alpine

Dockerfile

# A seashell buried in the sand, meant only to hear the sea at night.
# see https://hub.docker.com/r/phuslu/alpine/

FROM alpine:3.21
RUN \
  apk update && \
  apk upgrade && \
  apk add --update --no-cache \
    bash \
    bind-tools \
    curl \
    dropbear \
    fastfetch \
    gcompat \
    htop \
    iproute2 \
    jq \
    lsblk \
    openrc \
    openssh-client \
    openssh-sftp-server \
    openssl \
    procps \
    rsync \
    tmux \
    tzdata \
    vim \
    xz && \
  # add openrc configs for docker
  echo $'\n\
rc_env_allow="*"\n\
rc_logger="YES"\n\
rc_provide="loopback net"\n\
rc_sys="docker"\n'\
>> /etc/rc.conf && \
  # modify other configs
  sed -i '/^for _cmd; do$/,/^done$/d' /usr/libexec/rc/sh/openrc-run.sh && \
  sed -i 's/mount -t tmpfs/true/g' /usr/libexec/rc/sh/init.sh && \
  sed -i 's/hostname $opts/# hostname $opts/g' /etc/init.d/hostname && \
  sed -i 's/^DROPBEAR_OPTS=.*/DROPBEAR_OPTS="-p 127.0.0.1:22"/' /etc/conf.d/dropbear && \
  sed -i '/tty/d' /etc/inittab && \
  rm -f /etc/init.d/hwclock \
        /etc/init.d/hwdrivers \
        /etc/init.d/modules \
        /etc/init.d/modules-load \
        /etc/init.d/modloop && \
  # add cloudinit
  echo $'#!/sbin/openrc-run\n\
description="start cloudinit"\n\
depend() {\n\
  after dropbear\n\
}\n\
start()\n\
{\n\
  if test -n "$cloudinit" ; then\n\
    bash <(curl -sSlf $cloudinit)\n\
  fi\n\
  return 0\n\
}\n'\
> /etc/init.d/cloudinit && \
  chmod +x /etc/init.d/cloudinit && \
  # add auto-start services
  rc-update add dropbear default && \
  rc-update add cloudinit default && \
  # set bash for root
  sed -i 's#root:x:0:0:root:/root:/bin/sh#root:x:0:0:root:/root:/bin/bash#g' /etc/passwd && \
  curl -sSlf phus.lu/bashrc >/root/.bash_profile

CMD ["init"]