Ubuntu 21.10 in docker

ubuntu-2110-in-docker.sh

#!/usr/bin/env bash
#
# Creates a persistent, SSHable ubuntu 21.10 in a container, including tmux.

docker stop my-ubuntu-ctr
docker rm my-ubuntu-ctr
docker rmi my-ubuntu

docker build -t my-ubuntu - << HERE
FROM ubuntu:21.10

ENV DEBIAN_FRONTEND=noninteractive

RUN apt update -y \
    && apt --no-install-recommends -y install \
    sudo \
    ca-certificates \
    openssh-server \
    iputils-ping \
    iproute2 \
    netcat \
    curl \
    traceroute \
    sudo \
    vim \
    tmux

RUN yes ubuntu | passwd
RUN useradd -m ubuntu && yes ubuntu | passwd ubuntu
RUN usermod -a -G sudo ubuntu
RUN chsh -s /bin/bash ubuntu
RUN echo '[[ ! -z \$TMUX ]] || tmux attach || tmux' >> /home/ubuntu/.bashrc 

RUN ( \
    echo 'LogLevel DEBUG2'; \
    echo 'PermitRootLogin yes'; \
    echo 'PasswordAuthentication yes'; \
  ) > /etc/ssh/sshd_config \
  && mkdir /run/sshd

CMD ["/usr/sbin/sshd", "-D", "-e", "-f", "/etc/ssh/sshd_config"]
HERE

docker create \
	-it \
	--name "my-ubuntu-ctr" \
	--restart unless-stopped \
	-p 127.0.0.1:2222:22 \
	-m "2048m" \
	--cpus="2" \
	--cpuset-cpus="4,5" \
	my-ubuntu

docker start "my-ubuntu-ctr"