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建一个eg_sshd图像
下面Dockerfile在容器中设置一个SSHd服务，您可以使用该服务来连接并检查其他容器的卷，或者快速访问测试容器。
FROM ubuntu:16.04RUN apt-get update && apt-get install -y openssh-server RUN mkdir /var/run/sshd RUN echo 'root:screencast' | chpasswd RUN sed -i 's/PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config # SSH login fix. Otherwise user is kicked off after login RUN sed 's@session\s*required\s*pam_loginuid.so@session optional pam_loginuid.so@g' -i /etc/pam.d/sshd ENV NOTVISIBLE "in users profile"RUN echo "export VISIBLE=now" >> /etc/profile EXPOSE 22CMD ["/usr/sbin/sshd", "-D"]
使用以下命令构建图像
$ docker build -t eg_sshd .
运行一个test_sshd容器
然后运行它。然后，您可以使用它docker port来找出容器的端口22映射到的主机端口：
$ docker run -d -P --name test_sshd eg_sshd $ docker port test_sshd 220.0.0.0:49154
现在你可以root在容器的IP地址（你可以找到它docker inspect）或者49154Docker守护进程的主机IP地址的端口上（ip address或者ifconfig可以告诉你）或者localhost在Docker守护进程主机上ssh：
$ ssh root@192.168.1.2 -p 49154# The password is ``screencast``.root@f38c87f2a42d:/#
环境变量
使用sshd守护进程来生成shell会使得通过普通的Docker机制将环境变量传递到用户的shell变得很复杂，因为sshd它会在启动shell之前清理环境。
如果你的在设定值Dockerfile使用ENV，你需要将它们推到像一个shell初始化文件/etc/profile中的例子Dockerfile以上。
如果您需要传递docker run -e ENV=value值，则需要在开始之前编写一个简短的脚本来完成相同的操作sshd -D，然后CMD用该脚本替换。
清理
最后，通过停止并取出容器，然后移除图像，在测试后清理。
$ docker stop test_sshd $ docker rm test_sshd $ docker rmi eg_sshd