How to create custom CloudWatch memory metrics for ubuntu EC2 instance?

by XDK 28. September 2019 01:39

Explanation:

Launch an EC2 instance for which the custom CloudWatch memory metrics need to be generated.

Create an IAM role named "CustomMetricsRole" with a custom policy name "CustomEC2CloudWatch" to establish the interoperability between EC2 instance and CloudWatch as below
Policy : CustomEC2CloudWatch
Permissions:
{
"Version": "2012-10-17",
   "Statement": [
     {
      "Sid": "VisualEditor0",
      "Effect": "Allow",
      "Action": [

          "cloudwatch:GetMetricStatistics",
          "cloudwatch:PutMetricData",
          "cloudwatch:GetMetricData",
          "ec2:DescribeTags",
          "cloudwatch:ListMetrics"

       ],
       "Resource": "*"
     }
  ]
}
Attach IAM role to the EC2 instance

SSH to EC2 instance
$ sudo apt update
$ sudo apt install unzip
$ sudo apt install perl
$ sudo apt install liblwp-protocol-https-perl libdatetime-perl

Download the CloudWatch Monitoring perl scripts for Linux
$ wget http://aws-cloudwatch.s3.amazonaws.com/downloads/CloudWatchMonitoringScripts-1.2.1.zip
$ unzip CloudWatchMonitoringScripts-1.2.1.zip
$ cd aws-scripts-mon

mon-put-instance-data.pl - Collects system metrics on an EC2 instance and sends them to CloudWatch
mon-get-instance-stats.pl - Queries CloudWatch and displays the most resent metrics
AwsSignatureV4.pm - File template for AWS credentials

Push custom metrics from EC2 instance to CloudWatch
$ ./mon-put-instance-data.pl --mem-util --mem-used --mem-avail

Create crontab and add the script to run at every minute intervals.
$ crontab -e
* * * * * /home/ubuntu/aws-scripts-mon/mon-put-instance-data.pl --mem-util --mem-used --mem-avail

 

To retrive the most recent custom metrics from CloudWatch to EC2 instance
$
./mon-get-instance-stats.pl

Tags: ,

Amazon Web Service | CloudWatch | Perl

Disclaimer

The information provided here is based on my expreriences, troubleshooting and online/offline findings. It can be used as is on your own risk without any warranties and I impose no rights.

About the author

My name is Xavier Dilip Kumar Jayaraj having 13+ years of IT experience which includes solid experience and depth Knowledge in Application Life Cycle Management, Configuration Management, Implementation and Support using TFS on-premises and Azure DevOps. I have invested in gaining DevOps knowledege to expertise with Cloud Computing providers namely Microsoft Azure and Amazon Web Services in recent years. I am very positive to learn and adapt emerging technologies to client’s environment.

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