiretty/#&/' /etc/sudoers
RUN sed -i -e 's/\(UsePAM \)yes/\1 no/' /etc/ssh/sshd_config

RUN mkdir /var/run/sshd

RUN apt-get -y install openssh-client

EXPOSE 22

# This makes Docker run the SSH daemon in the foreground. Docker expects a foreground process to be running or it will
# close the container immediately.
CMD ["/usr/sbin/sshd", "-D"]

Vagrantfile

# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant.configure("2") do |config|
  config.vm.provider "docker" do |d|
    # Use `Dockerfile` that's in the same directory as `Vagrantfile`
    d.build_dir = "."
    
    # Tells Vagrant to expect this Docker container to remain running
    d.remains_running = true
    
    # Required for Vagrant to support SSH with the Docker container
    d.has_ssh = true
  end
end