Deployment Policies for Progressive Delivery

Policy Configuration

Workload Policies

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: progressive-delivery-policy
spec:
  validationFailureAction: enforce
  background: false
  rules:
    - name: require-deployment-strategy
      match:
        resources:
          kinds:
            - Deployment
      validate:
        message: "Progressive delivery configuration is required"
        pattern:
          spec:
            strategy:
              type: "RollingUpdate"
              rollingUpdate:
                maxSurge: "25%"
                maxUnavailable: "25%"

Release Strategies

Blue-Green Configuration

apiVersion: flagger.app/v1beta1
kind: Canary
metadata:
  name: app-deployment
spec:
  provider: kubernetes
  targetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: app
  service:
    port: 80
    targetPort: 8080
  analysis:
    interval: 30s
    threshold: 5
    iterations: 10
    match:
      - headers:
          x-canary:
            exact: "true"
    webhooks:
      - name: acceptance-test
        type: pre-rollout
        url: http://tester.testing/
      - name: load-test
        type: rollout
        url: http://tester.testing/
    metrics:
      - name: request-success-rate
        thresholdRange:
          min: 99
        interval: 1m

A/B Testing Strategy

apiVersion: flagger.app/v1beta1
kind: Canary
metadata:
  name: ab-test-app
spec:
  provider: kubernetes
  targetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: app
  service:
    port: 80
    targetPort: 8080
    headers:
      - name: Cookie
        value: "user=^(.*?)"
    gateways:
    - public-gateway
  analysis:
    interval: 30s
    threshold: 10
    iterations: 10
    match:
      - headers:
          cookie:
            regex: "^(.*?)"
    metrics:
      - name: conversion-rate
        interval: 1m
        thresholdRange:
          min: 5

Service Mesh Integration

Istio Configuration

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: app-routes
spec:
  hosts:
  - app.example.com
  http:
  - match:
    - headers:
        x-canary:
          exact: "true"
    route:
    - destination:
        host: app-canary
        subset: v2
      weight: 10
    - destination:
        host: app-primary
        subset: v1
      weight: 90

Best Practices

1. Policy Management
   • Version control
   • Change tracking
   • Regular reviews
   • Compliance checks
2. Release Strategy
   • Traffic control
   • Metric validation
   • Rollback criteria
   • User segmentation
3. Testing
   • Pre-deployment checks
   • Load testing
   • Integration tests
   • User acceptance
4. Security
   • Access controls
   • Network policies
   • Secrets management
   • Compliance validation