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Ubuntu ssh-server

cd 
mkdir devubuntu
cd devubuntu 
# vi Dockerfile 

FROM ubuntu:latest

RUN apt-get update && \
    DEBIAN_FRONTEND="noninteractive" apt-get install -y inetutils-ping openssh-server && \
    rm -rf /var/lib/apt/lists/*

RUN mkdir /run/sshd && \
    echo 'root:root' | chpasswd && \
    sed -ri 's/^#?PermitRootLogin\s+.*/PermitRootLogin yes/' /etc/ssh/sshd_config && \
    sed -ri 's/UsePAM yes/#UsePAM yes/g' /etc/ssh/sshd_config && \
    mkdir /root/.ssh

EXPOSE 22/tcp

CMD ["/usr/sbin/sshd","-D"]
docker build -t devubuntu . 
docker run --name=devjoy -p 2222:22  -d -t devubuntu3

ssh root@localhost -p 2222
# example, if your docker host ist 192.168.56.101 v
ssh root@192.168.56.101 -p 2222