add systemd unit file

miscellaneous/monitor-client.service

+[Unit]
+Description=CIRCLE monitor-client
+After=network.target
+
+[Service]
+User=cloud
+Group=cloud
+WorkingDirectory=/home/cloud/monitor-client
+ExecStart=/bin/bash -c "source /etc/profile; workon monitor-client; exec python manage.py run"
+Restart=always
+
+[Install]
+WantedBy=multi-user.target

src/client.py

@@ -118,8 +118,11 @@ class Client:
             'system.boot_time': psutil.boot_time()
         }
 
-        for k, v in psutil.disk_io_counters().__dict__.items():
-            metrics['disk.%s' % k] = v
+        try:
+            for k, v in psutil.disk_io_counters().__dict__.items():
+                metrics['disk.%s' % k] = v
+        except:
+            pass
 
         interfaces = psutil.network_io_counters(pernic=True)
         for interface, data in interfaces.iteritems():