With the continuous development of cloud computing technology, more and more enterprises begin to use OpenStack to build a private cloud or public cloud platform. Cloud platform is gradually replacing the traditional server, to undertake the enterprises and user IT business. In order to guarantee the service quality of the cloud platform, this article designs the interactive operation page of monitoring and alarming function for the virtual machine of cloud platform, based on the OpenStack alarm function interface--Ceilometer Alarm API. Using this function, users can monitor the running state of the virtual machine, ensuring the reliable operation of the cloud platform.