Intro to Operators in Kubernetes

Overview do funcionamento da API do Kubernetes. Introdução a criação de operators, casos de uso e um demo de operator.

Transcript

1. Intro to KUBERNETES OPERATORS
2. Carol Valencia Devops Engineering
3. Kubernetes Operators Demo Agenda 3
4. 1. Overview Kubernetes
5. 5 Kubernetes API Server
6. Kubernetes Components 6 Figure by Improving your Kubernetes Workload Security with Hardware Virtualization
7. 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
8. 8 Kubernetes API Request flow
9. Kubernetes API Resources 9
11. 2. Operators Kubernetes
12. 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
13. 13 Figure -https://blog.couchbase.com/kubernetes-operators-game-changer/
14. Operator - Method of packaging, deploying and managing a Kubernetes application - Custom controller that works with custom resources of a certain kind 14
15. 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
16. Community Operators 16 Figure -https://commons.openshift.org/sig/OpenshiftOperators.html
17. Custom Resource 17 you store and retrieve structured data
18. Custom Controller 18 Reconciliation: • Observe current state • Analyse and compare against declared state • Bring current state closer to declared state
19. Operator Custom Resource + Custom Controller
20. 3. Demo Weather operator
21. Operator SDK 21 Figure -https://coreos.com/operators/
22. 22 https://github.com/krol3/weather-operator/blob/master/demo/demo-operators.mov
23. Resources ▪ https://book.kubebuilder.io/ ▪ https://github.com/operator-fram ework/operator-sdk 23 ▪ Demo: https://github.com/krol3/weather-operator
24. Thanks! Any questions? You can find me at: guillen.carolina@gmail.com Github: krol3 linkedin.com/in/carolgv 24