Dockerfile

FROM ubuntu:22.04
RUN apt-get update && apt-get install -y openssh-server
RUN mkdir /var/run/sshd
RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config
RUN sed -i 's|#AuthorizedKeysFile     .ssh/authorized_keys .ssh/authorized_keys2|AuthorizedKeysFile     .ssh/authorized_keys .ssh/authorized_keys2|' /etc/ssh/sshd_config
RUN sed 's@session\s*required\s*pam_loginuid.so@session optional pam_loginuid.so@g' -i /etc/pam.d/sshd
RUN mkdir /root/.ssh
RUN touch /root/.ssh/authorized_keys 
EXPOSE 22
CMD ["/usr/sbin/sshd", "-D"]