我使用 AWS CloudFormation 或 AWS 命令行界面 (AWS CLI) 在 Amazon CloudWatch 中创建了 Canary。Canary 在一段时间后自动停止运行。该如何排查此问题?
解决方法
**注意:**如果在运行 AWS CLI 命令时收到错误,请确保您使用的是最新版本的 AWS CLI。
如果 CloudWatch Canary 停止运行,请检查您在创建 Canary 时设置的“DurationInSeconds”值。该值指定 Canary 根据“Expression”值中的计划持续进行常规运行的时长(以秒为单位)。如果指定 0,Canary 将一直运行到您将其停止为止。如果省略此字段,则将使用默认值 0。
若要查看 Canary 的“DurationInSeconds”参数,请运行 Amazon CloudWatch Synthetics GetCanary API:
aws synthetics get-canary --name [canary_name]
在输出中查看“DurationInSeconds”的值:
{
"Canary": {
"Id": "a1495b85-1c60-4f29-92c1-540f62fa34e3",
"Name": "canary_name",
"Code": {
"SourceLocationArn": "arn:aws:lambda:eu-west-1:YourAccount:layer:cwsyn-canary_name-a1495b85-1c60-4f29-92c1-540f62fa34e3:1",
"Handler": "CanaryFunction.handler"
},
"ExecutionRoleArn": "arn:aws:iam::YourAccount:role/CanaryRoleName",
"Schedule": {
"Expression": "rate(2 minutes)",
"DurationInSeconds": 360
},
"RunConfig": {
"TimeoutInSeconds": 120
},
"SuccessRetentionPeriodInDays": 31,
"FailureRetentionPeriodInDays": 31,
"Status": {
"State": "READY"
},
"Timeline": {
"Created": 1594481063.96,
"LastModified": 1594481063.96
},
"ArtifactS3Location": "S3_Bucket_for_artifacts",
"EngineArn": "arn:aws:lambda:eu-west-1:YourAccount:function:cwsyn-canary_name-a1495b85-1c60-4f29-92c1-540f62fa34e3:1",
"RuntimeVersion": "syn-1.0",
"Tags": {}
}
}
**注意:**在响应中,“DurationInSeconds”不等于 0。
如果“DurationInSeconds”值与您的预期持续时间不符,请运行 CloudWatch Synthetics UpdateCanary API:
aws synthetics update-canary --name canary_cli --schedule Expression="rate(2 minutes)",DurationInSeconds=0
**注意:**要使 Canary 持续运行,您必须编写“DurationInSeconds”设置为 0 的计划表达式。
若要验证您的更改,请使用 AWS CLI 运行 CloudWatch Synthetics get-canary 命令:
aws synthetics get-canary --name [canary_name]
{
"Canary": {
"Id": "a1495b85-1c60-4f29-92c1-540f62fa34e3",
"Name": "canary_name",
"Code": {
"SourceLocationArn": "arn:aws:lambda:eu-west-1:YourAccount:layer:cwsyn-canary_name-a1495b85-1c60-4f29-92c1-540f62fa34e3:1",
"Handler": "CanaryFunction.handler"
},
"ExecutionRoleArn": "arn:aws:iam::YourAccount:role/CanaryRoleName",
"Schedule": {
"Expression": "rate(2 minutes)",
"DurationInSeconds": 0
},
"RunConfig": {
"TimeoutInSeconds": 120
},
"SuccessRetentionPeriodInDays": 31,
"FailureRetentionPeriodInDays": 31,
"Status": {
"State": "READY"
},
"Timeline": {
"Created": 1594481063.96,
"LastModified": 1594481063.96
},
"ArtifactS3Location": "S3_Bucket_for_artifacts",
"EngineArn": "arn:aws:lambda:eu-west-1:YourAccount:function:cwsyn-canary_name-a1495b85-1c60-4f29-92c1-540f62fa34e3:1",
"RuntimeVersion": "syn-1.0",
"Tags": {}
}
}
在输出中确认“DurationInSeconds”的值为 0。