FROM debian:bullseye-slim
MAINTAINER Christian Busch <hello@chbus.ch>

# Install NSD and required tools
RUN apt-get update && \
    apt-get install -y --no-install-recommends nsd tzdata && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

# Create necessary directories
RUN mkdir -p /var/lib/nsd /var/run/nsd /etc/nsd/conf.d

# Copy entrypoint script
COPY entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh

# Volume for configuration and data
VOLUME ["/etc/nsd", "/var/lib/nsd"]

# Expose standard NSD port
EXPOSE 53/tcp 53/udp

# Set start command
ENTRYPOINT ["/entrypoint.sh"]