Kuma Star

MeshFaultInjection

With the MeshFaultInjection policy you can easily test your microservices against resiliency.

This policy uses a new policy matching algorithm. Do not combine with FaultInjection.

targetRef support matrix

targetRef Allowed kinds
targetRef.kind Mesh, MeshSubset, MeshService, MeshServiceSubset
from[].targetRef.kind Mesh, MeshSubset, MeshServiceSubset

To learn more about the information in this table, see the matching docs.

Configuration

MeshFaultInjection allows configuring a list of HTTP faults. They execute in the same order as they were defined.

default:
  http:
    - abort:
        httpStatus: 500
        percentage: "2.5"
      delay:
        value: 5s
        percentage: 5
      responseBandwidth:
        limit: "50Mbps"
        percentage: 50
    - abort:
        httpStatus: 500
        percentage: 10
    - delay:
        value: 5s
        percentage: 5

It’s worth mentioning that percentage of the next filter depends on the percentage of previous ones.

http:
  - abort:
      httpStatus: 500
      percentage: 70
  - abort:
      httpStatus: 503
      percentage: 50

That means that for 70% of requests, it returns 500 and for 50% of the 30% that passed it returns 503.

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, has to be in [100 - 599] range
  • percentage - a percentage of requests on which abort will be injected, has to be in [0.0 - 100.0] range. If the value is a double number, put it in quotes.

Delay

Delay defines a configuration of delaying a response from a destination.

  • value - the duration during which the response will be delayed
  • percentage - a percentage of requests on which abort will be injected, has to be in [0.0 - 100.0] range. If the value is a double number, put it in quotes.

ResponseBandwidth limit

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

  • limit - represented by value measure in Gbps, Mbps, kbps, or bps, e.g. 10kbps
  • percentage - a percentage of requests on which abort will be injected, has to be in [0.0 - 100.0] range. If the value is a double number, put it in quotes.

Examples

Service backend returns 500 for 50% of requests from frontend service

apiVersion: kuma.io/v1alpha1
kind: MeshFaultInjection
metadata:
  name: default
  namespace: kuma-system
  labels:
    kuma.io/mesh: default # optional, defaults to `default` if it isn't configured
spec:
  targetRef:
    kind: MeshService
    name: backend
  from:
    - targetRef:
        kind: MeshSubset
        tags: 
          kuma.io/service: frontend
      default:
        http:
          - abort:
              httpStatus: 500
              percentage: 50

Apply the configuration with kubectl apply -f [..].

50.5% of requests to service backend from any service is going to be delayed by 5s

apiVersion: kuma.io/v1alpha1
kind: MeshFaultInjection
metadata:
  name: default
  namespace: kuma-system
  labels:
    kuma.io/mesh: default # optional, defaults to `default` if it isn't configured
spec:
  targetRef:
    kind: MeshService
    name: backend
  from:
    - targetRef:
        kind: MeshSubset
        tags:
          kuma.io/service: frontend
      default:
        http:
          - delay:
              percentage: "50.5"
              value: 5s

Apply the configuration with kubectl apply -f [..].

Backend service with a list of faults that are applied for frontend service

apiVersion: kuma.io/v1alpha1
kind: MeshFaultInjection
metadata:
  name: default
  namespace: kuma-system
  labels:
    kuma.io/mesh: default # optional, defaults to `default` if it isn't configured
spec:
  targetRef:
    kind: MeshService
    name: backend
  from:
    - targetRef:
        kind: MeshSubset
        tags:
          kuma.io/service: frontend
      default:
        http:
          - abort:
              httpStatus: 500
              percentage: "2.5"
          - abort:
              httpStatus: 500
              percentage: 10
          - delay:
              value: 5s
              percentage: 5

Apply the configuration with kubectl apply -f [..].

All policy options