FROM prom/alertmanager:v0.25.0

# Copy configuration
COPY alertmanager.yml /etc/alertmanager/alertmanager.yml

# Create templates directory
USER root
RUN mkdir -p /etc/alertmanager/templates && \
    chown -R nobody:nobody /etc/alertmanager

USER nobody

# Expose Alertmanager port
EXPOSE 9093

# Start Alertmanager
CMD ["--config.file=/etc/alertmanager/alertmanager.yml", \
     "--storage.path=/alertmanager", \
     "--web.external-url=http://localhost:9093"]