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FROM ubuntu:18.04
RUN set -x \
&& apt-get update \
&& apt-get install -y \
netcat \
&& rm -rf /var/lib/apt/lists/*
# Accept a host and port parameter.
ENV host localhost
ENV port 8080
# Spin until we make a successful request.
CMD ["sh", "-c", "while ! nc -zv $host $port; do true; done"]
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