Dockerize an SSH service

Dockerfile-ssh

FROM ubuntu:18.04

ARG USER=docker
ARG PASS=docker
ARG UID=1000
ARG GID=1000

RUN sed -i 's/\(archive\|security\).ubuntu.com/mirrors.tuna.tsinghua.edu.cn/g' /etc/apt/sources.list \
  && mkdir /var/run/sshd \
  && apt-get update \
  && apt-get install -y \
  git \
  vim \
  curl \
  wget \
  sudo \
  net-tools \
  openssh-server \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /usr/share/doc/*

RUN groupadd -g ${GID} ${USER} \
  && useradd -rm -s /bin/bash -g ${GID} -G sudo -u ${UID} ${USER} \
  && echo "${USER}:${PASS}" | chpasswd

CMD ["/usr/sbin/sshd", "-D"]