Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Kubernetes 101

Kubernetes 101

Slides from Google NEXT Extended Singapore event

vincentdesmet

April 01, 2017
Tweet

More Decks by vincentdesmet

Other Decks in Technology

Transcript

  1. Applications evolve Reference: http://docker.com Loosely Coupled Services Many Small Servers

    ~2000 Today Monolithic Big Servers Slow changing Rapidly updated
  2. Containers / VMs Infrastructure Container Runtime Interface Bins / Libs

    Host OS Infrastructure Hypervisor AppA Bins / Libs AppA Guest OS Bins/Libs AppB Guest OS Bins/Libs AppB
  3. Docker containers Reference: http://docker.com • Packages up software binaries and

    dependencies • Isolates software from each other • Container is a standard format • Easily portable across environment • Allows ecosystem to develop around its standard Container
  4. Docker Concepts Docker Image The basis of a Docker container

    Docker Container The standard unit in which the application service resides Docker Engine Creates, ships and runs Docker containers deployable on physical or virtual host locally, in a datacenter or cloud service provider Docker Registry On-premises registry for image storing and collaboration
  5. WHAT IS KUBERNETES? •Container orchestrator •Runs and manages containers •Supports

    multiple cloud & bare-metal environments •100% Open Source written in Go •Built on decades of experience of running containers at Google •First project hosted by CNCF (Accepted on Mar. 11 2016) Container packaged Dynamically scheduled (Micro) Service oriented
  6. LABELS app : my-app role : master track: stable app

    : my-app role : worker track: stable app : my-app role : worker track: canary app : my-app role : master track: canary
  7. SELECTORS app : my-app app : my-app role : master

    track: stable app : my-app role : worker track: stable app : my-app role : worker track: canary app : my-app role : master track: canary
  8. SELECTORS app : my-app role : worker app : my-app

    role : master track: stable app : my-app role : worker track: stable app : my-app role : worker track: canary app : my-app role : master track: canary
  9. SELECTORS app : my-app track: canary app : my-app role

    : master track: stable app : my-app role : worker track: stable app : my-app role : worker track: canary app : my-app role : master track: canary
  10. CONTROL LOOPS Desired state Actual state pods: - foo -

    bar pods: - foo create “bar” Create
  11. REPLICA SETS + Replica Set: - replicas: 1 - selector:

    - app: my-app - version: 1.0 - Desired State: - Pod Specification - Replica Count - Label Selector
  12. SERVICES Service: - nodePort: 30128 - selector: - app: my-app

    - version: 1.0 - de-couple discovery from application - Define how to access pods - Act as a proxy (Virtual IP - stable for DNS) Think of: - Dynamic Routing Table
  13. CANARIES + Replica Set: - replicas: 2 - selector: -

    app: my-app - version: 1.0 Service: - nodePort: 30128 - selector: - app: my-app + Replica Set: - replicas: 1 - selector: - app: my-app - version: canary Think of: - Partially live the new version
  14. DEPLOYMENTS Service: - nodePort: 30128 - selector: - app: my-app

    + Replica Set: - replicas: 2 - selector: - app: my-app - version: 1.0 + - Manage updates with Deployment resources
  15. UPDATES Service: - nodePort: 30128 - selector: - app: my-app

    + Replica Set: - replicas: 4 - selector: - app: my-app - version: 1.0 + Deployment: - strategy: - rollingUpdate
  16. UPDATES Service: - nodePort: 30128 - selector: - app: my-app

    + + Replica Set: - replicas: 1 - selector: - app: my-app - version: 2.0 Replica Set: - replicas: 4 - selector: - app: my-app - version: 1.0 + Deployment: - strategy: - rollingUpdate
  17. UPDATES Service: - nodePort: 30128 - selector: - app: my-app

    + + Replica Set: - replicas: 1 - selector: - app: my-app - version: 2.0 Replica Set: - replicas: 3 - selector: - app: my-app - version: 1.0 + Deployment: - strategy: - rollingUpdate
  18. UPDATES Service: - nodePort: 30128 - selector: - app: my-app

    + + Replica Set: - replicas: 2 - selector: - app: my-app - version: 2.0 Replica Set: - replicas: 3 - selector: - app: my-app - version: 1.0 + Deployment: - strategy: - rollingUpdate
  19. UPDATES Service: - nodePort: 30128 - selector: - app: my-app

    + + Replica Set: - replicas: 2 - selector: - app: my-app - version: 2.0 Replica Set: - replicas: 2 - selector: - app: my-app - version: 1.0 + Deployment: - strategy: - rollingUpdate
  20. UPDATES Service: - nodePort: 30128 - selector: - app: my-app

    + + Replica Set: - replicas: 3 - selector: - app: my-app - version: 2.0 Replica Set: - replicas: 2 - selector: - app: my-app - version: 1.0 + Deployment: - strategy: - rollingUpdate
  21. UPDATES Service: - nodePort: 30128 - selector: - app: my-app

    + + Replica Set: - replicas: 3 - selector: - app: my-app - version: 2.0 Replica Set: - replicas: 1 - selector: - app: my-app - version: 1.0 + Deployment: - strategy: - rollingUpdate
  22. UPDATES Service: - nodePort: 30128 - selector: - app: my-app

    + Replica Set: - replicas: 4 - selector: - app: my-app - version: 2.0 Replica Set: - replicas: 1 - selector: - app: my-app - version: 1.0 + + Deployment: - strategy: - rollingUpdate
  23. UPDATES Service: - nodePort: 30128 - selector: - app: my-app

    + Replica Set: - replicas: 4 - selector: - app: my-app - Version: 2.0 Replica Set: - replicas: 0 - selector: - app: my-app - version: 1.0 + + Deployment: - strategy: - rollingUpdate
  24. UPDATES Service: - nodePort: 30128 - selector: - app: my-app

    + Replica Set: - replicas: 4 - selector: - app: my-app - Version: 2.0 + Deployment: - strategy: - rollingUpdate
  25. CONFIGMAPS Service: - nodePort: 30128 - selector: - app: my-app

    + + Deployment: - strategy: - rollingUpdate ConfigMap: - sample.yaml: | env: production cache: true max_threads: 8
  26. SECRETS Service: - nodePort: 30128 - selector: - app: my-app

    + + Deployment: - strategy: - rollingUpdate Secret: - sample.yaml: | key: *** db_user: *** db_pw: ***
  27. Getting Started - Free trial cluster - cloud.google.com/container-engine (single node)

    locally - github.com/kubernetes/minikube - Join www.meetup.com/GCPUGSG/
  28. Recap - Multiple resource types - Deployments - Services -

    ConfigMaps - Secrets - … - Serializable Manifests: Infrastructure as code
  29. Overview Concepts: - Containers - Pods - Volumes - Labels

    & Label Queries - Control Loops & Controllers - Deployment - ReplicaSet - Service
  30. Helm: Package Manager - Collaboration with Google, Bitnami, Deis and

    others - Deis/Helm -> Kubernetes/Helm - Architecture: - Client: Helm - Server: Tiller - This talk: - Focused on writing charts
  31. Helm core values - Aim for the Apt/Yum/Homebrew UX -

    Ensure collaboration - Reproducible releases - Shareable Packages
  32. Chart, Repositories, Releases - Chart: “Package”, “Bundle” - Repository: Package

    Repository Evolving towards a registry (CoreOS) - Release: Installed Chart (same chart can be installed multiple times)
  33. Review using helm - Install charts (creates a release) -

    helm install - List releases - helm ls - - Bootstrap charts - helm create
  34. More features - Upgrade Releases - helm upgrade <release> -

    Search Charts - helm search - KubeApps.com (Monocular - https://github.com/helm/monocular) - Manage Chart dependencies - requirements.yaml - helm dep up - Helm Plugins - Keybase: helm keybase sign/verify - GitHub: helm github push