Go client to the Chaos Monkey REST API that can be used to trigger and retrieve chaos events.
This project was started for the purpose of controlled failure injection during GameDay events.
First of all, you need a running Simian Army that exposes its REST API via HTTP.
In order to trigger chaos events via the API, Chaos Monkey must be unleashed and on-demand termination must be enabled via these configuration properties:
simianarmy.chaos.leashed = false simianarmy.chaos.terminateOndemand.enabled = true
If you plan to use the REST API only, you should also disable all scheduled terminations:
simianarmy.chaos.asg.enabled = false
If you're on Mac OS X, the easiest way to get the
chaosmonkey command-line tool is via Homebrew:
brew tap mlafeldt/formulas brew install chaosmonkey
You can also build the tool from source, provided you have Go installed:
go get -u github.com/mlafeldt/chaosmonkey
Use the tool to:
Trigger a new chaos event:
chaosmonkey -endpoint http://example.com:8080 \ -group ExampleAutoScalingGroup -strategy ShutdownInstance
Trigger the same event 5 times at intervals of 10 seconds, with a probability of 20% per event:
chaosmonkey -endpoint http://example.com:8080 \ -group ExampleAutoScalingGroup -strategy ShutdownInstance \ -count 5 -interval 10s -probability 0.2
This is useful to terminate more than one EC2 instance of an auto scaling group.
Get a list of past chaos events:
chaosmonkey -endpoint http://example.com:8080
List available chaos strategies, which you may pass to
List all auto scaling groups for a given AWS account, which you may then pass to
export AWS_ACCESS_KEY_ID=... export AWS_SECRET_ACCESS_KEY=... export AWS_REGION=... export AWS_ROLE=... chaosmonkey -list-groups
Wipe state of Chaos Monkey by deleting its SimpleDB domain (named
export AWS_ACCESS_KEY_ID=... export AWS_SECRET_ACCESS_KEY=... export AWS_REGION=... export AWS_ROLE=... chaosmonkey -wipe-state SIMIAN_ARMY
Warning: Requires a restart of Chaos Monkey.
As always, invoke
chaosmonkey -h for a list of all available options.
In addition to command-line options, the tool also understands these environment variables:
CHAOSMONKEY_ENDPOINT- the same as
CHAOSMONKEY_USERNAME- the same as
CHAOSMONKEY_PASSWORD- the same as
Use with Docker
This Docker image allows you to deploy Chaos Monkey with a single command:
docker run -it --rm -p 8080:8080 \ -e SIMIANARMY_CLIENT_AWS_ACCOUNTKEY=$AWS_ACCESS_KEY_ID \ -e SIMIANARMY_CLIENT_AWS_SECRETKEY=$AWS_SECRET_ACCESS_KEY \ -e SIMIANARMY_CLIENT_AWS_REGION=$AWS_REGION \ -e SIMIANARMY_CHAOS_LEASHED=false \ -e SIMIANARMY_CHAOS_ASG_ENABLED=false \ -e SIMIANARMY_CHAOS_TERMINATEONDEMAND_ENABLED=true \ mlafeldt/simianarmy
Afterwards, you can use
chaosmonkey to talk to the dockerized Chaos Monkey:
chaosmonkey -endpoint http://$DOCKER_HOST_IP:8080 ...
In addition to the CLI tool, the project also provides the
chaosmonkey Go library for use in other Go projects. To install it from source:
go get -u github.com/mlafeldt/chaosmonkey/lib
For usage and examples, see the Godoc documentation.
- Article: Using Chaos Monkey whenever you feel like it
- Article: A Little Story about Amazon ECS, systemd, and Chaos Monkey
- Talk: Chaos Monkey for Fun and Profit
- Talk: Embracing Failure in a Container World
This project is being developed by Mathias Lafeldt.