Howto Monitor an EC2 Instance Using Nagios: Step-by-Step Guide
Nagios Core and Nagios XI can be used to monitor AWS resources such as EC2 instances and S3 bucket usage. With the help of AWS SDK tools, Nagios can collect metrics from your AWS account and display them in the Nagios monitoring dashboard.
To monitor EC2 instances, Nagios uses Boto3, the AWS SDK for Python. Boto3 allows Python applications to communicate with AWS services such as EC2, S3, and CloudWatch. It provides both a simple object-oriented interface and direct access to AWS service APIs.
Monitor EC2 Instances Using Nagios
To use the Amazon EC2 monitoring wizard in Nagios XI, make sure your Nagios XI version is 5.5.x or later.
Step 1: Install Required Packages
Before configuring EC2 monitoring, install the required dependency packages on the Nagios server.
yum install python-pip python-setuptools pip install boto3
The pip install boto3 command installs packages such as:
urllib3 jmespath python-dateutil simplejson docutils ordereddict botocore futures s3transfer boto3
Step 2: Create an AWS IAM User
Log in to the AWS Management Console and create a new IAM user with programmatic access.
Go to:
Services > IAM > Users > Add user
Enable Programmatic access so that AWS generates an Access Key ID and Secret Access Key.
Click Next: Permissions.
Attach an existing policy with read-only access to EC2 and S3. If you do not already have one, create a new policy that allows read-only access to the required AWS services.
Click Next: Tags.
Add any required tags, then click Next: Review.
Review the configuration and click Create user.
Download or copy the following credentials:
Access Key ID
Secret Access Key
These credentials will be used by Nagios to authenticate with AWS through the API.
Step 3: Configure Nagios XI
Log in to the Nagios XI web interface.
Navigate to:
Configure > Configuration Wizards
Select the Amazon EC2 wizard.
Enter the AWS Access Key ID and Secret Access Key, then click Get Available Instances.
Nagios will connect to AWS and display the available EC2 instances.
Select the EC2 instances you want to monitor.
Click Next, review the configuration, and then click Finish.
Important Network Requirement
Make sure the Nagios server can communicate with the AWS EC2 instances. The required routes must be reachable, and the necessary ports must be allowed in the EC2 security groups.
Default EC2 Checks in Nagios
Nagios can monitor common EC2 metrics such as:
- CPU Credit Balance
- CPU Credit Usage
- CPU Utilization
- Disk Read Bytes
- Disk Read Operations
- Disk Write Metrics
- Network Packets In
- Network Packets Out
- Instance Status
Conclusion
That’s it. You have now configured Nagios to monitor AWS EC2 instances. Once the setup is complete, Nagios will collect EC2 metrics and display the instance health, performance, and status from the Nagios monitoring dashboard.
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