5.2. 创建警报
您可以使用 aodh 创建在达到阈值时激活的警报。在本例中，警报激活并在单个实例的平均 CPU 利用率超过 80% 时添加一个日志条目。
流程
创建警报并使用查询来隔离实例的特定 ID (94619081-abf5-4f1f-81c7-9cedaa872403)以进行监控：
# openstack alarm create --type gnocchi_aggregation_by_resources_threshold --name cpu_usage_high --metric cpu_util --threshold 80 --aggregation-method sum --resource-type instance --query '{"=": {"id": "94619081-abf5-4f1f-81c7-9cedaa872403"}}' --alarm-action 'log://' +---------------------------+-------------------------------------------------------+ | Field | Value | +---------------------------+-------------------------------------------------------+ | aggregation_method | sum | | alarm_actions | [u'log://'] | | alarm_id | b794adc7-ed4f-4edb-ace4-88cbe4674a94 | | comparison_operator | eq | | description | gnocchi_aggregation_by_resources_threshold alarm rule | | enabled | True | | evaluation_periods | 1 | | granularity | 60 | | insufficient_data_actions | [] | | metric | cpu_util | | name | cpu_usage_high | | ok_actions | [] | | project_id | 13c52c41e0e543d9841a3e761f981c20 | | query | {"=": {"id": "94619081-abf5-4f1f-81c7-9cedaa872403"}} | | repeat_actions | False | | resource_type | instance | | severity | low | | state | insufficient data | | state_timestamp | 2016-12-09T05:18:53.326000 | | threshold | 80.0 | | time_constraints | [] | | timestamp | 2016-12-09T05:18:53.326000 | | type | gnocchi_aggregation_by_resources_threshold | | user_id | 32d3f2c9a234423cb52fb69d3741dbbc | +---------------------------+-------------------------------------------------------+若要编辑现有阈值警报，可使用 aodh alarm update 命令。例如，要将警报阈值增加到 75%，请使用以下命令：
# openstack alarm update --name cpu_usage_high --threshold 75
