Disaster recovery

Q: How deeply does Amazon Web Services in Action, Third Edition: An in-depth guide to AWS cover disaster recovery?

Defines RTO and RPO, then demonstrates cross-region snapshot copying; it stops short of a complete recovery runbook.

As explained in Amazon Web Services in Action, Third Edition: An in-depth guide to AWS

Disaster recovery is the set of processes and capabilities for restoring systems and data after a disruptive failure or destructive event.

Disaster recovery is the set of processes and capabilities for restoring systems and data after a disruptive failure or destructive event. In cloud architectures, it includes preparing for virtual-machine, availability-zone, and region-wide outages. section 13.0 section 13.3

Start by defining two business measures:

Recovery time objective (RTO) is how long the system may remain unavailable before reaching a working state. section 13.3
Recovery point objective (RPO) is the acceptable amount of data loss, expressed as time between the failure and the latest recoverable data. section 13.3
Use these objectives to choose an architecture, because higher availability increases system complexity and initial and operating costs. section 13.3

Copy an RDS snapshot across regions

To prepare for a region-wide outage, copy a database snapshot from us-east-1 to eu-west-1, then restore a database from the copied snapshot. Retrieve the source snapshot ARN before copying it. Check privacy and compliance rules before moving real data between regions. section 10.3.4

$ aws rds describe-db-snapshots \
 --db-snapshot-identifier wordpress-manual-snapshot \
 --query "DBSnapshots[0].DBSnapshotArn" --output text

Retrieve the ARN of the manual RDS snapshot before using the cross-region copy operation. section 10.3.4

$ aws rds copy-db-snapshot \
 --source-db-snapshot-identifier $SourceSnapshotArn \
 --target-db-snapshot-identifier wordpress-manual-snapshot \
 --region eu-west-1

Copy the identified RDS snapshot to the eu-west-1 region for later database restoration. section 10.3.4

How Amazon Web Services in Action, Third Edition: An in-depth guide to AWS covers it

Cover of Amazon Web Services in Action, Third Edition: An in-depth guide to AWS

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Also explained in

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Related concepts

recovery point objectivemeasured by · A recovery point objective is the maximum acceptable amount of data loss, typically expressed as the time between a disruption and the latest recoverable state.
recovery time objectivemeasured by · A recovery time objective is the maximum acceptable duration for restoring a disrupted system, service, workload, or business function to operation.
backup and restoreuses · Backup and restore is the practice of preserving copies of data or system state and using them to recover it after loss, damage, or failure.
disaster recovery testingused by · Disaster recovery testing is a planned exercise that evaluates whether systems, data, procedures, and personnel can recover after a disruptive failure.
replicationaddressed by · Replication is the creation or maintenance of multiple copies of data, state, or functionality across separate locations or components.

This explainer was generated by Manning's knowledge graph from the text of Amazon Web Services in Action, Third Edition: An in-depth guide to AWS. The section links point to the parts of the book it draws on.