OpenStack Ceilometer basics

The Ceilometer

Ceilometer - OpenStack Telemetry

OpenStack uses Ceilometer to measure Cloud usage.

Telemetry is nice, as infrastructure utilization gets visible to users, developers, project leaders, management and to the IT department for utilization and budgetary purposes.

Telemetry for OpenStack

Getting telemetry from OpenStack quickly changed from optimism to frustration. OpenStack has all of these really nice APIs you can use to query all kinds of information, but there is no mature project for setting it in a system - and we really do not want to start writing a Cloud accounting system from scratch.

Simple start - the API

How to utilize the API could be better documented. Let's walk through the basics.

First you need to get a token:

. openrc    # openrc sets a number of useful variables

Get and store the adminURL in the ADMIN_URL variable (using quick and dirty method):

ADMIN_URL=`curl -s -X POST $OS_AUTH_URL/tokens -H "Content-Type: application/json" -d '{"auth": {"tenantName": "'"$OS_TENANT_NAME"'", "passwordCredentials": {"username": "'"$OS_USERNAME"'", "password": "'"$OS_PASSWORD"'"}}}' | python -c 'import sys, json; print json.load(sys.stdin)["access"]["serviceCatalog"][3]["endpoints"][0]["adminURL"]'`v$OS_VOLUME_API_VERSION/

TOKEN=`curl -s -X POST $OS_AUTH_URL/tokens -H "Content-Type: application/json" -d '{"auth": {"tenantName": "'"$OS_TENANT_NAME"'", "passwordCredentials": {"username": "'"$OS_USERNAME"'", "password": "'"$OS_PASSWORD"'"}}}' | python -c 'import sys, json; print json.load(sys.stdin)["access"]["token"]["id"]'`

echo $TOKEN

Please note that the tests below will not output anything useful if you have a newly installed OpenStack/Devstack with no data / instances in the database.

Run a quick test listing of available meters:

curl -H X-Auth-Token:$TOKEN "${ADMIN_URL}meters" | python -m json.tool|grep name|head -3
        "name": "network.incoming.packets",
        "name": "network.outgoing.bytes",
        "name": "network.outgoing.packets",

Query the list of instances:

curl -H X-Auth-Token:$TOKEN "${ADMIN_URL}meters/instance?q.field=metadata.event_type&q.value=compute.instance.exists" | python -m json.tool | head
        "counter_name": "instance",
        "counter_type": "gauge",
        "counter_unit": "instance",
        "counter_volume": 1.0,
        "message_id": "132e401a-26e2-11e5-8ca8-fef0e2547b3a",
        "project_id": "08b96944c51e45cc847b2a1901ec58c0",
        "recorded_at": "2015-07-10T09:00:13.117000",
        "resource_id": "ca3a8684-f406-464d-8ae4-10982613db0e",

Query the list of instances where timestamp is newer than a date:

curl -X GET -H X-Auth-Token:$TOKEN -H "Content-Type: application/json" -d '{"q": [{"field": "timestamp", "op": "ge", "value": "2014-04-01T13:34:17"}]}' ${ADMIN_URL}meters/instance | python -m json.tool
<the same as above>

A last example to help you along:

curl -X GET -H X-Auth-Token:$TOKEN -H "Content-Type: application/json" -d '{"q": [{"field": "timestamp", "op": "ge", "value": "2014-04-01T13:34:17"}, {"field": "resource_id", "op": "eq", "value": "82a1371d-a1a3-4f98-9781-8663b262ee7e"}]}' ${ADMIN_URL}meters/instance

See this link for examples of how to use the API:

Command line clients

See OpenStack command-line clients for detail on how to install command line clients and getting credentials:

nova image-list
nova flavor-list

In need of a Ceilometer project to contribute to

We master the basics. How to find an OpenStack Ceilometer project to adapt and contribute to?