docker-ssh-jumphost/Dockerfile

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FROM alpine
RUN apk add --update openssh
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COPY sshd_config /etc/ssh/sshd_jumpuser_config
RUN echo "Include /etc/ssh/sshd_jumpuser_config" >> /etc/ssh/sshd_config
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RUN adduser -D -s /bin/sh -H jumpuser
RUN passwd -u -d jumpuser
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EXPOSE 2222
COPY entrypoint.sh /usr/local/bin/entrypoint.sh
RUN chmod +x /usr/local/bin/entrypoint.sh
ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]