Dockerfile

FROM ubuntu:16.04

# package

RUN apt-get update; apt-get -y install ssh

COPY ssh_config /etc/ssh/ssh_config

# ssh

RUN sed -i 's/UsePAM yes/UsePAM no/g' /etc/ssh/sshd_config && sed -i 's/PermitRootLogin without-password/PermitRootLogin yes/g' /etc/ssh/sshd_config

RUN echo "root:root" | chpasswd

RUN echo "root   ALL=(ALL)       ALL" >> /etc/sudoers

RUN ssh-keygen -t rsa -f ~/.ssh/id_rsa -P '' && \

    cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

RUN mkdir /var/run/sshd

EXPOSE 22

CMD [ "sh", "-c", "service ssh start && bash"]

生成镜像

docker build -t sshimage ./

验证ssh互信

　　启动第一个docker容器，然后会进入bash，执行hostname -i来获取ip。

# docker run --rm -it sshimage

root@cbdf1f5e7e0f:/# hostname -i

172.17.0.4

　　再启动另一个容器，并执行ssh $ip。

# docker run --rm -it sshimage

 * Starting OpenBSD Secure Shell server sshd                             [ OK ]

root@ecaa455762df:/# ssh 172.17.0.4

Warning: Permanently added '172.17.0.4' (ECDSA) to the list of known hosts.

root@cbdf1f5e7e0f:~# hostname -i

172.17.0.4

　　可以看到，ssh成功。