aws-network-monitoring

DevOps & Security

Installs, configures, and troubleshoots Network Flow Monitor agents on EC2 instances to monitor network path health. Covers agent installation, IAM permissions, monitoring network paths, and troubleshooting agents reporting no metrics, HTTP 403 errors, or connectivity failures.

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How to use this skill

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Prompt to paste

I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/aws/agent-toolkit-for-aws/blob/HEAD/skills/specialized-skills/operations-skills/aws-network-monitoring/SKILL.md

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Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

AWS Network Monitoring

Overview

Domain expertise for installing and configuring Amazon CloudWatch Network Flow Monitor agents on EC2 instances. Covers IAM permission setup, agent installation via SSM Distributor or command-line install, agent activation, verification, and troubleshooting.

Network Flow Monitor agents are lightweight software that publish performance metrics (latency, packet loss) to the Network Flow Monitor backend, enabling monitoring of network path health between workloads.

Works best with the AWS MCP server — enables running SSM commands, attaching IAM policies, and validating agent status directly. All guidance also works with standard AWS CLI access.

Routing

User need	Action
Installing Network Flow Monitor agents on EC2	Read agent-install-ec2.md
Configuring IAM for Network Flow Monitor agents	Read agent-permissions.md
Troubleshooting Network Flow Monitor agents (403, no metrics, connectivity)	Read troubleshooting.md
Spans multiple areas	Read the most specific reference first, then consult others as needed

Files

File	Content
agent-install-ec2.md	End-to-end Network Flow Monitor agent installation via SSM Distributor, activation, verification
agent-permissions.md	IAM policy setup for Network Flow Monitor agent metric publishing
troubleshooting.md	Error → cause → fix for Network Flow Monitor agent issues (HTTP 403, missing metrics, connectivity)

Supported versions

For supported Linux distributions, kernel versions, and architectures, see the AWS documentation. Windows is not supported.

Security Considerations

Least-privilege IAM: Attach only CloudWatchNetworkFlowMonitorAgentPublishPolicy for publishing metrics and AmazonSSMManagedInstanceCore for SSM management. Do not use *FullAccess policies.
Private subnets: When the instance is in a private subnet, prefer VPC endpoints for SSM (com.amazonaws.<region>.ssm, .ssmmessages, .ec2messages) over a NAT gateway to keep traffic on the AWS network.
Credential storage: Never embed AWS credentials on the instance; the publish policy MUST be attached to the instance role, not configured as static keys.
Audit trail: Ensure CloudTrail is enabled in the account so SSM SendCommand invocations and IAM AttachRolePolicy actions performed during agent setup are logged for security investigations.
References: CloudWatch Network Flow Monitor security, IAM best practices