Our Docker container is now running host port 2022. We also map docker port 22 to host port 2022. The following command starts the docker image just created named “sshubuntu”. Note that if you’re running this command from a Linux client, you might need to prefix the docker command with sudo since it requires elevated permissions to run. This command compiles a new docker image called “sshubuntu” based on the script inside the Dockerfile. Now from within the same directory, execute the docker build command: $ docker build -t sshubuntu. Then it installs the OpenSSH server, adds a new user named "sshuser", copies the SSH public key file to the authorized_keys file in the container, starts the SSH service (using systemctl), exposes port 22 and finally runs the SSH daemon. This Dockerfile file starts by pulling the ubuntu:latest base image. RUN chown sshuser:sshgroup /home/sshuser/.ssh/authorized_keys & chmod 600 /home/sshuser/.ssh/authorized_keys They are under ~/.ssh directory by default.ĬOPY idkey.pub /home/sshuser/.ssh/authorized_keys The idkey.pub below is a public key file you get from ssh-keygen. # Copy the ssh public key in the authorized_keys file. RUN groupadd sshgroup & useradd -ms /bin/bash -g sshgroup sshuser ![]() # Create a user “sshuser” and group “sshgroup” RUN apt update & apt install openssh-server sudo -y Next, create a new directory named "sshdemo" and create a Dockerfile. If you do not have one, follow our blog on how to set up SSH keys. ![]() Step 1 - Build docker image with OpenSSHįirst, you will need an SSH keypair. This repository comes with the necessary Dockerfile and Linux image references so that you can get started immediately.īelow, we will set things up from scratch so you can follow along step by step. This means packaging the OpenSSH server beside your containerized application.įor a quick demo of sshing into a Docker container, you can check the docker image published by LinuxServer.io LinuxServer-OpenSSH-Server. To enable SSH, the docker image must be pre-configured with an OpenSSH server. Method 1: Docker shell using OpenSSHįirst, let's look at how to enable SSH in a container. This post will explore two methods to get shell access into a Docker container using OpenSSH and the docker exec command. While SSH is familiar, Docker provides more lightweight and easier-to-use methods that don't require running your container with an SSH server. Click OK when ready.SSH has always been the default mechanism to get remote shell access into a running Unix or Linux operating system from a terminal client to execute commands. ![]() Type in the desired password, and confirm it immediately below. The username is sshd, and it is case sensitive. After checking the I accept checkbox, the SSH username will be provided, as well as an option to type in a desired password.
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