password define for ssh connection into docker container

Question

I would like to connect with SSH into my docker container. For that I created image with this Dockerfile and this command docker build -t test/toto . :

FROM ubuntu:14.04.4
MAINTAINER Darkomen <[email protected]>

# Let the conatiner know that there is no tty
ENV DEBIAN_FRONTEND noninteractive

RUN sudo apt-get -y update

RUN sudo apt-get -y install software-properties-common python-software-properties
RUN sudo add-apt-repository main
RUN sudo add-apt-repository universe
RUN sudo add-apt-repository restricted
RUN sudo add-apt-repository multiverse

RUN sudo apt-get -y update

#RUN sudo apt-get -y install linux-headers-$(uname -r) build-essential
RUN sudo apt-get -y install linux-headers-generic build-essential
RUN apt-get -y install zlib1g-dev libssl-dev libreadline-gplv2-dev
RUN apt-get -y install curl unzip
RUN apt-get -y install software-properties-common
RUN apt-get -y install gnupg2

# others tools
RUN sudo apt-get -y install nano
RUN sudo apt-get -y install vim
RUN sudo apt-get -y install aptitude
RUN sudo apt-get -y install git
RUN sudo apt-get -y install openjdk-7-jdk
RUN sudo apt-get -y install whois
RUN sudo apt-get -y install dos2unix

# SSH
RUN apt-get -y install openssh-server
RUN mkdir -p /var/run/sshd
RUN echo 'root:screencast' |chpasswd

EXPOSE 22
CMD    /usr/sbin/sshd -D

next I launched my container with this image with this command : docker run test/toto -p 42000:22

My container run perfectly and I launch this command for enter into this container : docker run -dt -p 42000:22 test/toto

Now my docker-machine and docker container (based on my dockerfile) run. I can view that because docker ps -a tell me that :

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                        PORTS                   NAMES
a28ad08fd393        test/toto           "/bin/sh -c '/usr/sbi"   22 minutes ago      Up 22 minutes                 0.0.0.0:42000->22/tcp   admiring_feynman

For connecting in my container I launch this command : ssh [email protected] -p 42000

But it tell me to enter a password. I try lot of thing but nothing run. What I do forget in my process of creation and configuration docker ?

192.168.99.100 is the IP return by the docker-machine inspect command

I also tried to change root password into my container and repeat ssh command access. But nothing change. I can't connecting to container.

technical information:

• OS : windows 7 Pro
• Docker version : 1.12.2 build bb80604
• Docker system : docker toolbox (based on VirtualBox)
• VirtualBox version : 5.0.14r105127

Answer 1

You need to configure root login for your sshd:

Manual:

vi /etc/ssh/sshd_config

Change PermitRootLogin without-password to:

PermitRootLogin yes

Then:

service ssh restart

Now try again. If everything went fine, you need to change your docker file to make this change in the build steps.

Answer 2

Dockerfile script for create and expose a SSH connection into container :

# SSH
RUN apt-get -y install openssh-server
RUN mkdir -p /var/run/sshd

# authorize SSH connection with root account
RUN sed -i '/^#/!s/PermitRootLogin .*/PermitRootLogin yes/' /etc/ssh/sshd_config
RUN sudo service ssh restart

# change password root
RUN echo "root:docker"|chpasswd