Docker Ubuntu 20.04.6 LTS: SSH Connection Works, SCP One-Way
In this article, we will discuss how to set up a Docker container with Ubuntu 20.04.6 LTS and establish an SSH connection to it. We will also cover how to transfer files using SCP, but with a one-way transfer limitation.
Setting up the Docker Container
To start, you need to have Docker installed on your local machine. Once you have Docker up and running, you can create a new container with Ubuntu 20.04.6 LTS as the base image. Here's an example Dockerfile:
FROM ubuntu:20.04
RUN apt-get update && apt-get install -y openssh-server
RUN mkdir /var/run/sshd
RUN echo 'root:root' | chpasswd
RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config
EXPOSE 22
CMD ["/usr/sbin/sshd", "-D"]This Dockerfile installs the OpenSSH server and sets up the necessary configurations to allow root login via SSH. Once you have built the Docker image and run the container, you can access it via SSH using the following command:
docker exec -it <container_id> /bin/bashEstablishing an SSH Connection
To establish an SSH connection to the Docker container, you need to obtain the container's IP address. You can do this by running the following command:
docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' <container_id>Once you have the container's IP address, you can use an SSH client (such as PuTTY on Windows or the built-in SSH client on Linux/Mac) to connect to it. Use the following command to connect:
ssh root@<container_ip_address>Transferring Files with SCP
To transfer files to the Docker container, you can use the SCP protocol. However, due to the nature of Docker containers, the file transfer is one-way only. This means that you can transfer files from your local machine to the container, but not the other way around.
Here's an example command to transfer a file from your local machine to the Docker container:
scp /path/to/local/file root@<container_ip_address>:/path/in/container- In this article, we discussed how to set up a Docker container with Ubuntu 20.04.6 LTS and establish an SSH connection to it.
- We also covered how to transfer files using SCP, but with a one-way transfer limitation.
- To establish an SSH connection, you need to obtain the container's IP address and use an SSH client to connect to it.
- To transfer files to the Docker container, you can use the SCP protocol. However, the file transfer is one-way only.