While waiting for the Ceilometer project to be ready, nova provides some facilities to retrieve simple statistics. A little overview about the available commands.
You will probably notice that some commands are redundant…
I. Host
In Openstack, a host is the machine hosting your services, it can be virtualized but generally for real deployment we have bare metal servers.
I.1. Describe
$ nova host-list
+------------------+-------------+
| host_name | service |
+------------------+-------------+
| c2-compute-01 | compute |
| c2-compute-01 | network |
| c2-compute-02 | compute |
| c2-compute-02 | network |
| c2-compute-03 | compute |
| c2-compute-03 | network |
| c2-compute-04 | compute |
| c2-compute-04 | network |
| c2-controller-01 | cert |
| c2-controller-01 | consoleauth |
| c2-controller-01 | scheduler |
+------------------+-------------+
$ nova host-describe c2-compute-01
+---------------+----------------------------------+-----+-----------+---------+
| HOST | PROJECT | cpu | memory_mb | disk_gb |
+---------------+----------------------------------+-----+-----------+---------+
| c2-compute-01 | (total) | 24 | 96677 | 492 |
| c2-compute-01 | (used_max) | 2 | 2560 | 0 |
| c2-compute-01 | (used_now) | 4 | 7168 | 0 |
| c2-compute-01 | f34d8f7170034280a42f6318d1a4af34 | 2 | 2560 | 0 |
+---------------+----------------------------------+-----+-----------+---------+
II. Server
In Openstack, a server is a virtual machine.
II.1. Diagnostic
The nova command line provides some useful options:
$ nova diagnostics ubuntu
+------------------+---------------+
| Property | Value |
+------------------+---------------+
| cpu0_time | 1138410000000 |
| memory | 524288 |
| memory-actual | 524288 |
| memory-rss | 591664 |
| vda_errors | -1 |
| vda_read | 334864384 |
| vda_read_req | 13851 |
| vda_write | 2985382912 |
| vda_write_req | 177180 |
| vnet4_rx | 45381339 |
| vnet4_rx_drop | 0 |
| vnet4_rx_errors | 0 |
| vnet4_rx_packets | 106426 |
| vnet4_tx | 37513574 |
| vnet4_tx_drop | 0 |
| vnet4_tx_errors | 0 |
| vnet4_tx_packets | 162200 |
+------------------+---------------+
General usage per tenant:
$ nova usage-list
Usage from 2012-10-10 to 2012-11-08:
+----------------------------------+-----------+--------------+-----------+---------------+
| Tenant ID | Instances | RAM MB-Hours | CPU Hours | Disk GB-Hours |
+----------------------------------+-----------+--------------+-----------+---------------+
| 0eec5c34a7a24a7a8ddad27cb81d2706 | 8 | 240031.10 | 468.81 | 0.00 |
| 92a5d9c313424537b78ae3e42858fd4e | 5 | 483568.64 | 236.12 | 0.00 |
| f34d8f7170034280a42f6318d1a4af34 | 106 | 16888511.58 | 9182.88 | 0.00 |
+----------------------------------+-----------+--------------+-----------+---------------+
Nova manage reports the same informationa as the nova API:
$ sudo nova-manage service describe_resource --host=c2-compute-01
HOST PROJECT cpu mem(mb) hdd
c2-compute-01 (total) 24 96677 492
c2-compute-01 (used_now) 6 11264 0
c2-compute-01 (used_max) 6 10752 0
c2-compute-01 f34d8f7170034280a42f6318d1a4af34 6 10752 0
It’s not much but it’s something… As usual, I hope it helps! :-)