diff --git a/setup/start/collectd/collectd.conf b/setup/start/collectd/collectd.conf
index 4990bc5ce..fa531d23f 100644
--- a/setup/start/collectd/collectd.conf
+++ b/setup/start/collectd/collectd.conf
@@ -240,8 +240,12 @@ LoadPlugin write_graphite
     Interactive false
 
     Import "df"
-    # <Module df>
-    # </Module>
+
+    Import "du"
+    <Module du>
+        Path boxdata "/home/yellowtent/boxdata"
+        Path platformdata "/home/yellowtent/platformdata"
+    </Module>
 </Plugin>
 
 <Plugin write_graphite>
diff --git a/setup/start/collectd/df.py b/setup/start/collectd/df.py
index b0e4d45e5..23f3f7e98 100644
--- a/setup/start/collectd/df.py
+++ b/setup/start/collectd/df.py
@@ -21,6 +21,7 @@ def read():
         except:
             continue
 
+        # type comes from https://github.com/collectd/collectd/blob/master/src/types.db
         val = collectd.Values(type='df_complex', plugin='df', plugin_instance=instance)
 
         free = st.f_bavail * st.f_frsize # bavail is for non-root user. bfree is total
diff --git a/setup/start/collectd/du.py b/setup/start/collectd/du.py
new file mode 100644
index 000000000..cebff1aef
--- /dev/null
+++ b/setup/start/collectd/du.py
@@ -0,0 +1,42 @@
+import collectd,os,subprocess
+
+# https://www.programcreek.com/python/example/106897/collectd.register_read
+
+PATHS = []
+INTERVAL = 60 * 60 * 24
+
+def du(path):
+    return subprocess.check_output(['du','-Dsb', path]).split()[0].decode('utf-8')
+
+def init():
+    global PATHS
+    collectd.info('custom du plugin initialized with %s' % PATHS)
+
+# configure is called for each module block
+def configure(config):
+    global PATHS
+
+    for node in config.children:
+        key = node.key
+
+        if key == 'Path':
+            PATHS.append({ 'name': node.values[0], 'path': node.values[1] })
+            collectd.info('du plugin: monitoring %s' % node.values[1])
+        else:
+            collectd.info('du plugin: Unknown config key "%s"' % key)
+
+def read():
+    for p in PATHS:
+        path = p['path']
+        collectd.info('computing size of %s' % path)
+        size = du(path)
+        collectd.info('du plugin: size of %s is %s' % (path, size))
+
+        # type comes from https://github.com/collectd/collectd/blob/master/src/types.db
+        val = collectd.Values(type='capacity', plugin='du', plugin_instance=p['name'])
+
+        val.dispatch(values=[size], type_instance='usage')
+
+collectd.register_init(init)
+collectd.register_config(configure)
+collectd.register_read(read, INTERVAL)
diff --git a/src/apptask.js b/src/apptask.js
index cc9db4b5a..a8c82f9d5 100644
--- a/src/apptask.js
+++ b/src/apptask.js
@@ -205,7 +205,7 @@ function addCollectdProfile(app, callback) {
     assert.strictEqual(typeof app, 'object');
     assert.strictEqual(typeof callback, 'function');
 
-    var collectdConf = ejs.render(COLLECTD_CONFIG_EJS, { appId: app.id, containerId: app.containerId });
+    var collectdConf = ejs.render(COLLECTD_CONFIG_EJS, { appId: app.id, containerId: app.containerId, appDataDir: apps.getDataDir(app, app.dataDir) });
     fs.writeFile(path.join(paths.COLLECTD_APPCONFIG_DIR, app.id + '.conf'), collectdConf, function (error) {
         if (error) return callback(error);
         shell.sudo('addCollectdProfile', [ CONFIGURE_COLLECTD_CMD, 'add', app.id ], {}, callback);
diff --git a/src/collectd.config.ejs b/src/collectd.config.ejs
index a3ffc0b16..2d72edab0 100644
--- a/src/collectd.config.ejs
+++ b/src/collectd.config.ejs
@@ -30,3 +30,10 @@ LoadPlugin "table"
     </Result>
   </Table>
 </Plugin>
+
+<Plugin python>
+  <Module du>
+    Path "<%= appId %>" "<%= appDataDir %>"
+  </Module>
+</Plugin>
+