Test how your application handles an AWS Aurora failover. Run Gremlin network experiments and reliability tests to validate reconnection logic.
Fast failover is the headline reliability feature of Amazon Aurora, and it works as advertised. The question worth asking is what your application does during those seconds, because that behavior belongs to your code rather than to the database.
Seconds are long enough to matter, and Gremlin lets you watch them happen on your schedule. With Gremlin, you can:
- Rehearse a failover before AWS runs one for you. A blackhole experiment against the cluster endpoint reproduces exactly what a promotion looks like from the client side, including how long your connection pool takes to notice a dead socket.
- Find out whether you need a restart. Some applications reconnect cleanly. Others hold a stale endpoint until someone cycles the service, which turns a thirty-second event into a much longer one.
- Check where stale reads reach. A latency experiment simulates a lagging reader endpoint, which is fine for a dashboard and not fine for anything transactional.
Aurora will fail over on its own schedule eventually. It's worth having watched it happen at least once on yours.
Dependencies: Failure Test
Simulate a failed dependency by dropping all network traffic to the dependency.
Dependencies: Latency Test
Recreate poor network conditions by delaying all network traffic to a dependency by 100ms.
* Testing a dependency doesn't require installing anything on it. Gremlin runs the experiment from the service that calls it, so compatibility depends on that host rather than on the dependency itself. Check our compatibility documentation for supported operating systems and platforms, or get in touch if you don't see yours.
Intelligent Health Checks - AWS
Automatically monitor your AWS services during testing in one-click with Intelligent Health Checks.
AWS integration
Integrate Gremlin with your AWS account for automatic Health Check creation, service discovery, and more.
Using Failure Flags by proxy
Use Failure Flags, Gremlin's application-level fault injection feature, without changing a single line of code.
Installing Gremlin on Amazon ECS
Learn how to install Gremlin on EC2-backed Amazon Elastic Container Service (ECS) deployments.
Installing Gremlin on AWS - Configuring your VPC
Amazon Web Services (AWS) has unique networking requirements that must be implemented for Gremlin to run successfully…
Avoid downtime. Use Gremlin to turn failure into resilience.
Gremlin empowers you to proactively root out failure before it causes downtime. See how you can harness chaos to build resilient systems by requesting a demo of Gremlin.
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