Dockerfile

FROM busybox
MAINTAINER Ric Lister <rlister@gmail.com>

## busybox wget cannot do https, so grab curl binary
ENV CURL_VERSION 7.30.0
RUN (wget -O - http://www.magicermine.com/demos/curl/curl/curl-${CURL_VERSION}.ermine.tar.bz2 | bunzip2 -c - | tar xf -) \
    && mv /curl-${CURL_VERSION}.ermine/curl.ermine /bin/curl \
    && rm -rf /curl-${CURL_VERSION}.ermine

WORKDIR /app

## edit this to add/remove users by their github username
ENV USERS alice bob cathy dan

## download public keys from github, add newline to each file for update-ssh-keys on CoreOS
RUN for user in $USERS; do curl -k https://github.com/${user}.keys -o ${user}; echo >> ${user}; done

ADD ./run.sh /app/run.sh

## write keys to mounted volume
CMD [ "./run.sh" ]

run.sh

#!/bin/sh

rm -f /keys/*

for user in $USERS
do
  cp $user /keys/.
  chown 500:500 /keys/$user
  chmod 0400 /keys/$user
done

ssh_keys.service

[Unit]
Description=SSH key delivery
Requires=docker.service

[Service]
Type=oneshot
User=core
ExecStartPre=-/usr/bin/docker rm ssh_keys
ExecStartPre=/usr/bin/docker pull index.mydomain.com/ssh_keys:master
ExecStart=/bin/bash -c 'docker run --name ssh_keys -v /home/core/.ssh/authorized_keys.d:/keys index.mydomain.com/ssh_keys:master && update-ssh-keys -l'

[X-Fleet]
Global=true

ssh_keys.timer

[Unit]
Description=SSH key update
Requires=docker.service
Requires=ssh_keys.service

[Timer]
OnBootSec=1min
OnUnitActiveSec=1h
Unit=ssh_keys.service

[X-Fleet]
Global=true

Simple docker image to download and deliver employee ssh keys to CoreOS hosts.