Enable Memory and Disk Utilization Metric for Ubuntu Instance on AWS

This article will illustrate you using CloudWatch for capturing Memory and Disk Utilization Metrics for Ubuntu Instance on AWS.

Step 1: Attach required permission

Ensuring EC2 has sufficient IAM Role to put data in CloudWatch. EC2 Instance Profile require the following permission in order to put data in Cloud Watch.

Create a policy with the following permission:

• cloudwatch:PutMetricData
• cloudwatch:GetMetricStatistics
• cloudwatch:ListMetrics
• ec2:DescribeTags

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "ec2:Describe*",
                "cloudwatch:PutMetricData",
                "cloudwatch:GetMetricStatistics",
                "cloudwatch:ListMetrics"
            ],
            "Effect": "Allow",
            "Resource": "*"
        }
    ]
}

Step 2: Install the required package

sudo apt-get update
sudo apt-get install unzip
sudo apt-get install libwww-perl libdatetime-perl

Step 3: Install monitoring scripts

curl https://aws-cloudwatch.s3.amazonaws.com/downloads/CloudWatchMonitoringScripts-1.2.2.zip -O
unzip CloudWatchMonitoringScripts-1.2.2.zip && \
rm CloudWatchMonitoringScripts-1.2.2.zip && \
cd aws-scripts-mon

Step 4: Run the script in Cron

*/5 * * * *  ~/aws-scripts-mon/mon-put-instance-data.pl --mem-used-incl-cache-buff --mem-util --mem-used --mem-avail --disk-space-util --disk-path=/ --disk-path=/dev  --from-cron

Here, — from-cron is used to suppress all diagnostic output and error message are sent to the local system logs.