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Resilience testing on Amazon ElastiCache with AWS Fault Injection Service

Database Blog

This article explains how to use AWS Fault Injection Service (FIS) to test Amazon ElastiCache resilience by simulating node failures and validating failover mechanisms.

  • AWS FIS enables controlled fault injection experiments on ElastiCache clusters without custom scripts
  • Test setup uses Multi-AZ enabled Valkey cluster with primary and replica nodes
  • FIS action interrupts power to nodes in specified Availability Zone, triggering automatic failover
  • Replica with lowest replication lag promotes to primary; DNS endpoint automatically updates
  • Monitor failover via CloudWatch logs, ElastiCache events, and cluster status changes
  • Validate application gracefully handles brief connection interruptions and falls back to database
  • Typical failover completes within seconds; applications should see 5-15 second outages

This guide helps teams proactively identify weaknesses in caching strategies and validate failover mechanisms before production incidents occur.

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