Learning AWS by 2015

Author:2015
Language: eng
Format: epub, mobi
Publisher: Packt Publishing

Of: This is the metric we are interested in to monitor and set the alarm against. Select the CPU Utilization, since it's the most logical choice if we want to add or remove instances. The other useful metrics that can be used are network utilization and memory utilization. A list of EC2 metrics collected by cloud watch is available at http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/ec2-metricscollected.html#ec2-metrics.

Is: This defines the metric threshold. In our case, we want to add an instance when the CPU Utilization Percent reaches more than 80 percent. Enter 60 as the threshold value with 20 percent headroom to account for irregular spikes and an instance failing to startup. The threshold percentage is the average of all the instances in the auto scaling group and not any specific instance.

For at least: This is the specified period after which the alarm is triggered. By default, the CloudWatch sampling period is 5 minutes, and is offered free of charge. This is 1 minute as a paid service. The parameter for consecutive period(s) cannot be less than the metric selected for the sampling period. Enter 1 in the For at least column and select 5 Minutes from the period(s) dropdown.

Name of alarm: A name is automatically generated, as shown in the following screenshot:

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