Merge branch 'master' into antifascista

Dockerfile

@@ -2,3 +2,13 @@ ARG ALPINE_VERSION=3.13.6
 ARG BASE_IMAGE=sutty/monit
 FROM ${BASE_IMAGE}:${ALPINE_VERSION}
 MAINTAINER "f <f@sutty.nl>"
+
+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

@@ -0,0 +1,10 @@
+check process knot with pidfile /tmp/knot.pid
+  start program = "/usr/sbin/knotd -d"
+  stop  program = "/usr/sbin/knotc stop"
+  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 +1,12 @@
+#!/bin/sh
+set -e
+
+STATS=${STATS:-/tmp/stats.yaml}
+
+case $1 in
+  start)
+    rm -f /tmp/prometheus.pid
+    daemonize -c /tmp -p /tmp/prometheus.pid -l /tmp/prometheus.pid -u knot /usr/bin/knot-prometheus-exporter ${STATS}
+    ;;
+  stop) cat /tmp/prometheus.pid | xargs -r kill ;;
+esac