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我使用 cloudformation 为我的服务设置了一堆 cloudwatch 警报。除 ELB 警报外,我的所有警报都有效。它们总是显示数据不足。我可以进入控制台并手动设置警报,但我希望能够使用 cloudformation 模板来创建所有内容。我的警报 json 中一定有错误。以下是其中之一:
"ELBHighLatencyAlarm": {
"Type": "AWS::CloudWatch::Alarm",
"Properties": {
"Namespace": "AWS/ELB",
"AlarmName": { "Fn::Join" : ["", [ { "Ref" : "AWS::StackName"}, "-ELB-ELBHighLatencyAlarm"]]},
"AlarmDescription": { "Fn::Join" : ["", [ { "Ref" : "AWS::StackName"}, "-ELB-ELBHighLatencyAlarm"]]},
"ComparisonOperator": "GreaterThanThreshold",
"Threshold": "0.5",
"EvaluationPeriods": "1",
"Period": "300",
"MetricName": "Latency",
"Statistic": "Average",
"OKActions": [],
"AlarmActions": [ { "Ref": "PagerDutySNSTopicArn" } ],
"InsufficientDataActions": [ { "Ref": "PagerDutySNSTopicArn" } ],
"Dimensions": [ {
"Name": "ElasticLoadBalancer",
"Value": { "Ref": "WebServerLoadBalancer" }
}]
}
}
你觉得它有什么问题吗?
答案1
您的"Dimensions"
部分未使用正确的"Name"
值。如果您替换:
"Dimensions": [ {
"Name": "ElasticLoadBalancer",
"Value": { "Ref": "WebServerLoadBalancer" }
}]
和
"Dimensions": [ {
"Name": "LoadBalancerName",
"Value": { "Ref": "WebServerLoadBalancer" }
}]
你会发现你的闹钟会起作用。
答案2
我可以证实 Dojo 上面所说的话。尽管维度块描述中的措辞看起来好像它不是必需的,并且字符串/值是任意的,但对于您要为其创建警报的每种服务类型,都有一个特定的名称列表。此列表将服务类型映射到维度块中允许的值,从而使您的警报正常工作。
在我看来,dimensions 块是一种过滤事件的方式。因此,如果您想要查看集群的 CPUUtilization,则需要提供 ClusterName。如果您想要查看集群的特定服务,则需要向 Dimensions 块提供 2 个条目。ClusterName 和 ServiceName。
http://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/ecs-metricscollected.html
以下两个示例之间的唯一区别是 Dimensions.Name 字段。
例如不是工作
"CPUUtilizationScaleInAlarm": {
"Type": "AWS::CloudWatch::Alarm",
"Properties": {
"ActionsEnabled": true,
"AlarmActions": [
{
"Ref": "ESCServiceScaleInPolicy"
}
],
"AlarmDescription": "Scale in in response to CPUUtilization being low",
"AlarmName": "CPUUtilizationScaleIn",
"ComparisonOperator": "LessThanOrEqualToThreshold",
"Dimensions": [
{
"Name": "ECService",
"Value": "MyAwesomeService"
],
"EvaluationPeriods": 1,
"MetricName": "CPUUtilization",
"Namespace": "AWS/ECS",
"Period": 60,
"Statistic": "Average",
"Threshold": 25,
"Unit": "Percent"
}
}
例如将要工作
"CPUUtilizationScaleInAlarm": {
"Type": "AWS::CloudWatch::Alarm",
"Properties": {
"ActionsEnabled": true,
"AlarmActions": [
{
"Ref": "ESCServiceScaleInPolicy"
}
],
"AlarmDescription": "Scale in in response to CPUUtilization being low",
"AlarmName": "CPUUtilizationScaleIn",
"ComparisonOperator": "LessThanOrEqualToThreshold",
"Dimensions": [
{
"Name": "ServiceName",
"Value": "MyAwesomeService"
],
"EvaluationPeriods": 1,
"MetricName": "CPUUtilization",
"Namespace": "AWS/ECS",
"Period": 60,
"Statistic": "Average",
"Threshold": 25,
"Unit": "Percent"
}
}