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Kubernetes Beyond Andrea Tosatto CODEMOTION MILAN - SPECIAL EDITION 10 – 11 NOVEMBER 2017

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KUBERNETES https:///kubernetes.io

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KUBERNETES “Production-Grade Container Orchestration” “Automated container deployment, scaling, and management” “Groups containers that make up an application into logical units for easy management and discovery” “Planet Scale” “Never Outgrow” “Run Anywhere” https:///kubernetes.io

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KUBERNETES Container DaemonSet Deployment Job Pod ReplicaSet ReplicationController StatefulSet Ingress Service ConfigMap Secret PersistentVolumeClaim Volume HorizontalPodAutoscaler PersistentVolume “Production-Grade Container Orchestration”

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KUBERNETES “Production-Grade Container Orchestration” Designed to be flexible, adapt to the specific application requirements Kubernetes is an Orchestration Framework

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WHOAMI

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BEYOND Container Runtime Interface Container Networking Interface Kubelet / KubeProxy South Bound Custom Resource Definitions kube-apiserver North Bound API Server Aggregation Additional Controllers

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BEYOND Container Runtime Interface Container Networking Interface Kubelet / KubeProxy South Bound Custom Resource Definitions kube-apiserver North Bound API Server Aggregation Additional Controllers

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MOTIVATIONS In the real world, not all the applications are cloud-native Decouple applications lifecycle management from Pods / Container Images definition Provide additional services to the infrastructure, such as Functions, Databases, Monitoring etc.

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MOTIVATIONS In the real world, not all the applications are cloud-native Decouple applications lifecycle management from Pods / Container Images definition Provide additional services to the infrastructure, such as Functions, Databases, Monitoring etc.

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MOTIVATIONS In the real world, not all the applications are cloud-native Decouple applications lifecycle management from Pods / Container Images definition Provide additional services to the infrastructure, such as Functions, Databases, Monitoring etc.

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✔ Who knows better what’s the lifecycle of an application in Production and how to deal with its state transitions? AUTOPILOT PATTERN THE INFRASTRUCTURE THE APPLICATION

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Who knows better what’s the lifecycle of an application in Production and how to deal with its state transitions? AUTOPILOT PATTERN THE INFRASTRUCTURE THE APPLICATION ✔

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AUTOPILOT PATTERN Is an approach to application and infrastructure design that pushes automation for each component of our systems into the application http://autopilotpattern.io/ States that the automation logic of an application component should be kept in the same repo with that component's code

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AUTOPILOT PATTERN Is an approach to application and infrastructure design that pushes automation for each component of our systems into the application http://autopilotpattern.io/ States that the automation logic of an application component should be kept in the same repo with that component's code

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OPERATOR An Operator is an application-specific controller that extends the Kubernetes API to create, configure and manage instances of applications on behalf of a Kubernetes user. An Operator represents human operational knowledge in software to reliably manage an application. https://coreos.com/operators

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OPERATOR An Operator is an application-specific controller that extends the Kubernetes API to create, configure and manage instances of applications on behalf of a Kubernetes user. An Operator represents human operational knowledge in software to reliably manage an application. https://coreos.com/operators

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OPERATOR CRD kube-api kubectl Infrastructure WHAT HOW Current State Desired State Controller

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OPERATOR CRD kube-api kubectl Infrastructure WHAT HOW Current State Desired State Controller

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HOW 1. Kube API Client 2. Create an Informer 3. Add an EventHandler 4. State Transaction Reconciliation Loop

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RECAP Kubernetes is meant to be easily extented beyond its standard capabilities With Kubernetes we can go beyond the infrastructure and focus on applications Kubernetes enables new orchestration / life-cycle management patterns that were not possible before

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RECAP Kubernetes is meant to be easily extented beyond its standard capabilities With Kubernetes we can go beyond the infrastructure and focus on applications Kubernetes enables new orchestration / life-cycle management patterns that were not possible before

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RECAP Kubernetes is meant to be easily extented beyond its standard capabilities With Kubernetes we can go beyond the infrastructure and focus on applications Kubernetes enables new orchestration / life-cycle management patterns that were not possible before

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RECAP Off-course, this requires some coding But in the end, we are all Developers

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THANKS @_hilbert_ atosatto #staytuned www.tosatto.me