Dockerfile

# Use an official lightweight Alpine Linux image as the base
FROM alpine:latest

# Install dnsmasq and curl (for health checks)
RUN apk --no-cache add dnsmasq curl

# Create a directory for the dnsmasq configuration
RUN mkdir -p /etc/dnsmasq.d

# Create dnsmasq.conf inline
RUN echo ' \
# Redirect lehrastudio.com to the IP of 195.179.239.105 \n\
address=/lehrastudio.com/195.179.239.105 \n\
# Log DNS queries (optional) \n\
log-queries \n\
# Set DNSmasq to listen on all interfaces \n\
listen-address=0.0.0.0 \n\
# Specify the port for DNS queries \n\
port=7860 \n\
' > /etc/dnsmasq.conf

# Expose port 7860 (the custom DNS port)
EXPOSE 7860/udp

# Command to start dnsmasq in the foreground 
CMD ["dnsmasq", "-k"]