揭密首个面向IaaS的查询语言：ZStack Query Language（ZQL）

这里我们用一条ZQL语句中即返回了我们感兴趣的元数据字段：uuid和hostUuid，也返回了该虚拟机的监控数据。细心的读者已经注意到我们在ZWatch查询字段中指定了参数resultName='webvm-cpu'，并且在返回的JSON map中监控数据的key也是webvm-cpu。跟named as关键字一样，这是为了执行多条ZWatch查询子句时方便检索返回结果准备的。 ZStack UI使用非常复杂的ZQL查询语句，例如在TOP 5页面，一条ZQL查询包含多达13个ZWatch查询：

ZQLQuery zql="query vmInstance.uuid,name where zoneUuid='89e148fb667c404dbc5309a2e956fa28' and hypervisorType='KVM' and type='UserVm' and state='Running' return with (zwatch{resultName='CPUAllUsedUtilization',metricName='CPUAllUsedUtilization',offsetAheadOfCurrentTime=60,period=6,functions='average(groupBy="VMUuid")',functions='top(num=5)'},zwatch{resultName='MemoryUsedInPercent',metricName='MemoryUsedInPercent',offsetAheadOfCurrentTime=60,period=6,functions='average(groupBy="VMUuid")',functions='top(num=5)'},zwatch{resultName='MemoryFreeInPercent',metricName='MemoryFreeInPercent',offsetAheadOfCurrentTime=60,period=6,functions='average(groupBy="VMUuid")',functions='top(num=5)'},zwatch{resultName='DiskAllReadOps',metricName='DiskAllReadOps',offsetAheadOfCurrentTime=60,period=6,functions='average(groupBy="VMUuid")',functions='top(num=5)'},zwatch{resultName='DiskAllWriteOps',metricName='DiskAllWriteOps',offsetAheadOfCurrentTime=60,period=6,functions='average(groupBy="VMUuid")',functions='top(num=5)'},zwatch{resultName='DiskAllReadBytes',metricName='DiskAllReadBytes',offsetAheadOfCurrentTime=60,period=6,functions='average(groupBy="VMUuid")',functions='top(num=5)'},zwatch{resultName='DiskAllWriteBytes',metricName='DiskAllWriteBytes',offsetAheadOfCurrentTime=60,period=6,functions='average(groupBy="VMUuid")',functions='top(num=5)'},zwatch{resultName='NetworkOutBytes',metricName='NetworkOutBytes',offsetAheadOfCurrentTime=60,period=6,functions='average(groupBy="VMUuid,NetworkDeviceLetter")',functions='top(num=5)'},zwatch{resultName='NetworkInBytes',metricName='NetworkInBytes',offsetAheadOfCurrentTime=60,period=6,functions='average(groupBy="VMUuid,NetworkDeviceLetter")',functions='top(num=5)'},zwatch{resultName='NetworkOutPackets',metricName='NetworkOutPackets',offsetAheadOfCurrentTime=60,period=6,functions='average(groupBy="VMUuid,NetworkDeviceLetter")',functions='top(num=5)'},zwatch{resultName='NetworkInPackets',metricName='NetworkInPackets',offsetAheadOfCurrentTime=60,period=6,functions='average(groupBy="VMUuid,NetworkDeviceLetter")',functions='top(num=5)'},zwatch{resultName='NetworkOutErrors',metricName='NetworkOutErrors',offsetAheadOfCurrentTime=60,period=6,functions='average(groupBy="VMUuid,NetworkDeviceLetter")',functions='top(num=5)'},zwatch{resultName='NetworkInErrors',metricName='NetworkInErrors',offsetAheadOfCurrentTime=60,period=6,functions='average(groupBy="VMUuid,NetworkDeviceLetter")',functions='top(num=5)'})"

上例是在ZStack CLI中执行时的例子，使用对引号转义

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