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| README.md | ||
FerretDB
MongoDB wire protocol on PostgreSQL. Application Blueprint (see docs/PLATFORM-TECH-STACK.md §4.1) — installed by Organizations that want MongoDB API compatibility. Replication piggybacks on the underlying CNPG cluster (WAL streaming) — no separate replication mechanism needed.
Category: Database | Type: A La Carte (Application Blueprint)
Overview
FerretDB provides MongoDB wire protocol compatibility backed by PostgreSQL (via CNPG). Applications using MongoDB drivers connect unchanged, while data is stored in PostgreSQL with full ACID guarantees, WAL-based replication, and no SSPL license concerns.
Key Features
- MongoDB wire protocol compatibility
- PostgreSQL backend (CNPG managed)
- No SSPL license (Apache 2.0)
- WAL-based replication via CNPG (no Debezium/Kafka required)
- Full ACID transactions
Integration
| Component | Integration |
|---|---|
| CNPG | PostgreSQL backend (required dependency) |
| External Secrets (ESO) | Credential management |
| Velero | Backup via CNPG WAL archiving |
Why FerretDB (Not MongoDB)
| Aspect | MongoDB Community | FerretDB |
|---|---|---|
| License | SSPL | Apache 2.0 |
| Replication | Requires Debezium + Kafka CDC | CNPG WAL streaming (native) |
| Operational overhead | Separate operator | Uses existing CNPG |
| ACID | Limited | Full PostgreSQL ACID |
Deployment
apiVersion: kustomize.toolkit.fluxcd.io/v1
kind: Kustomization
metadata:
name: ferretdb
namespace: flux-system
spec:
interval: 10m
path: ./platform/ferretdb
prune: true
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