AWS Architecture Blog·November 2, 2026Automating Disaster Recovery Agent Lifecycle on AWS EC2
This article details an automated solution for managing AWS Elastic Disaster Recovery (DRS) agents across their lifecycle on Amazon EC2 instances. It outlines an architecture leveraging AWS Systems Manager Automation, Amazon EventBridge, and EC2 tags to handle agent installation, health monitoring, and clean offboarding, significantly improving operational efficiency and RPO compliance for large EC2 fleets. The design focuses on robust, event-driven automation to ensure disaster recovery readiness.
Read original on AWS Architecture BlogThe Challenge of Managing Disaster Recovery Agents
Managing disaster recovery agents across a large fleet of EC2 instances presents significant operational challenges. Issues like stalled agents (impacting Recovery Point Objectives - RPO) and agents on decommissioned servers (incurring unnecessary costs) are common. Manual oversight is time-consuming and prone to errors, especially between DR drills. This article presents an automated solution designed to address these pain points by orchestrating the full lifecycle of AWS DRS agents.
Automated Lifecycle Phases and Architecture
The solution employs a tag-driven approach, where a single EC2 tag (`DR`) dictates the state and actions for each instance. Three core AWS Systems Manager (SSM) Automation documents manage the lifecycle phases:
- Onboarding: Installs/repairs the DRS agent, applies necessary tags, and validates registration. Triggered by SSM State Manager on a 30-minute schedule.
- Healing: Responds to replication stalls reported by AWS DRS. Triggered by Amazon EventBridge filtering `STALLED` events, it attempts agent restarts or reinstallations, escalating to operators for infrastructure issues.
- Offboarding: Cleans up when an instance is descoped (DR tag changed/deleted). Triggered by Amazon EventBridge, it stops replication, disconnects the source server, uninstalls the agent, and removes tags, including safeguards like re-checks and approval gates.
Design Principle: Event-Driven Automation
This architecture exemplifies event-driven automation. Critical actions (like healing a stalled agent or offboarding a server) are triggered reactively by system events (e.g., replication stalled, tag change) rather than relying solely on periodic checks. This allows for faster response times and more efficient resource utilization.
Cross-Region Interaction and Component Integration
The primary automation logic resides in the source AWS Region, where EC2 instances operate. Cross-Region calls are minimized and occur only when AWS DRS API interactions require targeting the DR Region (e.g., registration checks, teardown). Amazon EventBridge plays a crucial role in forwarding replication-stalled events from the DR Region to the source Region for processing by the `DRS-Agent-Heal` automation. Other AWS services like IAM, Amazon SNS, Amazon S3, and Amazon CloudWatch are integrated for secure execution, notifications, auditing, and monitoring.
| DR Tag Value | Description | Automation Action |
|---|
The solution leverages `AWS Transit Gateway` for secure and private cross-region network connectivity, ensuring replication traffic and API calls between source and DR regions are isolated and performant.
Benefits and Architectural Takeaways
This automated approach significantly reduces manual overhead, improves RPO compliance by proactively addressing stalled replication, and optimizes costs by ensuring clean agent offboarding. Key architectural takeaways include the power of tag-based configuration, event-driven orchestration for operational tasks, and the strategic use of serverless and managed services (SSM Automation, EventBridge) to build resilient infrastructure management solutions without maintaining custom code.