CODEWITHSUNDEEP
amazon-web-servicesamazon-cloudwatchamazon-vpc
Naveen Kerati
Naveen Kerati

Reputation: 971

VPN metrics in Cloudwatch

Recently I have configured the ALARM in Cloudwatch for tracking VPN Tunnel connection. It is well known that 0 indicates tunnel is DOWN and 1 indicates tunnel is UP. When Connection is down, I have seen some data points on the graph shown as 0.66, 0.75.

So what does that mean, is the connection is DOWN or UP?

Upvotes: 1

Views: 548

Answers (2)

Rodrigo Murillo
Rodrigo Murillo

Reputation: 13640

The correct statistic for each metric depends on your use case, and the underling metric.

From CloudWatch Concepts - Statistics

Statistics are metric data aggregations over specified periods of time. CloudWatch provides statistics based on the metric data points provided by your custom data or provided by other AWS services to CloudWatch. Aggregations are made using the namespace, metric name, dimensions, and the data point unit of measure, within the time period you specify. The following table describes the available statistics.

Given the VPN metric above, try using the Maximum or Minimum statistics for the alarm. You are using the Average statistic, which, as you noted, will not produce meaningful data for your use case.

  • Minimum
    The lowest value observed during the specified period. You can use this value to determine low volumes of activity for your application.
  • Maximum
    The highest value observed during the specified period. You can use this value to determine high volumes of activity for your application.

Upvotes: 2

Mahdi
Mahdi

Reputation: 3349

That happens if your graph shows averages (that is why both of your values are between 1 and 0). In the ClouWatch console select your metric and then click on the Graphed metrics tab. There you will see Statistics column which is most likely set to Average now.

Upvotes: 0

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