Argo Rollouts

Argo Rollouts is a Kubernetes controller and set of CRDs which provide advanced deployment capabilities such as blue-green, canary, canary analysis, experimentation, and progressive delivery features to Kubernetes.

• Argo Rollouts integrated with ARgoCD
• Supports automated rollbacks
• Supports approvals

Progressive Delivery

• Gradually release software to users to minimize risk

Architecture

• The rollout controller is the brain of the canary release process
• There is a kubectl plugin for argo rollouts

Installatino Options

• Cluster-wide installation - the default
• Namespace-scoped installation

Convert a Standard Deployment to a Rollout Spec

• The deployment:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: rollouts-demo
spec:
  selector:
    matchLabels:
      app: rollouts-demo
  template:
    metadata:
      labels:
        app: rollouts-demo
    spec:
      containers:
      - name: rollouts-demo
        image: argoproj/rollouts-demo:blue
        ports:
        - containerPort: 8080
  strategy:
    rollingUpdate: {}

• Converted to Argo Rollout:

apiVersion: argoproj.io/v1alpha1  # Changed from apps/v1
kind: Rollout                     # Changed from Deployment
metadata:
  name: rollouts-demo
spec:
  selector:
    matchLabels:
      app: rollouts-demo
  template:
    metadata:
      labels:
        app: rollouts-demo
    spec:
      containers:
      - name: rollouts-demo
        image: argoproj/rollouts-demo:blue
        ports:
        - containerPort: 8080
  strategy:
    canary:                        # Changed from rollingUpdate or recreate
      steps:
      - setWeight: 20
      - pause: {}

• Rollout adds new strategies such as Blue/Green and Canary

WorkloadRef

apiVersion: apps/v1
kind: Deployment
metadata:
  name: rollout-ref-deployment
spec:
  replicas: 0
  selector:
    matchLabels:
      app: rollout-ref-deployment
  template:
    metadata:
      labels:
        app: rollout-ref-deployment
    spec:
      containers:
        - name: rollouts-demo
          image: argoproj/rollouts-demo:blue
          imagePullPolicy: Always
          ports:
            - containerPort: 8080

---
apiVersion: argoproj.io/v1alpha1
kind: Rollout
metadata:
  name: rollout-ref-deployment
spec:
  replicas: 5
  workloadRef:
    apiVersion: apps/v1
    kind: Deployment
    name: rollout-ref-deployment
  strategy:
    canary:
      steps:
        - setWeight: 20
        - pause: {duration: 10s}