docs(day-2): Operator talk

content/day-2/04_operator estensibility.md

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+---
+title: Solving Operator Extensibility: A gRPC Plugin Framework for kubernetes
+weight: 4
+tags:
+ - rejekts
+ - operatopr
+---
+
+<!-- {{% button href="https://youtu.be/rkteV6Mzjfs" style="warning" icon="video" %}}Watch talk on YouTube{{% /button %}} -->
+<!-- {{% button href="https://docs.google.com/presentation/d/1nEK0CVC_yQgIDqwsdh-PRihB6dc9RyT-" style="tip" icon="person-chalkboard" %}}Slides{{% /button %}} -->
+
+From the guys at EDB (the comercial offerin connected to CNPG).
+If you haven't hear of CNPG: Use it, please
+
+## Why
+
+- Modify beyond CRDs (Inject Sidecars, run modifications, ...)
+- Smarter reconciliation: Pause/Skip on evernal logic
+- Integrate with third party sdks (backup management, storeage, ...)
+
+## Current Options
+
+- Patch it upstream -> and hope they agree with your PR)
+- Fork it -> now you have to maintain it
+- Mutating Webhooks -> Doesn't know about the working of the operator ans just blindly forces  resource modifications
+
+## Sample Use-Case
+
+- Project: CloudNativePG
+- Goal: Extend backup functionality
+- Solution: CNPG-I (inspired by CSI)
+  - Protobuf contract
+  - Decoule of lifecycle/deplyoment: Plugins run as pods in the cnpg namespace
+  - Capability based dicovocery: Automatic registration and it will be called only if needed
+  - Orchestrated delegation: Operator is still "the brain" but can delegate
+
+TODO: Steal diagram from slides
+
+## Operator Hooks
+
+- Lifecycle: During reconcile -> Modify
+- Reconciler: Interaction during the reconciliation loop -> Stop, Requeue, Continue
+- Metrics Collection: Register additional metrics
+- Backups: Execute the backup
+- WAL Archiving: Handle WAL archiving externally