From 4f2e1d7b8d21f1752b7d0c49f8e9ecf4fb3dd1d7 Mon Sep 17 00:00:00 2001
From: Niklas Yann Wettengel <niyawe@niyawe.de>
Date: Sat, 11 Sep 2021 14:56:47 +0200
Subject: [PATCH] munin wg peers

---
 .../files/munin/munin_wg_conf                 |  3 ++
 .../files/munin/munin_wg_peers                | 54 +++++++++++++++++++
 .../tasks/install_munin.yml                   | 25 +++++++++
 3 files changed, 82 insertions(+)
 create mode 100644 roles/install_monitoring/files/munin/munin_wg_conf
 create mode 100755 roles/install_monitoring/files/munin/munin_wg_peers

diff --git a/roles/install_monitoring/files/munin/munin_wg_conf b/roles/install_monitoring/files/munin/munin_wg_conf
new file mode 100644
index 0000000..6bf6e8d
--- /dev/null
+++ b/roles/install_monitoring/files/munin/munin_wg_conf
@@ -0,0 +1,3 @@
+[wg_peers_*]
+user root
+group root
diff --git a/roles/install_monitoring/files/munin/munin_wg_peers b/roles/install_monitoring/files/munin/munin_wg_peers
new file mode 100755
index 0000000..8aa9b87
--- /dev/null
+++ b/roles/install_monitoring/files/munin/munin_wg_peers
@@ -0,0 +1,54 @@
+#!/bin/sh
+# -*- sh -*-
+
+: << =cut
+
+=head1 NAME
+
+wg_peers_ - Plugin to monitor wg peers
+
+=head1 CONFIGURATION
+
+Set user and group to have access
+
+    [wg_peers_*]
+    user root
+    group root
+
+=head1 USAGE
+
+Link this plugin to /etc/munin/plugins/
+
+After creating the links, restart munin-node. Don't forget to configure the plugin!
+
+=head1 AUTHORS
+
+Niklas Yann Wettengel <niyawe@niyawe.de>
+
+=head1 LICENSE
+
+GPLv2
+
+=head1 MAGIC MARKERS
+
+ #%# family=manual
+
+=cut
+
+. "$MUNIN_LIBDIR/plugins/plugin.sh"
+
+myname=$(basename "$0" | sed 's/^wg_peers_//g')
+
+if [ "$1" = "config" ]; then
+	echo "graph_title wg${myname} peers"
+	echo "graph_info This graph shows the wg peers on this supernode"
+	echo "graph_args -l 0"
+	echo "graph_scale no"
+	echo "graph_vlabel peers count"
+	echo "graph_category wireguard"
+	echo "peers.label peers"
+	echo "peers.draw AREA"
+	exit 0
+fi
+
+echo "peers.value $(wg show wg${myname} peers | wc -l)"
diff --git a/roles/install_monitoring/tasks/install_munin.yml b/roles/install_monitoring/tasks/install_munin.yml
index 1a35928..0a95622 100644
--- a/roles/install_monitoring/tasks/install_munin.yml
+++ b/roles/install_monitoring/tasks/install_munin.yml
@@ -57,6 +57,31 @@
   notify: restart munin-node
   when: "'fastd' in group_names"
 
+- name: copy wg peers plugin
+  copy:
+      src: munin/munin_wg_peers
+      dest: /usr/lib/munin/plugins/wg_peers_
+      mode: 0755
+  notify: restart munin-node
+  when: "'fastd' in group_names"
+
+- name: copy wg peers plugin config
+  copy:
+      src: munin/munin_wg_conf
+      dest: /etc/munin/plugin-conf.d/wg
+      mode: 0644
+  notify: restart munin-node
+  when: "'fastd' in group_names"
+
+- name: enable munin plugins for wg peers
+  file:
+      path: /etc/munin/plugins/wg_peers_{{ item.name }}
+      src: /usr/lib/munin/plugins/wg_peers_
+      state: link
+  with_items: "{{ sites }}"
+  notify: restart munin-node
+  when: "'fastd' in group_names"
+
 - name: copy dhcp-pool plugin
   copy:
       src: munin/munin_dhcp_pool_plugin