knot-prometheus-exporter

Dockerfile

@@ -1,10 +1,13 @@
 FROM sutty/monit:latest
 MAINTAINER "f <f@sutty.nl>"
 
-RUN apk add --no-cache knot
+RUN echo
+RUN apk add --no-cache knot knot-prometheus-exporter daemonize
 COPY ./monit.conf /etc/monit.d/knot.conf
+COPY ./prometheusd.sh /usr/local/bin/prometheusd
 
 EXPOSE 53
 EXPOSE 53/udp
+EXPOSE 5000
 
 VOLUME /var/lib/knot

monit.conf

@@ -4,3 +4,7 @@ check process knot with pidfile /tmp/knot.pid
   if 5 restarts within 8 cycles then alert
   if failed port 53 type udp protocol dns for 3 times within 5 cycles then restart
   if failed port 53 type tcp protocol dns for 3 times within 5 cycles then restart
+
+check process prometheus with pidfile /tmp/prometheus.pid
+  start program = "/usr/local/bin/prometheusd start"
+   stop program = "/usr/local/bin/prometheusd stop"

prometheusd.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+set -e
+
+case $1 in
+  start) rm -f /tmp/prometheus.pid ; daemonize -c /tmp -p /tmp/prometheus.pid -l /tmp/prometheus.pid -u nobody /usr/bin/knot-prometheus-exporter ${STATS:-/tmp/stats.yaml} ;;
+  stop) cat /tmp/prometheus.pid | xargs -r kill ;;
+esac