The basics you need to know to get up and running with Chaos Monkey in your Amazon Web Service's Cloud enviornment. Links: CloudFormation Template: https://github.com/joehack3r/aws/blob/master/cloudformation/templates/chaosMonkey.json Simian Army Quick Start Guide: https://github.com/Netflix/SimianArmy/wiki/Quick-Start-Guide Chaos Monkey Configuration: https://github.com/Netflix/SimianArmy/wiki/Chaos-Settings Chaos Monkey Army: https://github.com/Netflix/SimianArmy/wiki/The-Chaos-Monkey-Army

1. NETFLIX’S
CHAOS
MONKEY
Michael Whitehead

2. “EVERYTHING FAILS ALL THE TIME”
- WERNER VOGELS

3. CHAOS MONKEY
A service that causes failure and
wreaks havoc on instances in Auto
Scaling Groups
A member of the Simian Army
developed by Netflix

4. WHY WOULD WE INTENTIONALLY
CAUSE FAILURE?!?
 It is inevitable
 Infrastructure is Complex
 Forcing failure puts you in control
 Identify faults in your architecture
• Does you load balancers reroute traffic correctly?
• Do your instances function correctly when they come back up?
• Are you monitoring tools alerting you on important events?

5. GETTING STARTED WITH CHAOS MONKEY
 Amazon Web Services
 Must be using Auto Scaling Groups
 Uses Amazon SimpleDB for event storage
 Simple Email Service setup (optional for notifications)
 Can be used with Netflix’s Asgard (optional)
 Java 7 JDK or newer

6. WOW!
EXAMPLE WITH CLOUDFORMATION
NEAT!
AWESOME!
COOL!
NO WAY!

7. BUILDING & CONFIGURATION
 Clone SimianArmy repo from Github
 Builds using Gradle
 Runs 6 times a day during business hours- 9am to 3pm
 Does not run on holidays or weekends
 Timeframes and frequency of runs can be configured

8. IMPORTANT PROPERTIES
 Enabling Chaos Monkey
 Set simianarmy.chaos.enabled = true
 Set simianarmy.chaos.leashed=false
 Probability of 1 instance being terminated per day per ASG
 simianarmy.chaos.ASG.probability = 1.0
 Opt-in or Opt-out model

9. OPT-IN / OPT-OUT MODEL
 Set to False = Opt-in Set to True = Opt-out
 simianarmy.chaos.ASG.enabled = false
 When Opt-In (false) you must enable each auto scaling group you
want to run Chaos Monkey in
 simianarmy.chaos.<<auto scaling group name>>.enabled = true
 When Opt-Out (true) you must disable each auto scaling group
you do not want it to run in
 simianarmy.chaos.<<auto scaling group name>>.enabled = false

10. EMAIL NOTIFICATIONS

11. ARE TERMINATIONS ALL IT CAN DO?
 Block all network traffic
 Burn CPU
 Burn IO
 Fill Disk
 Kill Processes
 Network Loss
 Null-Route
• All EC2 <-> EC2 traffic
SSH REQUIRED
 Detach all EBS volumes
 Fail DNS
 Fail EC2 API
 Fail S3 API
 Fail DynamoDB API
 Network Corruption
 Network Latency

12. LINKS
 CloudFormation Template:
https://github.com/joehack3r/aws/blob/master/cloudformation/te
mplates/chaosMonkey.json
 Chaos Monkey Announcement:
http://techblog.netflix.com/2012/07/chaos-monkey-released-into-
wild.html
 Simian Army Quick Start Guide:
https://github.com/Netflix/SimianArmy/wiki/Quick-Start-Guide
 Chaos Monkey Configuration:
https://github.com/Netflix/SimianArmy/wiki/Chaos-Settings
 Chaos Monkey Army:
https://github.com/Netflix/SimianArmy/wiki/The-Chaos-Monkey-Army