openstack资源统计监控系列之ceilometer介绍及使用（一）

官方介绍和说明

Ceilometer is a data collection service that collects event and metering data by monitoring notifications sent from OpenStack services. It publishes collected data to various targets including data stores and message queues.

The Ceilometer project is a data collection service that provides the ability to normalise and transform data across all current OpenStack core components with work underway to support future OpenStack components.

Ceilometer is a component of the Telemetry project. Its data can be used to provide customer billing, resource tracking, and alarming capabilities across all OpenStack core components.

Celiometer是OpenStack的计量与监控组件，官方的正式名称为OpenStack Telemetry，用来获取和保存计量与监控的各种测量值，并根据测量值进行报警。同时这些保存下来的测量值也可以被第三方系统获取，用来做更进一步的分析、处理或展示。

ceilometer主要负责监控数据的采集，采集的项目包括虚拟机的性能数据，neutron-l3-router使用的网络带宽，glance&cinder&swift等租户使用信息，甚至是通过snmp采集物理机的信息，