SSH into Docker

gistfile1.txt

FROM python:3.8-buster
RUN apt-get update && apt-get install -y --no-install-recommends openssh-server
RUN mkdir -p /run/sshd && mkdir -p /var/run/sshd && mkdir -p /root/.ssh

ARG PWD
RUN ssh-keygen -A
RUN echo "root:$PWD" | chpasswd
RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config

EXPOSE 22

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

gistfile2.txt

docker build --build-args PWD=SOMPASS -t ssh .
docker run -d --name ssh01 ssh 
docker inspect -f "{{ .NetworkSettings.IPAddress }}" ssh01

ssh root@IPADDR
ssh -o PreferredAuthentications=password -o PubkeyAuthentication=no -p 22 root@172.17.0.2