How to SSH into Docker

Question

I d like to create the following infrastructure flow     How can that be achieved using Docker

User · Answer

It is a short way but not permanent

first create a container

docker run  ..... -p 22022:2222 .....

port 22022 on your host machine will map on 2222, we change the ssh port on container later , then on your container executing the following commands

apt update && apt install  openssh-server # install ssh server
passwd #change root password

in file /etc/ssh/sshd_config change these : uncomment Port and change it to 2222

Port 2222

uncomment PermitRootLogin to

PermitRootLogin yes

and finally restart ssh server

/etc/init.d/ssh start

you can login to your container now

ssh -p 2022 root@HostIP

Remember : if you restart the container you need to restart ssh server again

User · Answer

Create docker image with openssh-server preinstalled   Dockerfile  FROM ubuntu 16 04  RUN apt-get update  amp  amp  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   gt  gt   etc profile  EXPOSE 22 CMD    usr sbin sshd    -D     Build the image using     docker build -t eg sshd     Run a test sshd container     docker run -d -P --name test sshd eg sshd   docker port test sshd 22  0 0 0 0 49154   Ssh to your container     ssh root 192 168 1 2 -p 49154   The password is   screencast    root f38c87f2a42d      Source  https   docs docker com engine examples running ssh service  build-an-eg sshd-image

User · Answer

Firstly you need to install a SSH server in the images you wish to ssh-into  You can use a base image for all your container with the ssh server installed  Then you only have to run each container mapping the ssh port  default 22  to one to the host s ports  Remote Server in your image   using -p  lt hostPort gt   lt containerPort gt   i e   docker run -p 52022 22 container1  docker run -p 53022 22 container2   Then  if ports 52022 and 53022 of host s are accessible from outside  you can directly ssh to the containers using the ip of the host  Remote Server  specifying the port in ssh with -p  lt port gt   I e    ssh -p 52022 myuser RemoteServer --  SSH to container1  ssh -p 53022 myuser RemoteServer --  SSH to container2

User · Answer

I guess it is possible  You just need to install a SSH server in each container and expose a port on the host  The main annoyance would be maintaining remembering the mapping of port to container   However  I have to question why you d want to do this  SSH ng into containers should be rare enough that it s not a hassle to ssh to the host then use docker exec to get into the container

User · Answer

These files will successfully open sshd and run service so you can ssh in locally   you are using cyberduck aren t you    Dockerfile      FROM swiftdocker swift MAINTAINER Nobody  RUN apt-get update  amp  amp  apt-get -y install openssh-server supervisor RUN mkdir  var run sshd RUN echo  root password    chpasswd RUN sed -i  s PermitRootLogin without-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   gt  gt   etc profile  COPY supervisord conf  etc supervisor conf d supervisord conf  EXPOSE 22 CMD    usr bin supervisord     supervisord conf   supervisord  nodaemon true   program sshd  command  usr sbin sshd -D   to build   run start daemon   jump into shell   docker build -t swift3-ssh     docker run -p 2222 22 -i -t swift3-ssh docker ps   find container id docker exec -i -t  lt containerid gt   bin bash

User · Answer

Notice  this answer promotes a tool I ve written   The selected answer here suggests to install an SSH server into every image  Conceptually this is not the right approach  https   docs docker com articles dockerfile best-practices     I ve created a containerized SSH server that you can  stick  to any running container  This way you can create compositions with every container  The only requirement is that the container has bash   The following example would start an SSH server exposed on port 2222 of the local machine     docker run -d -p 2222 22     -v  var run docker sock  var run docker sock     -e CONTAINER my-container -e AUTH MECHANISM noAuth     jeroenpeeters docker-ssh    ssh -p 2222 localhost   For more pointers and documentation see  https   github com jeroenpeeters docker-ssh     Not only does this defeat the idea of one process per container  it is also a cumbersome approach when using images from the Docker Hub since they often don t  and shouldn t  contain an SSH server

[docker] How to SSH into Docker?

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