From 18d192a0b455a06baa03b76f87f4e97cad6c1a3f Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Sat, 14 Mar 2015 15:29:46 +0000
Subject: [PATCH] Switch to generating munin graphs on demand

---
 cookbooks/munin/recipes/server.rb                |  4 ++++
 cookbooks/munin/templates/default/apache.erb     | 10 ++++++++++
 cookbooks/munin/templates/default/munin.conf.erb |  8 ++++++++
 3 files changed, 22 insertions(+)

diff --git a/cookbooks/munin/recipes/server.rb b/cookbooks/munin/recipes/server.rb
index 3e72ea160..84c739e49 100644
--- a/cookbooks/munin/recipes/server.rb
+++ b/cookbooks/munin/recipes/server.rb
@@ -21,6 +21,7 @@ include_recipe "apache"
 
 package "munin"
 package "rrdcached"
+package "libcgi-fast-perl"
 
 template "/etc/default/rrdcached" do
   source "rrdcached.erb"
@@ -62,6 +63,9 @@ template "/etc/munin/munin.conf" do
   variables :expiry_time => expiry_time, :clients => clients, :frontends => frontends, :backends => backends, :tilecaches => tilecaches, :renderers => renderers
 end
 
+apache_module "fcgid"
+apache_module "rewrite"
+
 apache_site "munin.openstreetmap.org" do
   template "apache.erb"
 end
diff --git a/cookbooks/munin/templates/default/apache.erb b/cookbooks/munin/templates/default/apache.erb
index 59598acab..aaf8b5c90 100644
--- a/cookbooks/munin/templates/default/apache.erb
+++ b/cookbooks/munin/templates/default/apache.erb
@@ -9,8 +9,18 @@
 	ErrorLog /var/log/apache2/munin.openstreetmap.org-error.log
 
 	DocumentRoot /var/cache/munin/www
+	ScriptAlias /munin-cgi/ /usr/lib/munin/cgi/
+
+	RewriteEngine on
+	RewriteRule ^(/.*\.html)?$ /munin-cgi/munin-cgi-html/$1 [PT]
 </VirtualHost>
 
 <Directory /var/cache/munin/www>
 	Require all granted
 </Directory>
+
+<Directory /usr/lib/munin/cgi>
+	Options +ExecCGI
+	SetHandler fcgid-script
+	Require all granted
+</Directory>
diff --git a/cookbooks/munin/templates/default/munin.conf.erb b/cookbooks/munin/templates/default/munin.conf.erb
index 71484c237..c560717a0 100644
--- a/cookbooks/munin/templates/default/munin.conf.erb
+++ b/cookbooks/munin/templates/default/munin.conf.erb
@@ -3,6 +3,14 @@
 # Set maximum number of update processes to run at once
 max_processes 64
 
+# Maximum number of graphs to generate at once
+max_graph_jobs 24
+max_cgi_graph_jobs 24
+
+# Render pages and graphs on demand
+html_strategy cgi
+graph_strategy cgi
+
 # Use rrdcached
 rrdcached_socket /var/run/rrdcached.sock
 
-- 
2.43.2