From d6aa4663cf978ed6db3e34c8c7d63dc13b430305 Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Thu, 17 Sep 2015 00:11:20 +0100
Subject: [PATCH] Add munin plugin to monitor chef node status

---
 cookbooks/chef/metadata.rb                    |  1 +
 cookbooks/chef/recipes/server.rb              |  2 ++
 .../munin/files/default/plugin-conf.d/chef    |  2 ++
 .../munin/files/default/plugins/chef_status   | 29 +++++++++++++++++++
 4 files changed, 34 insertions(+)
 create mode 100644 cookbooks/munin/files/default/plugin-conf.d/chef
 create mode 100755 cookbooks/munin/files/default/plugins/chef_status

diff --git a/cookbooks/chef/metadata.rb b/cookbooks/chef/metadata.rb
index 08f2c330e..8db6f1bb9 100644
--- a/cookbooks/chef/metadata.rb
+++ b/cookbooks/chef/metadata.rb
@@ -9,3 +9,4 @@ depends           "apache"
 depends           "apt"
 depends           "git"
 depends           "ohai"
+depends           "munin"
diff --git a/cookbooks/chef/recipes/server.rb b/cookbooks/chef/recipes/server.rb
index 54efa19e5..31e7d1358 100644
--- a/cookbooks/chef/recipes/server.rb
+++ b/cookbooks/chef/recipes/server.rb
@@ -91,3 +91,5 @@ template "/etc/logrotate.d/chef-server" do
   group "root"
   mode 0644
 end
+
+munin_plugin "chef_status"
diff --git a/cookbooks/munin/files/default/plugin-conf.d/chef b/cookbooks/munin/files/default/plugin-conf.d/chef
new file mode 100644
index 000000000..33beeccbc
--- /dev/null
+++ b/cookbooks/munin/files/default/plugin-conf.d/chef
@@ -0,0 +1,2 @@
+[chef_*]
+user chefrepo
diff --git a/cookbooks/munin/files/default/plugins/chef_status b/cookbooks/munin/files/default/plugins/chef_status
new file mode 100755
index 000000000..9d4c742fc
--- /dev/null
+++ b/cookbooks/munin/files/default/plugins/chef_status
@@ -0,0 +1,29 @@
+#!/usr/bin/ruby
+
+require "json"
+
+nodes = JSON.parse(IO.popen(["knife", "status", "-c", "/var/lib/chef/.chef/knife.rb", "-F", "json"]).read).sort_by { |node| node["name"] }
+
+if ARGV[0] == "config"
+  puts "graph_title Chef node status"
+  puts "graph_args --base 1000 --logarithmic"
+  puts "graph_vlabel Time since last checkin"
+  puts "graph_category chef"
+
+  nodes.each do |node|
+    name = node["name"].split(".").first
+
+    puts "#{name}.label #{name}"
+    puts "#{name}.type GAUGE"
+    puts "#{name}.min 0"
+    puts "#{name}.warning 14400"
+    puts "#{name}.critical 43200"
+  end
+else
+  nodes.each do |node|
+    name = node["name"].split(".").first
+    time = Time.now.to_f - node["ohai_time"]
+
+    puts "#{name}.value #{time}"
+  end
+end
-- 
2.39.5