Docker and Linux

Introductions

introductions of two to three students

Docker

We will use the Linux Practice homework to show you how to get started with Docker containers.

Linux

Quick survey on Linux background for the class:
- 1: Newbie
- 2: Some exposure
- 3: Lots of exposure
- 4: Use it every day
Review of the Linux Journey materials.

Dockerfile

Dockerfile for Alpine Linux and bash:

FROM alpine:latest
RUN apk update && apk add bash

Then:

docker build -t alpine_linux .
docker run -it alpine_linux /bin/bash

Dockerfile used to build the image for the homework

FROM ubuntu:20.04


# install ssh
RUN apt update && apt install -y openssh-server
# install needed packages
RUN apt install -y less


RUN mkdir /var/run/sshd
# Set root password for SSH access (change 'your_password' to your desired password)
RUN echo 'root:tolkien' | chpasswd
RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config
RUN sed -i 's/PermitRootLogin without-password/PermitRootLogin yes/' /etc/ssh/sshd_config

# setup bilbo user
RUN useradd -m -s /bin/bash bilbo
RUN echo "bilbo:ring" | chpasswd

EXPOSE 22
CMD ["/usr/sbin/sshd", "-D"]

Discussion

How does the command line give you access to basic OS functionality?
- file system
- access control
- processes