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GitHub - stevefan1999-personal/surrealdb-operator
stevefan1999 · 2026-04-29 · via Hacker News: Show HN

A Kubernetes operator for managing SurrealDB clusters, built with KubeOps (.NET 10).

Overview

The SurrealDB Operator manages the full lifecycle of SurrealDB clusters on Kubernetes: deployment, storage backend provisioning (TiKV, RocksDB, or in-memory), scaling, TLS via cert-manager, and automated backups via Velero.

┌──────────────────────────────────────────────────────────┐
│                    Kubernetes Cluster                     │
│                                                          │
│  ┌───────────────────────┐   ┌────────────────────────┐  │
│  │  SurrealDB Operator   │   │   TiDB Operator (ext)  │  │
│  │  ┌─────────────────┐  │   │   Manages TiKV/PD      │  │
│  │  │  Cluster Ctrl   │──┼───►   StatefulSets         │  │
│  │  ├─────────────────┤  │   └────────────────────────┘  │
│  │  │  Backup Ctrl    │──┼──►                            │
│  │  └─────────────────┘  │   ┌────────────────────────┐  │
│  └───────────────────────┘   │   Velero (ext)         │  │
│                              │   Backup / Schedule /  │  │
│                              │   Restore / BSL        │  │
│  ┌───────────┐ ┌───────────┐ └────────────────────────┘  │
│  │ SurrealDB │ │ SurrealDB │                              │
│  │ Pod       │ │ Pod       │  tikv://pd:2379             │
│  └─────┬─────┘ └─────┬─────┘                             │
│        └──────┬───────┘                                  │
│  ┌────────────▼───────────────────────┐                  │
│  │  PD StatefulSet + TiKV StatefulSet │                  │
│  └────────────────────────────────────┘                  │
└──────────────────────────────────────────────────────────┘

Features

  • Declarative SurrealDB clusters — one CR manages Deployment, Service, and ServiceAccount
  • Multiple storage backendsmemory (dev/test), tikv (production), rocksdb (single-node)
  • TiKV coordination — creates and manages Cluster, PDGroup, and TiKVGroup CRs via TiDB Operator v2
  • Horizontal scaling — update spec.surrealdb.replicas to scale SurrealDB nodes
  • Automated backups — Velero-backed BackupDestination / Backup / BackupSchedule / Restore CRDs with GFS retention and live data round-trip
  • Ingress support — optional Ingress creation with TLS
  • Health status — Kubernetes-standard conditions (Ready, Synchronizing, Complete, DataVerified, Failed)
  • Admission webhooks — dependency pre-checks deny invalid resources at admission time (missing TiDB Operator, Velero, cert-manager, or secrets) with clear error messages
  • Multi-arch containerlinux/amd64 and linux/arm64 images published to GHCR

Prerequisites

Component Version Required?
Kubernetes 1.28+ Yes
TiDB Operator 2.0+ For tikv backend
Velero 1.18+ For backups (Backup / BackupSchedule / Restore); install with just velero-install
cert-manager 1.13+ For managed TLS certificates (spec.tls.issuerRef)
just 1.0+ For development task runner

Installation

1. Install CRDs

kubectl apply -f https://github.com/stevefan1999-personal/surrealdb-operator/releases/latest/download/surrealdbcluster-crd.yaml

Or from a local clone:

kubectl apply -f deploy/crds/surrealdbcluster-crd.yaml

2. Deploy the operator

# Development (single replica, minimal resources)
kubectl apply -k deploy/kustomize/base

# Production (2 replicas, higher resource limits)
kubectl apply -k deploy/kustomize/overlays/production

3. Create a SurrealDbCluster

kubectl apply -f - <<'EOF'
apiVersion: surrealdb.io/v1alpha1
kind: SurrealDbCluster
metadata:
  name: my-cluster
  namespace: default
spec:
  surrealdb:
    replicas: 1
    image:
      repository: surrealdb/surrealdb
      tag: v3.0.5
    port: 8000
    logLevel: info
    auth:
      rootUsername: root
      rootPasswordSecretRef:
        name: surrealdb-root-password
        key: password
  storage:
    backend: memory
  service:
    type: ClusterIP
    port: 8000
EOF

Usage Examples

Production cluster with TiKV

apiVersion: surrealdb.io/v1alpha1
kind: SurrealDbCluster
metadata:
  name: prod-cluster
  namespace: surrealdb
spec:
  surrealdb:
    replicas: 3
    image:
      repository: surrealdb/surrealdb
      tag: v3.0.5
    logLevel: warn
    auth:
      rootUsername: root
      rootPasswordSecretRef:
        name: surrealdb-root-password
        key: password
    resources:
      requests:
        cpu: 500m
        memory: 512Mi
      limits:
        cpu: "2"
        memory: 2Gi

  storage:
    backend: tikv
    tikv:
      pdReplicas: 3
      tikvReplicas: 3
      pdStorage:
        storageClassName: fast-ssd
        size: 1Gi
      tikvStorage:
        storageClassName: fast-ssd
        size: 50Gi

  service:
    type: ClusterIP
    port: 8000

Backups are configured separately via BackupDestination and BackupSchedule CRDs — see Backup System below.

Check cluster status

kubectl get surrealdbcluster my-cluster
kubectl describe surrealdbcluster my-cluster

Configuration Reference

spec.surrealdb

Field Type Default Description
replicas integer 1 Number of SurrealDB pods
image.repository string surrealdb/surrealdb Container image repository
image.tag string v3.0.5 Container image tag
image.pullPolicy string IfNotPresent Image pull policy
port integer 8000 SurrealDB listen port
logLevel string info Log level (none/error/warn/info/debug/trace)
auth.rootUsername string root SurrealDB root username
auth.rootPasswordSecretRef object Secret reference for root password. Optional — if omitted, the operator auto-generates a {cluster}-auth Secret
resources object CPU/memory requests and limits

Auto-generated root credentials

spec.surrealdb.auth.rootPasswordSecretRef is optional. When omitted, the operator automatically creates a Secret named {cluster}-auth containing a cryptographically random 32-character password. This follows the same pattern used by CloudNativePG: credentials are generated once on first reconcile and never rotated by the operator.

The auto-generated Secret has two keys:

Key Value
username root
password random 32-char alphanumeric string

To retrieve the generated password:

kubectl get secret my-cluster-auth -o jsonpath='{.data.password}' | base64 -d

The secret name is also recorded in the cluster status for discovery:

kubectl get surrealdbcluster my-cluster -o jsonpath='{.status.auth.generatedSecretName}'

spec.storage

Field Type Default Description
backend string memory Storage backend: memory, tikv, or rocksdb
tikv.pdReplicas integer 3 PD replicas (TiKV backend)
tikv.tikvReplicas integer 3 TiKV replicas
tikv.pdStorage.size string 1Gi PD persistent volume size
tikv.tikvStorage.size string 10Gi TiKV persistent volume size
persistence.enabled boolean false Enable PVC for rocksdb backend
persistence.size string 10Gi PVC size for rocksdb backend

spec.service

Field Type Default Description
type string ClusterIP Kubernetes Service type: ClusterIP, NodePort, or LoadBalancer
port integer 8000 Service port (forwards to SurrealDB container port)

Use ClusterIP for internal access (expose via Ingress or kubectl port-forward). Use NodePort for dev/test clusters without a load-balancer controller. Use LoadBalancer on cloud clusters with a cloud load-balancer provider.

spec.ingress

Field Type Default Description
enabled boolean false Create an Ingress resource
className string ingressClassName (e.g. nginx, traefik)
hosts[*].host string Virtual hostname
hosts[*].paths[*].path string / URL path prefix
hosts[*].paths[*].pathType string Prefix Path match type (Prefix or Exact)
tls[*].secretName string TLS Secret name for this host group
tls[*].hosts array Hostnames covered by the TLS certificate

The operator updates the Ingress on every reconcile to reflect spec changes. Both Service and Ingress carry owner references and are garbage-collected when the cluster is deleted.

spec.tls

Field Type Default Description
enabled boolean false Enable TLS for the SurrealDB port
issuerRef.name string Name of the cert-manager Issuer or ClusterIssuer
issuerRef.kind string ClusterIssuer Issuer (namespaced) or ClusterIssuer (cluster-wide)
secretName string {cluster}-tls Secret containing tls.crt / tls.key. Auto-generated by cert-manager when issuerRef is set; pre-existing in BYO mode
dnsNames array [{cluster}-surrealdb.{ns}.svc.cluster.local] DNS SANs for the Certificate CR

When issuerRef is set the operator creates a cert-manager Certificate CR owned by the cluster. When it is absent the operator expects the Secret to already exist (BYO mode).

When TLS is enabled, --web-crt and --web-key are automatically added to the SurrealDB start arguments and the TLS Secret is mounted at /etc/surrealdb/tls/ in the pod.

When both TLS and Ingress are enabled with a ClusterIssuer, the annotation cert-manager.io/cluster-issuer is automatically added to the Ingress.

TLS setup example

# 1. Install cert-manager (if not already installed)
kubectl apply -f https://github.com/cert-manager/cert-manager/releases/latest/download/cert-manager.yaml

# 2. Create a self-signed ClusterIssuer (for development / testing)
kubectl apply -f - <<'EOF'
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
  name: selfsigned-issuer
spec:
  selfSigned: {}
EOF

# 3. Create a SurrealDbCluster with TLS enabled
kubectl apply -f - <<'EOF'
apiVersion: surrealdb.io/v1alpha1
kind: SurrealDbCluster
metadata:
  name: my-cluster
  namespace: default
spec:
  surrealdb:
    replicas: 1
  storage:
    backend: memory
  tls:
    enabled: true
    issuerRef:
      name: selfsigned-issuer
      kind: ClusterIssuer
EOF

Backup System

Backups are configured via three independent CRDs rather than spec.backup on the cluster:

BackupDestination — wraps a Velero BackupStorageLocation:

Field Type Default Description
spec.provider string aws Velero object-store provider (works for any S3-compatible endpoint)
spec.bucket string S3 bucket name (required)
spec.prefix string Optional key prefix inside the bucket
spec.config map<string,string> Provider config (e.g. region, s3ForcePathStyle, s3Url)
spec.credentialSecretRef.name string Secret containing the AWS-style credentials file
spec.credentialSecretRef.key string Key inside the Secret holding the credentials body
spec.backupSyncPeriod string 1m Velero BSL sync cadence (Go duration)

Backup — a single backup instance:

Field Type Description
spec.clusterRef.name string Name of the SurrealDbCluster to back up
spec.destinationRef.name string Name of the BackupDestination
spec.expiresAt datetime When this backup expires (null = keep forever)
spec.retentionPolicy string soft (GFS-managed) or hard (kept until expiresAt)
status.phase string WaitingInProgressActiveExpired | Failed

BackupSchedule — cron-based trigger with GFS retention:

Field Type Default Description
spec.clusterRef.name string SurrealDbCluster to back up
spec.destinationRef.name string Target BackupDestination
spec.schedule string 0 2 * * * Cron expression (UTC)
spec.retain.last integer Always keep last N backups
spec.retain.daily integer Keep one per day for N days
spec.retain.weekly integer Keep one per week for N weeks
spec.retain.monthly integer Keep one per month for N months
spec.retain.yearly integer Keep one per year for N years
spec.hardRetentionLimit integer 50 Absolute max total Backup CRs; triggers GC

See samples/deploy/examples/10-backup-destination-s3.yaml, 11-backup-manual.yaml, and 12-backup-schedule-multi-tier.yaml for complete examples.

Admission Webhooks

The operator registers four ValidatingAdmissionWebhook endpoints that run before any resource is admitted to the cluster. This provides fast, clear feedback when a prerequisite is missing rather than leaving a resource stuck in a failed reconcile loop.

What you try to create Missing dependency Error you'll see
SurrealDbCluster with storage.backend: tikv TiDB Operator v2 not installed TiDB Operator v2 is not installed. Install tidb-operator v2 before using storage.backend=tikv.
SurrealDbCluster with tls.issuerRef set cert-manager not installed cert-manager is not installed. Install cert-manager before using spec.tls.issuerRef.
Backup / BackupSchedule / Restore Velero not installed Velero is not installed. Run 'just velero-install' before creating backup CRs.
Backup BackupDestination not ready BackupDestination 'my-dest' is not ready.
Backup with storage.backend: memory Cannot backup memory backend.
BackupDestination Credential secret missing Secret 'my-creds' not found in namespace 'default'.
BackupDestination spec.bucket empty spec.bucket is required.

Note: The webhooks require HTTPS. KubeOps generates a self-signed TLS certificate for the webhook server automatically — no cert-manager installation is needed for the webhook TLS itself.

Development

Prerequisites

  • .NET 10 SDK
  • just task runner
  • Docker (for container publish)
  • kubectl + a local Kubernetes cluster (k0s, kind, or minikube)

Available recipes

$ just --list
Available recipes:
    build                 # Build the operator
    clean                 # Clean build artifacts
    demo endpoint username password # Run the demo console app
    deploy                # Deploy operator via kustomize base
    deploy-crds           # Apply CRD manifests to the cluster
    deploy-local          # Deploy operator via local overlay (for local development)
    gen-crds              # Generate CRD YAML via KubeOps CLI; keeps only our CRD, discards external stubs
    lint                  # Run code formatting/analyzer lint checks
    publish tag           # Publish operator container image for a single arch (amd64)
    publish-multiarch tag # Publish multi-arch operator image (amd64 + arm64 manifest)
    restore               # Restore NuGet packages
    run                   # Run the operator locally against the k0s cluster
    test                  # Run all tests (unit + integration + e2e)
    test-e2e              # Run backup/restore e2e tests against the local k0s cluster
    test-integration      # Run operator integration tests against the local k0s cluster
    test-operator         # Alias for test-integration
    test-unit             # Run all unit tests

Build and test

just restore    # restore NuGet packages
just lint       # verify dotnet formatting/analyzers
just build      # compile
just test-unit  # unit tests (no cluster needed)
just test       # all tests including integration/e2e (requires k0s/k3s + dependencies)

Regenerate CRDs

After modifying SurrealDbCluster.cs schema fields, regenerate the CRD manifest:

just gen-crds

This restores the KubeOps CLI tool, invokes dotnet kubeops generate crds, and copies the result to deploy/crds/surrealdbcluster-crd.yaml.

Publish container image locally

just publish dev

The container is published using dotnet publish with EnableSdkContainerSupport — no Dockerfile required.

Run against a cluster

just run   # uses KUBECONFIG=/var/lib/k0s/pki/admin.conf

Contributing

  1. Fork the repository
  2. Create a feature branch (git checkout -b feat/my-feature)
  3. Make changes following the conventions in CLAUDE.md
  4. Run lint and tests: just lint && just test-unit
  5. Commit with conventional commits (feat:, fix:, refactor:, etc.)
  6. Open a pull request

See ARCHITECTURE.md and DESIGN.md for architectural context.