Automation runbooks

Codified, event-triggered operational tasks.

The DevOps mandate is to automate operations, and SSM Automation runbooks are how you turn manual procedures into codified, repeatable, auditable actions — from routine maintenance to automated incident remediation.

Runbooks as code

An SSM Automation document (runbook) codifies a multi-step operational task — patch and reboot in sequence, create an AMI, rotate a credential, restore from backup, remediate a security finding — as a versioned document that runs the same way every time with IAM-scoped permissions. Instead of an engineer following a wiki page under pressure, the runbook executes the steps consistently and leaves a record. AWS provides many managed runbooks, and you write custom ones for your procedures. This is the operational equivalent of infrastructure as code: your operational knowledge becomes reviewed, testable, reusable automation rather than tribal memory.

# EventBridge rule → SSM Automation runbook = automated remediation.
# e.g. a Config rule finds a public S3 bucket → run a runbook that re-applies
#      Block Public Access, then notifies and opens a ticket.
{
  "source": ["aws.config"],
  "detail": { "newEvaluationResult": { "complianceType": ["NON_COMPLIANT"] } }
}
#   → target: SSM Automation "AWS-DisableS3BucketPublicReadWrite"
# Consistent, instant, logged remediation — no human in the critical path.

Event-driven automation and self-healing

The powerful pattern is connecting automation to events: EventBridge routes an AWS event (a Config non-compliance, a GuardDuty finding, a CloudWatch alarm) to a runbook or Lambda that responds in seconds — quarantine a resource, re-apply a control, scale a fleet, restart a service. This is self-healing infrastructure: the system detects and fixes known problems without waiting for a human. As with any automated action, scope it carefully — auto-remediate well-understood, low-risk cases and route higher-risk ones through approval. Codifying operations as event-triggered runbooks is what moves a team from reactive firefighting to proactive, automated operations, and it is central to both the exam and the discipline.