Docker Image based on Ubuntu Focal with SSH

Dockerfile

FROM ubuntu:focal

RUN apt-get update && \
    DEBIAN_FRONTEND=noninteractive apt-get install -y ssh && \
    apt-get clean

RUN sed -i 's/#PasswordAuthentication yes/PasswordAuthentication yes/g' /etc/ssh/sshd_config && \
    sed -i 's/#LogLevel INFO/LogLevel INFO/g' /etc/ssh/sshd_config && \
    service ssh restart

# RUN echo root:root | chpasswd

RUN useradd -m -s /bin/bash ubuntu && \
    echo ubuntu:ubuntu | chpasswd

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