Intro to Operators in Kubernetes

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Intro to KUBERNETES OPERATORS

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Carol Valencia Devops Engineering

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Kubernetes Operators Demo Agenda 3

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1. Overview Kubernetes

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5 Kubernetes API Server

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Kubernetes Components 6 Figure by Improving your Kubernetes Workload Security with Hardware Virtualization

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Basic components in Kubernetes Pod: Smallest unit of work - the smallest deployable object in the Kubernetes object model - Can hold one or more containers Deployment: Controller for Pods and ReplicaSets - Great for stateless apps, like restful Api - Scaling of the pods StatefulSet: Controller for manage stateful applications - Maintain order, sticky identity, no interchangeability of the Pods 7

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8 Kubernetes API Request flow

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Kubernetes API Resources 9

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2. Operators Kubernetes

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12 Timeline - Kubernetes Custom Resources - CR - Kubernetes Custom Resource Definitions - CRD ~ StatefulSet or Deployment - Kubernetes 1.7 - Custom Controllers - Operator SDK - 2018 - CoreOS - RedHat - IBM

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13 Figure -https://blog.couchbase.com/kubernetes-operators-game-changer/

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Operator - Method of packaging, deploying and managing a Kubernetes application - Custom controller that works with custom resources of a certain kind 14

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15 Operator uses In a context of an application, we have some Operational knowledge baked in and automated ● Handling upgrades from one version to another ● Handling complex failure recovery scenarios ● Scaling a stateful application up and down ● Best suited for complex and stateful services

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Community Operators 16 Figure -https://commons.openshift.org/sig/OpenshiftOperators.html

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Custom Resource 17 you store and retrieve structured data

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Custom Controller 18 Reconciliation: ● Observe current state ● Analyse and compare against declared state ● Bring current state closer to declared state

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Operator Custom Resource + Custom Controller

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3. Demo Weather operator

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Operator SDK 21 Figure -https://coreos.com/operators/

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22 https://github.com/krol3/weather-operator/blob/master/demo/demo-operators.mov

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Resources ■ https://book.kubebuilder.io/ ■ https://github.com/operator-fram ework/operator-sdk 23 ■ Demo: https://github.com/krol3/weather-operator

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Thanks! Any questions? You can find me at: guillen.carolina@gmail.com Github: krol3 linkedin.com/in/carolgv 24