Remediation Config

The remediation config describes a remediation workflow in a declarative manner. Hence, it only defines what needs to be done and leaves all the details to other components.

Declare a remediation sequence in shipyard

The definition of a remediation sequence is done in a so-called Shipyard file.

Example: Simple shipyard file with a remediation sequence in a single stage

apiVersion: "spec.keptn.sh/0.2.2"
kind: "Shipyard"
metadata:
  name: "shipyard-sockshop"
spec:
  stages:
    - name: "production"
      sequences:
        - name: "remediation"
          triggeredOn:
            - event: "production.remediation.finished"
              selector:
                match:
                  evaluation.result: "fail"
          tasks:
            - name: "get-action"
            - name: "action"
            - name: "evaluation"
              triggeredAfter: "10m"
              properties:
                timeframe: "10m"

Note: Remediations can also be used in combination with multi stage delivery workflows.

Configure Remediation

Below is an example of a declarative remediation config:

Example of a remediation configuration:

apiVersion: spec.keptn.sh/0.1.4
kind: Remediation
metadata:
  name: serviceXYZ-remediation
spec:
  remediations:
    - problemType: Response time degradation
      actionsOnOpen:
        - action: scaling
          name: Scaling ReplicaSet by 1
          description: Scaling the ReplicaSet of a Kubernetes Deployment by 1
          value: "1"

A remediation is configured based on two properties:

• problemType: Maps a problem to a remediation.
• actionsOnOpen: Declares a list of actions triggered in course of the remediation.

Problem type

The problem type maps a problem to a remediation by a matching problem title.

• It is possible to declare multiple problem types for a remediation.
• For the case of triggering a remediation based on an unknown problem, the problem type default is supported.

The below example shows a remediation configured for the problem type Response time degradation and Failure rate increase as well as any unknown problem.

apiVersion: spec.keptn.sh/0.1.4
kind: Remediation
metadata:
  name: serviceXYZ-remediation
spec:
  remediations:  
  - problemType: Response time degradation
    actionsOnOpen:
  - problemType: Failure rate increase
    actionsOnOpen:
  - problemType: default
    actionsOnOpen:

Actions on open

• An action has a name used for display purposes.
• The description provides more details about the action.
• The action property specifies a unique name required by the action-provider (Keptn-service) that executes the action.
• The value property allows adding an arbitrary list of values for configuring the action.

If multiple actions are declared, Keptn sends out events in sequential order. Given the below example, the event for triggering scaling is sent out before the event for featuretoggle is fired.

---
apiVersion: spec.keptn.sh/0.1.4
kind: Remediation
metadata:
  name: serviceXYZ-remediation
spec:
  remediations:  
  - problemType: Response time degradation
    actionsOnOpen:
    - name: Scaling ReplicaSet by 1
      description: Scaling the ReplicaSet of a Kubernetes Deployment by 1
      action: scaling
      value: "1"
    - name: Toogle feature flag
      action: featuretoggle
      description: Toggle feature flag EnablePromotion from ON to OFF.
      value: 
        EnablePromotion: off

Add Remediation Config to a Service

Important: In the following command, the value of resourceUri must be set to remediation.yaml.

• To add an remediation config to a service, use the keptn add-resource command:

  keptn add-resource --project=sockshop --stage=production --service=serviceXYZ --resource=remediation.yaml --resourceUri=remediation.yaml