Zero deployment of Micro-Services with Kubernetes

Do you need to implement a zero-downtime deployment for your product? Did you consider Kubernetes? Check whether my slides, demos of different deployment strategies, and an service implementation example might help you get started. You can run all demos on minikube.

To see how to prepare your microservice, check Golang and .net core implementations (Looking for contributions in Py and Rust).

The demos cover recreate, rolling updates, blue-green, and canary deployment strategies. In future, I will add other deployment approaches - see TBD below.

Slides:

• Pdf (source: slides/)

Demos:

• Recreate
• Rolling Updates
• Blue Green
• Canary
• Canary with Traefik
• Micro-service implementation with Golang with missy
• Micro-service implementation with .net core. Contribution from Paweł Ruciński.

Helpful? Please give a LIKE to the most recent LinkedIn post about this talk or a STAR to this github repo.

Questions, Feedback? Let me know at [email protected].

ps. We are hiring - github.com/hypatos/jobs

Start

You can use a hosted kubernetes, in the demo I assume we are on minikube:

minikube start
kubectl config use-context minikube

Why minikube? I want to make it easy for you to start.

How to build your component

livenessProbe and readinessProbe

• livenessProbe:

  livenessProbe:
    httpGet:
      path: /model
      port: 8000
      httpHeaders:
        - name: X-Custom-Header
          value: Awesome
    initialDelaySeconds: 600
    periodSeconds: 5
    timeoutSeconds: 18
    successThreshold: 1
    failureThreshold: 3
  

• readinessProbe:

  readinessProbe:
    exec:
      command:
      - cat
       - /tmp/healthy
    initialDelaySeconds: 5
    periodSeconds: 5
  

Graceful shutdown

• handling SIGTERM
• health and ready implementation

Check demo and demo_net.

Looking for a Java implementation, check Mateusz Dyminski talk.

TBD

To Be Added before the next talk:

1. lifecycle: preStop sleep
2. cover: what happening is during a k8s upgrade
3. cover: anti-affinity
4. conver pod's disruption budget
5. shadow deployment with (most probably) Istio
6. feature switch with Golang
7. A/B deployment with Golang
8. Python example.
9. Java example.

History

Previous versions of the talk:

• Pizza&Tech meetup in Wroclaw - LinkedIN Slideshare
• DevOps Warsaw Meetup at Ocado
• Golang Warsaw meetup - pdf export

Related Work

• https://github.com/mateuszdyminski/zero
• https://kubernetes.io/blog/2018/04/30/zero-downtime-deployment-kubernetes-jenkins/
• https://container-solutions.com/kubernetes-deployment-strategies/
• https://github.com/ContainerSolutions/k8s-deployment-strategies/tree/master/ab-testing
• http://blog.christianposta.com/deploy/blue-green-deployments-a-b-testing-and-canary-releases/
• https://linkerd.io/
• https://istio.io/
• https://github.com/containous/traefik/blob/master/docs/user-guide/kubernetes.md
• https://docs.traefik.io/configuration/backends/kubernetes/