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Spring Boot Chaos Monkey

Choas Monkey

This module explores Chaos Engineering principles by intentionally injecting failures into a Spring Boot application to test its resilience. It demonstrates how to set up and integrate chaos-monkey-spring-boot for your microservices, as well as performance testing with Gatling to measure any degradation under chaos scenarios.

Key Features

  1. Chaos Injection: Simulate random latencies, exceptions, or resource unavailability.
  2. Performance Testing (Gatling): Benchmark throughput and latency under chaotic conditions.
  3. Monitoring: Validate that chaos is functioning by observing logs, metrics, or custom dashboards.

Run tests

./mvnw clean verify

Run Gatling

Bring the application up and then start Gatling

./mvnw gatling:test

Run locally

docker-compose -f docker/docker-compose.yml up -d
./mvnw spring-boot:run -Dspring-boot.run.profiles=local -Dspring-boot.run.arguments="--chaos.monkey.enabled=true"
./mvnw gatling:test

Verification:

  • Check application logs for entries containing "Chaos Monkey" to confirm injection events
  • Use Gatling or other load testing tools to measure:
    • Response time degradation
    • Error rate changes
    • System resource utilization

By default, Chaos Monkey is enabled. Let's disable it and run the tests again. It should improve the response times.

./mvnw spring-boot:run -Dspring-boot.run.profiles=local -Dspring-boot.run.arguments="--chaos.monkey.enabled=false"
./mvnw gatling:test

Results of gatling are stored in target folder for each run

Useful Links

Technologies used

  • Spring Boot
  • Gatling (Performance Tests)
  • Chaos Monkey (Chaos Engineering Principles)

Sample Test Results

We can observe that mean requests/sec is more when Chaos Monkey is enabled.

With Chaos Monkey Enabled

================================================================================ ---- Global Information --------------------------------------------------------

request count 6000 (OK=6000 KO=0 ) min response time 1 (OK=1 KO=- ) max response time 2635 (OK=2635 KO=- ) mean response time 145 (OK=145 KO=- ) std deviation 337 (OK=337 KO=- ) response time 50th percentile 15 (OK=15 KO=- ) response time 75th percentile 98 (OK=98 KO=- ) response time 95th percentile 773 (OK=773 KO=- ) response time 99th percentile 1952 (OK=1952 KO=- ) mean requests/sec 193.548 (OK=193.548 KO=- ) ---- Response Time Distribution ------------------------------------------------ t < 800 ms 5733 ( 96%) 800 ms <= t < 1200 ms 131 ( 2%) t ≥ 1200 ms 136 ( 2%) failed 0 ( 0%) ================================================================================

With Chaos Monkey disabled

================================================================================ ---- Global Information --------------------------------------------------------

request count 6000 (OK=6000 KO=0 ) min response time 4 (OK=4 KO=- ) max response time 13608 (OK=13608 KO=- ) mean response time 6289 (OK=6289 KO=- ) std deviation 2579 (OK=2579 KO=- ) response time 50th percentile 6396 (OK=6396 KO=- ) response time 75th percentile 8292 (OK=8292 KO=- ) response time 95th percentile 10342 (OK=10342 KO=- ) response time 99th percentile 11604 (OK=11604 KO=- ) mean requests/sec 176.471 (OK=176.471 KO=- ) ---- Response Time Distribution ------------------------------------------------ t < 800 ms 65 ( 1%) 800 ms <= t < 1200 ms 54 ( 1%) t ≥ 1200 ms 5881 ( 98%) failed 0 ( 0%) ================================================================================