Dockerfile

FROM ubuntu:18.04

RUN echo "deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse" > /etc/apt/sources.list
RUN echo "deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse" >> /etc/apt/sources.list
RUN echo "deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse" >> /etc/apt/sources.list
RUN echo "deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse" >> /etc/apt/sources.list
RUN echo "deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse" >> /etc/apt/sources.list

RUN apt update

RUN apt install -y openssh-server git
RUN mkdir /var/run/sshd

RUN echo 'root:root' |chpasswd

RUN sed -ri 's/^#?PermitRootLogin\s+.*/PermitRootLogin yes/' /etc/ssh/sshd_config
RUN sed -ri 's/UsePAM yes/#UsePAM yes/g' /etc/ssh/sshd_config

RUN mkdir /root/.ssh

RUN apt clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

EXPOSE 22

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