From b7d4f92ad22336b417ebe6ef471c0fd1229a993e Mon Sep 17 00:00:00 2001
From: Jeremy Lecour <jlecour@evolix.fr>
Date: Wed, 29 Nov 2017 14:17:38 +0100
Subject: [PATCH] rabbitmq: add a munin plugin

---
 rabbitmq/files/rabbitmq_connections | 66 +++++++++++++++++++++++++++++
 rabbitmq/handlers/main.yml          |  6 ++-
 rabbitmq/tasks/main.yml             | 11 +++++
 rabbitmq/tasks/munin.yml            | 45 ++++++++++++++++++++
 4 files changed, 127 insertions(+), 1 deletion(-)
 create mode 100644 rabbitmq/files/rabbitmq_connections
 create mode 100644 rabbitmq/tasks/munin.yml

diff --git a/rabbitmq/files/rabbitmq_connections b/rabbitmq/files/rabbitmq_connections
new file mode 100644
index 00000000..fb254604
--- /dev/null
+++ b/rabbitmq/files/rabbitmq_connections
@@ -0,0 +1,66 @@
+#!/bin/sh
+# 
+# Plugin to monitor the number of connections to RabbitMQ
+#
+# Usage: Link or copy into /etc/munin/node.d/
+#
+# Parameters
+#     env.conn_warn <warning connections>
+#     env.conn_crit <critical connections>
+#
+# Magic markers (optional - only used by munin-config and some
+# installation scripts):
+#
+#%# family=auto
+#%# capabilities=autoconf
+
+# If run with the "autoconf"-parameter, give our opinion on wether we
+# should be run on this system or not. This is optinal, and only used by
+# munin-config. In the case of this plugin, we should most probably
+# always be included.
+
+if [ "$1" = "autoconf" ]; then
+	echo yes
+	exit 0
+fi
+
+HOME=/tmp/
+
+# If run with the "config"-parameter, give out information on how the
+# graphs should look. 
+
+if [ "$1" = "config" ]; then
+        CONN_WARN=${queue_warn:-500}
+        CONN_CRIT=${queue_crit:-1000}
+
+	# The host name this plugin is for. (Can be overridden to have
+	# one machine answer for several)
+
+	# The title of the graph
+	echo 'graph_title RabbitMQ connections'
+	# Arguments to "rrdtool graph". In this case, tell it that the
+	# lower limit of the graph is '0', and that 1k=1000 (not 1024)
+	echo 'graph_args --base 1000 -l 0'
+	# The Y-axis label
+	echo 'graph_vlabel connections'
+	# We want Cur/Min/Avg/Max unscaled (i.e. 0.42 load instead of
+	# 420 milliload)
+	#echo 'graph_scale no'
+	echo 'graph_category RabbitMQ'
+
+	echo "connections.label Connections"
+	echo "connections.warning $CONN_WARN"
+	echo "connections.critical $CONN_CRIT"
+	echo "connections.info Number of active connections"
+
+	echo 'graph_info Shows the number of connections to RabbitMQ'
+	# Last, if run with the "config"-parameter, quit here (don't
+	# display any data)
+	exit 0
+fi
+
+# If not run with any parameters at all (or only unknown ones), do the
+# real work - i.e. display the data. Almost always this will be
+# "value" subfield for every data field.
+
+echo "connections.value $(HOME=$HOME rabbitmqctl list_connections | grep -v "^Listing" | grep -v "done.$" | wc -l)"
diff --git a/rabbitmq/handlers/main.yml b/rabbitmq/handlers/main.yml
index 4163ca25..9f73baa6 100644
--- a/rabbitmq/handlers/main.yml
+++ b/rabbitmq/handlers/main.yml
@@ -4,8 +4,12 @@
     name: rabbitmq-server
     state: restarted
 
-
 - name: restart nagios-nrpe-server
   service:
     name: nagios-nrpe-server
     state: restarted
+
+- name: restart munin-node
+  service:
+    name: munin-node
+    state: restarted
diff --git a/rabbitmq/tasks/main.yml b/rabbitmq/tasks/main.yml
index 0002ed26..b251276d 100644
--- a/rabbitmq/tasks/main.yml
+++ b/rabbitmq/tasks/main.yml
@@ -38,3 +38,14 @@
 
 - include: nrpe.yml
   when: nrpe_evolix_config.stat.exists
+
+- name: is Munin present ?
+  stat:
+    path: /etc/munin
+  check_mode: no
+  register: etc_munin_directory
+  tags:
+    - nrpe
+
+- include: munin.yml
+  when: etc_munin_directory.stat.exists
diff --git a/rabbitmq/tasks/munin.yml b/rabbitmq/tasks/munin.yml
new file mode 100644
index 00000000..1b410d37
--- /dev/null
+++ b/rabbitmq/tasks/munin.yml
@@ -0,0 +1,45 @@
+---
+
+- include_role:
+    name: remount-usr
+  tags:
+    - rabbitmq
+    - munin
+
+- name: Create local munin directory
+  file:
+    name: /usr/local/share/munin/
+    state: directory
+    mode: "0755"
+  tags:
+    - rabbitmq
+    - munin
+
+- name: Create local plugins directory
+  file:
+    name: /usr/local/share/munin/plugins/
+    state: directory
+    mode: "0755"
+  tags:
+    - rabbitmq
+    - munin
+
+- name: Copy rabbitmq_connections munin plugin
+  copy:
+    src: rabbitmq_connections
+    dest: /usr/local/share/munin/plugins/rabbitmq_connections
+    mode: "0755"
+  notify: restart munin-node
+  tags:
+    - rabbitmq
+    - munin
+
+- name: Enable rabbitmq_connections munin plugin
+  file:
+    src: /usr/local/share/munin/plugins/rabbitmq_connections
+    dest: "/etc/munin/plugins/rabbitmq_connections"
+    state: link
+  notify: restart munin-node
+  tags:
+    - rabbitmq
+    - munin