add prometheus_rabbitmq_exporter

Dockerfile

@@ -3,11 +3,13 @@ FROM rabbitmq:${RABBITMQ_VERSION}-management-alpine
 
 ENV RABBITMQ_ERLANG_COOKIE="cookiemonster"
 
+COPY rootfs/ /
+
+RUN /rmq_prom_get.sh
 RUN chgrp -R root /var/lib/rabbitmq /var/log/rabbitmq /etc/rabbitmq
 RUN chmod g+w /etc/passwd &&\
     chmod -R g+rwx /var/lib/rabbitmq /var/log/rabbitmq /etc/rabbitmq
 
-ADD launch.sh /launch.sh
 VOLUME /var/lib/rabbitmq
 EXPOSE 15672/tcp 25672/tcp 4369/tcp 5671/tcp 5672/tcp
 

rootfs/rmq_prom_get.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+# Adapted from https://www.rabbitmq.com/prometheus.html
+
+# make sure the directory exists
+mkdir -p /opt/rabbitmq/plugins
+cd /opt/rabbitmq/plugins
+
+# Downloads prometheus_rabbitmq_exporter and its dependencies with wget
+
+readonly base_url='https://github.com/deadtrickster/prometheus_rabbitmq_exporter/releases/download/v3.7.2.3'
+
+get() {
+  wget "$base_url/$1"
+}
+
+get accept-0.3.3.ez
+get prometheus-3.5.1.ez
+get prometheus_cowboy-0.1.4.ez
+get prometheus_httpd-2.1.8.ez
+get prometheus_process_collector-1.3.1.ez
+get prometheus_rabbitmq_exporter-3.7.2.3.ez