Cloud Intermediate

Kubernetes Deployment Strategies¶

KubernetesDeploymentRolling Update 3 min read

RollingUpdate, Recreate, Blue-Green and Canary in Kubernetes.

RollingUpdate¶

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp
spec:
  replicas: 4
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1        # Max extra pods
      maxUnavailable: 0   # Zero downtime
  template:
    spec:
      containers:
        - name: app
          image: myapp:v2

Recreate¶

Deletes all pods and creates new ones. Has downtime, but simple for stateful apps.

Canary with Argo Rollouts¶

apiVersion: argoproj.io/v1alpha1
kind: Rollout
spec:
  strategy:
    canary:
      steps:
        - setWeight: 5
        - pause: {duration: 5m}
        - setWeight: 25
        - pause: {duration: 10m}
        - setWeight: 75
        - pause: {duration: 5m}

Summary¶

RollingUpdate is the default and sufficient in most cases. For more sophisticated strategies, use Argo Rollouts.

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