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Kubernetes: Deployment - Common Strategies

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• Kubernetes: Deployment - Common Strategies
  • Common deployment strategies
    • Canary deployment strategy
    • A/B strategy
    • The Blue/Green strategy
    • Traffic shadowing

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Common deployment strategies

strategy	Desc
Recreate / big bang	Stop all old Pods, then create all new Pods
RollingUpdate /Ramped/ Incremental	Gradually replace the old Pods with the new ones
Canary / pilot / Grayscale Release	Create a very small number of new Pods for testing, then replace all the remaining Pods.
A/B testing	Create a small number of new Pods to collect data
Blue/Green	Deploy new Pods in parallel with old pods. Swith when ready and delete the old one
Shadowing / Traffic mirroring / Dark launch	Deploy new Pods in parallel with old pods. return respone from only the old pods

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Canary deployment strategy

• implementation in k8s
  • option 1:
    • high minReadySeconds + kubectl rollout pause
      • pause after the first Pod(canary pod) and test the new pod
    • once confirm canary pod acts as expected, kubectl rollout resume to resume
  • option 2:
    • create a separate canary Deployment for the canary Pods with low replicas
    • configure Service forward traffic to canary Deployment
    • Once Canary deployment meets requirments, roll out the old deployment and delete Canary deployment

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A/B strategy

• implement in k8s
  • Create 2 deployments and 2 services
  • create an ingress and path rule to route traffic forward to 2 services based on the condition

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The Blue/Green strategy

• Blue Deployment: the stable production deployment

• Green Deployment: the deployment along with production deployment

• Implementation in k8s
  • Configure Service with label selector targeting the Blue Deployment
  • Create Green Deployment for testing
  • Once Green Deployment meets the requirements, update the Service’s label selector to target the Green Deployment

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Traffic shadowing

• implementation in k8s
  • Create shdowing deployment with shadowing service
  • Configure the ingress
    • forward the incoming traffic to the shdowing deployment
    • discard the response from the shdowing deployment