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17
doc/source/agent/writing_agent_plugin.rst
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License for the specific language governing permissions and limitations License for the specific language governing permissions and limitations
under the License. under the License.
This documentation has for objective to give you some clues on how to write a This documentation gives you some clues on how to write a
new agent or plugin for Ceilometer a to use if you wish to instrument a new agent or plugin for Ceilometer a to use if you wish to instrument a
functionality which has not yet been covered by an existing one. functionality which has not yet been covered by an existing one.
An agent runs on each compute node to poll for resource usage. Each metric
collected is tagged with the resource ID (such as an instance) and the owner,
including tenant and user IDs.The metrics are then reported to the collector
via the message bus. More detailed information follows.
Agent Agent
===== =====
There is currently only one agent defined for Ceilometer which can be found at: ``ceilometer/agent/`` There is currently only one agent defined for Ceilometer which can be found at: ``ceilometer/agent/``
As you will see in the ``manager.py`` file, this agent will automatically load any As you will see in the ``manager.py`` file, this agent will automatically load any
plugin defined in the namesace ``ceilometer.poll.compute``. plugin defined in the namespace ``ceilometer.poll.compute``.
Agents are added by implementing a new nova.manager.Manager class, in the same Agents are added by implementing a new nova.manager.Manager class, in the same
way it was done for the AgentManager for the compute agent in the file way it was done for the AgentManager for the compute agent in the file
@ -63,9 +68,9 @@ value of 1.
Note that the ``LOG`` method is only used as a debugging tool and does not Note that the ``LOG`` method is only used as a debugging tool and does not
participate in the actual metering activity. participate in the actual metering activity.
Notification Notifications
------------ -------------
Notifiications are defined as subclass of the ``ceilometer.plugin.NotificationBase`` Notifications are defined as subclass of the ``ceilometer.plugin.NotificationBase``
meta class as defined in the ``ceilometer/plugin.py`` file. Notifications must meta class as defined in the ``ceilometer/plugin.py`` file. Notifications must
implement two methods: implement two methods:
@ -95,5 +100,3 @@ the project, thus ensuring as best as possible that a given patch has no side
effect to the rest of the project. effect to the rest of the project.
### FIXME: could not find a unit test for CPUPollster ### FIXME: could not find a unit test for CPUPollster

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doc/source/index.rst
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Welcome to the Ceilometer developer documentation! Welcome to the Ceilometer developer documentation!
================================================== ==================================================
The ceilometer project aims to deliver a unique point of contact for billing systems to aquire all meters they need to establish customer billing, accross all current and future OpenStack core components. The ceilometer project aims to deliver a unique point of contact for billing
systems to acquire all meters they need to establish customer billing, across
all current OpenStack core components with work underway to support future
OpenStack components through plugin agents.
A list of the current usage data that ceilometer will (eventually) listen for
can be found at http://wiki.openstack.org/SystemUsageData. For a list of the
planned meters, refer to http://wiki.openstack.org/EfficientMetering#Meters.
A list of the additional usage data is tracked in the bug tracker at https://bugs.launchpad.net/ceilometer.
What is the purpose of the project and vision for it? What is the purpose of the project and vision for it?
===================================================== =====================================================
@ -27,12 +36,12 @@ What is the purpose of the project and vision for it?
* Data may be collected by monitoring notifications sent from existing services or by polling the infrastructure. * Data may be collected by monitoring notifications sent from existing services or by polling the infrastructure.
* Allow deployers to configure the type of data collected to meet their operating requirements. * Allow deployers to configure the type of data collected to meet their operating requirements.
* The data collected by the metering system is made visible to some users through a REST API. * The data collected by the metering system is made visible to some users through a REST API.
* The metering messages are signed and non repudiable (http://en.wikipedia.org/wiki/Non-repudiation) * The metering messages are signed and non-repudiable. (http://en.wikipedia.org/wiki/Non-repudiation)
This documentation has for objective to give you some clues on how to contribute code to ceilometer. This documentation offers information on how to contribute code to ceilometer.
Table of content Table of contents
================ =================
.. toctree:: .. toctree::
:maxdepth: 1 :maxdepth: 1

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doc/source/initial_setup.rst
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License for the specific language governing permissions and limitations License for the specific language governing permissions and limitations
under the License. under the License.
Initial reading Initial setup
=============== =============
If you are not yet familiar with ceilometer's architecture, it would If you are not yet familiar with ceilometer's architecture, it would be
be advisable that you start by reading the blueprint_ and more advisable that you start by reading the blueprint at http://wiki.openstack.org/EfficientMetering, and more specifically the architecture which has been agreed on
specifically the architecture_ which has been agreed on. at: http://wiki.openstack.org/EfficientMetering/ArchitectureProposalV1.
.. _architecture: http://wiki.openstack.org/EfficientMetering/ArchitectureProposalV1
.. _blueprint: http://wiki.openstack.org/EfficientMetering
In order to contribute to the ceilometer project, you will also need to: In order to contribute to the ceilometer project, you will also need to:
1. Have signed openstack's contributor's agreement 1. Have signed OpenStack's contributor's agreement. Refer to http://wiki.openstack.org/CLA for more information.
http://wiki.openstack.org/CLA
2. Be familiar with git and the OpenStack gerrit review process 2. Be familiar with git and the OpenStack Gerrit review process, see http://wiki.openstack.org/GerritWorkflow.
http://wiki.openstack.org/GerritWorkflow
.. note::
Currently the ceilometer project is using StackForge, a
system for code reviews identical to the OpenStack contribution infrastructure.
Setting up the project Setting up the project
====================== ======================
1. The first thing you will need to do is to clone the ceilometer project on your local machine: 1. The first thing you will need to do is to clone the ceilometer project on your local machine::
git clone https://github.com/stackforge/ceilometer.git git clone https://github.com/stackforge/ceilometer.git
2. Once this is done, you need to setup the review process: 2. Once this is done, you need to setup the review process::
git remote add gerrit ssh://<username>@review.stackforge.org:29418/stackforge/ceilometer.git git remote add gerrit ssh://<username>@review.stackforge.org:29418/stackforge/ceilometer.git
3. Create a topic branch and switch to it 3. Create a topic branch and switch to it::
git checkout -b TOPIC-BRANCH
git checkout -b TOPIC-BRANCH