Client/server config with chef

On the client (default.rb in the cookbook)

# Set attribute indicating munin role
node.set["munin"]["node"] = true

# Find available munin servers
available_servers = search(:node, "munin_server:true")


# Install munin plugins
munin_plugin "passenger_memory_stats"
munin_plugin "passenger_status"

cookbook_file "/etc/munin/plugin-conf.d/munin-node" do
  source "plugin-conf.d_munin-node"
  mode "0644"
  notifies :restart, "service[munin-node]"
end

template "/etc/munin/munin-node.conf" do
  source "munin-node.conf.erb"
  mode "0644"
  variables(:munin_servers => available_servers)
  notifies :restart, "service[munin-node]", :immediately
end

On the server (server.rb in cookbook)

munin_clients = search(:node, "munin_node:true")

template "/etc/munin/munin.conf" do
  source "munin.conf.erb"
  mode 0644
  variables(:munin_nodes => munin_clients)
end