A Deep Dive into the Operator Pattern for Non-Clustered Resources

DevOps Vienna Meetup
https://www.meetup.com/meetup-group-ziwnrlfj/events/289663295/

Transcript

1. A Deep Dive into the Operator Pattern for Non-Clustered Resources José Molero @jmlero | jose.molero@squer.at DevOps Vienna Meetup, 23.11.2022
3. Agenda Operator! But, why? Overview on Operators. Operator-SDK Deep Dive. +DEMO +DEMO +DEMO
4. Operator! But, Why?
5. Platform Infrastructure Kafka Kafka DevTeam 1 Git CRs YAML Kubernetes Kube-api Operator CRD 2 4 3 Git Repository Kubernetes components
6. DEMO 🚀 Create a kafka topic with a CR.
7. Overview on operators
8. Operator — Overview Extensibility model for CR (Custom Resources) Embed automated operations logic for CR lifecycle management Supports the Kubernetes control loop architecture
9. Operator — Reconciler apiVersion: apps/v1 kind: Deployment metadata: name: myDeployment spec: replicas: 3 … Reconcile apply Desired State Report Status Actual State Knowing the desired state Fetch the actual state Actions to go from actual to desired state
10. Operator — CRD Custom Resource Definition • Extensions of the Kubernetes API • CRDs enables Kubernetes to store our custom resource in etcd • Manage our custom resources like a built in Kubernetes resource apiVersion: cache.example.com/v1alpha1 kind: KafkaTopic metadata: name: myTopic spec: numPartitions: 5 replicationFactor: 1
11. Operator-SDK Deep-Dive
12. Operator-SDK Set of open source tools for building and packaging operators Uses controller-runtime’s Client interface • Controller Go library by the Kubernetes-sig • Kubebuilder compatible Helm, ansible and Go
13. DEMO 🌱 Create my first operator.
14. Operator-SDK with GO Operator-sdk supports the creation of operators in Go • Flexible and powerful Operator-sdk generates most of the needed skeleton code • Custom Resource Definition (CRDs) • A skeleton controller • Custom reconciliation loop to the controller https://blog.deckhouse.io/
15. DEMO 🔥 Understanding the Controller.
16. Pitfalls Implementation could become complex Manage changes/upgrades in CRD Manage the state of external resources • Caching validation • Finalizers
17. DEMO 🛳 Build and Deploy.
18. T.HANKS
19. A Deep Dive into the Operator Pattern for Non-Clustered Resources José Molero @jmlero | jose.molero@squer.at DevOps Vienna Meetup, 23.11.2022