Kubernetes for Developers - All Day DevOps

Transcript

1. Kubernetes for
   Developers
   Hossam Barakat
   Lead Consultant at Telstra Purple
   @hossambarakat_
   

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2. @hossambarakat_
   • What is Kubernetes?
   • Why Kubernetes?
   • Kubernetes Architecture
   • Deploy Web App with DB on Kubernetes
   Agenda
   

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3. @hossambarakat_
   Containers
   Hardware
   Host Operating System
   Application Application Application
   Container
   Dependencies
   Application
   Host Operating System
   Hardware
   Container Engine
   Container Container Container Container
   Hardware
   Host Operating System
   Virtual Machine
   Guest OS
   Application
   Virtual Machine
   Guest OS
   Application
   Hypervisor
   

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4. @hossambarakat_
   The application is deployed to
   production
   

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5. @hossambarakat_
   Then the application went viral
   

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6. @hossambarakat_
   Containers bring scalability challenges!
   

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7. @hossambarakat_
   Container orchestration platforms to rescue
   

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8. @hossambarakat_
   • Service discovery
   • Scaling
   • Health monitoring
   • Failover
   • Networking
   • Scheduling
   • Coordinated app upgrades
   Container Orchestration
   

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9. @hossambarakat_
   Kubernetes
   

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10. @hossambarakat_
    Kubernetes Architecture
    Master
    Worker
    Worker
    Client
    Worker
    Cluster
    

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11. @hossambarakat_
    Kubernetes Architecture
    Master
    API Server
    Scheduler
    Worker
    Kubelet
    Container Runtime
    UI (Dashboard)
    CLI (Kubectl)
    Other Client(s)
    Container Container
    Cluster
    

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12. @hossambarakat_
    ASP
    .NET App On Kubernetes
    ASP.NET
    Application
    

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13. @hossambarakat_
    ASP
    .NET App On Kubernetes
    ASP.NET
    Application
    ASP.NET
    Application
    ASP.NET
    Application
    

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14. @hossambarakat_
    Pods
    

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15. @hossambarakat_
    Pods
    Pod
    

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16. @hossambarakat_
    Pods Scaling
    Pod
    Pod
    

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17. @hossambarakat_
    Pod
    kind: Pod
    apiVersion: v1
    metadata:
    name: tasks-app
    spec:
    containers:
    - name: tasks-app
    image: hossambarakat/tasklist
    ports:
    - containerPort: 80
    $ Kubectl apply -f pod.yaml
    

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18. @hossambarakat_
    But wait… what happens if the pod dies?
    

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19. @hossambarakat_
    ReplicaSets
    Pod
    ReplicaSet
    Pod
    

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20. @hossambarakat_
    

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21. @hossambarakat_
    Deployment
    ReplicaSet
    Deployment
    Pod Pod
    

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22. @hossambarakat_
    Deployment Rollout
    Deployment
    ReplicaSet V2
    Pod Pod
    ReplicaSet V1
    Pod Pod
    

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23. @hossambarakat_
    

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24. @hossambarakat_
    Connecting to Pods
    10.0.0.1
    DB Pod A
    10.0.0.2
    DB Pod B
    ASP.NET Pod
    

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25. @hossambarakat_
    Service
    10.0.0.2
    Pod B
    10.0.0.3
    Pod C
    IP: 10.0.0.30
    DNS: myservice
    Service
    10.0.0.1
    Pod A
    

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26. @hossambarakat_
    Service
    IP: 10.0.0.30
    DNS: tasks-app-svc
    Service
    IP: 10.0.0.90
    DNS: mssql-service
    Service
    10.0.0.1
    Pod
    10.0.0.1
    Pod
    10.0.0.1
    Pod
    

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27. @hossambarakat_
    

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28. @hossambarakat_
    Kubernetes in the cloud
    

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29. Azure AKS
    $ az aks create -g myResourceGroup -n myCluster --generate-ssh-keys
    $ az aks upgrade --kubernetes-version 1.12.6 --name myCluster --resource-group
    myResourceGroup
    $ az aks scale -g myResourceGroup -n myCluster --node-count 6
    

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30. @hossambarakat_
    • Scale agent nodes based on pending pods and
    nodes utilization
    • Scans the cluster periodically to check for pending
    pods or empty nodes and increases the size if
    possible
    AKS Cluster Autoscaler
    

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31. @hossambarakat_
    • Kubernetes Architecture
    • Deploy application using different workloads
    • Kubernetes in the cloud
    Summary
    

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32. @hossambarakat_
    • https://github.com/hossambarakat/TaskList
    • Introduction to Kubernetes (edX)
    • Learn Kubernetes using Interactive Hands-on
    Scenarios (Katacoda)
    • https://kubernetes.io/docs/
    Resources
    

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33. @hossambarakat_
    Questions?
    #2019addo-cloudnative
    

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35. Thanks
    Hossam Barakat
    @hossambarakat_
    

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