Show usage statistics for hosts and instancesYou can show basic
statistics on resource usage for hosts and instances.For more sophisticated
monitoring, see the Ceilometer project, which is under
development. You can also use tools, such as Ganglia or
Graphite, to gather more detailed data.To show host usage statisticsList the hosts and the nova-related services that run on
them:$nova host-list+------------------+-------------+----------+
| host_name | service | zone |
+------------------+-------------+----------+
| devstack-grizzly | conductor | internal |
| devstack-grizzly | compute | nova |
| devstack-grizzly | cert | internal |
| devstack-grizzly | network | internal |
| devstack-grizzly | scheduler | internal |
| devstack-grizzly | consoleauth | internal |
+------------------+-------------+----------+Get a summary of resource usage of all of the instances running
on the host.$nova host-describe devstack-grizzly+------------------+----------------------------------+-----+-----------+---------+
| HOST | PROJECT | cpu | memory_mb | disk_gb |
+------------------+----------------------------------+-----+-----------+---------+
| devstack-grizzly | (total) | 2 | 4003 | 157 |
| devstack-grizzly | (used_now) | 3 | 5120 | 40 |
| devstack-grizzly | (used_max) | 3 | 4608 | 40 |
| devstack-grizzly | b70d90d65e464582b6b2161cf3603ced | 1 | 512 | 0 |
| devstack-grizzly | 66265572db174a7aa66eba661f58eb9e | 2 | 4096 | 40 |
+------------------+----------------------------------+-----+-----------+---------+The cpu column shows the sum of
the virtual CPUs for instances running on the host.The memory_mb column shows the
sum of the memory (in MB) allocated to the instances
that run on the hosts.The disk_gb column shows the sum
of the root and ephemeral disk sizes (in GB) of the
instances that run on the hosts.These values are computed by using only information
about the flavors of the instances that run on the
hosts. This command does not query the CPU usage,
memory usage, or hard disk usage of the physical
host.To show instance usage statisticsGet CPU, memory, I/O, and network statistics for an
instance.First, list instances:$nova list+--------------------------------------+----------------------+--------+------------+-------------+------------------+
| ID | Name | Status | Task State | Power State | Networks |
+--------------------------------------+----------------------+--------+------------+-------------+------------------+
| 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5 | myCirrosServer | ACTIVE | None | Running | private=10.0.0.3 |
| 8a99547e-7385-4ad1-ae50-4ecfaaad5f42 | myInstanceFromVolume | ACTIVE | None | Running | private=10.0.0.4 |
+--------------------------------------+----------------------+--------+------------+-------------+------------------+Then, get diagnostic statistics:$nova diagnostics myCirrosServer+------------------+----------------+
| Property | Value |
+------------------+----------------+
| vnet1_rx | 1210744 |
| cpu0_time | 19624610000000 |
| vda_read | 0 |
| vda_write | 0 |
| vda_write_req | 0 |
| vnet1_tx | 863734 |
| vnet1_tx_errors | 0 |
| vnet1_rx_drop | 0 |
| vnet1_tx_packets | 3855 |
| vnet1_tx_drop | 0 |
| vnet1_rx_errors | 0 |
| memory | 2097152 |
| vnet1_rx_packets | 5485 |
| vda_read_req | 0 |
| vda_errors | -1 |
+------------------+----------------+Get summary statistics for each tenant:$nova usage-listUsage from 2013-06-25 to 2013-07-24:
+----------------------------------+-----------+--------------+-----------+---------------+
| Tenant ID | Instances | RAM MB-Hours | CPU Hours | Disk GB-Hours |
+----------------------------------+-----------+--------------+-----------+---------------+
| b70d90d65e464582b6b2161cf3603ced | 1 | 344064.44 | 672.00 | 0.00 |
| 66265572db174a7aa66eba661f58eb9e | 3 | 671626.76 | 327.94 | 6558.86 |
+----------------------------------+-----------+--------------+-----------+---------------+