# Fault Injection

FaultInjection policy helps you to test your microservices against resiliency. Kuma provides 3 different types of failures that could be imitated in your environment. These faults are Delay, Abort and ResponseBandwidth limit.

# Usage

On Universal:

type: FaultInjection
mesh: default
name: fi1
sources:
  - match:
      kuma.io/service: frontend
      version: "0.1"
destinations:
  - match:
      kuma.io/service: backend
      kuma.io/protocol: http
conf:        
  abort:
    httpStatus: 500
    percentage: 50
  delay:
    percentage: 50.5
    value: 5s
  responseBandwidth:
    limit: 50 mbps
    percentage: 50    
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On Kubernetes:

apiVersion: kuma.io/v1alpha1
kind: FaultInjection
mesh: default
metadata:
  name: fi1
spec:
  sources:
    - match:
        kuma.io/service: frontend
        version: "0.1"
        kuma.io/protocol: http
  destinations:
    - match:
        kuma.io/service: backend
        kuma.io/protocol: http
  conf:        
    abort:
      httpStatus: 500
      percentage: 50
    delay:
      percentage: 50.5
      value: 5s
    responseBandwidth:
      limit: 50 mbps
      percentage: 50 
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# Sources & Destinations

FaultInjection is a policy, which is applied to the connection between dataplanes. As most of the policies, FaultInjection supports the powerful mechanism of matching, which allows you to precisely match source and destination dataplanes.

FaultInjection policy available only for L7 HTTP traffic, kuma.io/protocol: http is mandatory tag for the destination selector.

# HTTP Faults

At least one of the following Faults should be specified.

# Abort

Abort defines a configuration of not delivering requests to destination service and replacing the responses from destination dataplane by predefined status code.

  • httpStatus - HTTP status code which will be returned to source side
  • percentage - percentage of requests on which abort will be injected, has to be in [0.0 - 100.0] range

# Delay

Delay defines configuration of delaying a response from a destination.

  • value - the duration during which the response will be delayed
  • percentage - percentage of requests on which delay will be injected, has to be in [0.0 - 100.0] range

# ResponseBandwidth limit

ResponseBandwidth defines a configuration to limit the speed of responding to the requests.

  • limit - represented by value measure in gbps, mbps, kbps or bps, e.g. 10kbps
  • percentage - percentage of requests on which response bandwidth limit will be injected, has to be in [0.0 - 100.0] range

# Matching

FaultInjection is an Inbound Connection Policy. You can use all the tags in both sources and destinations sections.

Last Updated: 8/26/2021, 1:55:59 PM