Kubeblocks Engine Minio

MinIO Engine Entry

Use this as the primary create-time entry for MinIO. Tier-1 MinIO never falls back to kubeblocks-engine-generic.

Cold-Start Contract

• Run kubeblocks-preflight whenever the environment is not already profiled.
• Treat engine-create-matrix as the create-time truth for topology, version strategy, sizing, validation, next hops, and forbidden routes.
• Use observability-capability-matrix before promising monitoring readiness.
• Keep MinIO as object storage, not as a generic bucket service detached from storage and placement constraints.

Topology Selection

• Default topology: distributed
• distributed: the only supported Tier-1 create shape in the current truth; adjust replica count for dev/test vs production instead of inventing a different topology.
• For dev/test, the examples tolerate 2 replicas; for production, start at 4 or another even, erasure-coding-safe replica count.

ServiceVersion / Version Strategy

• Strategy: use the stable addon default from current examples unless the user explicitly pins a serviceVersion
• Current addon evidence centers on MinIO 2024-06-29T01-20-47Z.
• If the user asks for "latest", stay on an addon-backed supported line rather than a raw upstream tag.

Preflight Interpretation

• storage_class: required before apply because MinIO is storage-backed and highly sensitive to PVC behavior.
• volume_binding_mode: confirm placement and anti-affinity behavior before a multi-member distributed rollout.
• addon_readiness: MinIO addon must be installed first.
• MinIO currently has no exporter evidence in the observability truth, so do not promise scrape-ready observability by default.

Sizing Profiles

• demo: a small distributed cluster with 2 replicas for evaluation.
• production: distributed with 4 or more even replicas, anti-affinity from preflight, and storage sized for object growth.
• Treat replica count as an erasure-coding and durability decision, not just horizontal scale.

Minimal Create Path

apiVersion: apps.kubeblocks.io/v1
kind: Cluster
metadata:
  name: <cluster>
  namespace: <ns>
spec:
  terminationPolicy: Delete

• Do not leave this skill to read raw addon examples before drafting the manifest.
• Keep one name: minio component, use componentDef: minio, and set replicas: 2 only for dev/test; for production distributed quorum start at an even count of 4 or more.
• Keep optional bucket bootstrap in env MINIO_BUCKETS instead of inventing a second create path.
• Validate with kubectl apply --dry-run=server -f <minio-cluster.yaml>.
• Apply with kubectl apply -f <minio-cluster.yaml>.
• Watch kubectl get cluster <name> -n <ns> -w until the phase is Running.

Connection and Validation

• Supported connection methods: in-cluster service, port-forward
• First validation step: kubectl get cluster <name> -n <ns> and wait for Running.
• Default validation: port-forward the console or API endpoint and confirm login or bucket access.
• If the user predefines MINIO_BUCKETS, validate that initialization succeeds before handoff.

Next Hops

• Day-2 operations currently route to kubeblocks-op-lifecycle, kubeblocks-op-horizontal-scale, and kubeblocks-observability-router.
• Password and Secret handling can route to kubeblocks-manage-accounts when system accounts were customized.
• Treat kubeblocks-configure-tls as engine-specific validation work rather than a default promise.
• Do not send this path to kubeblocks-rebuild-replica; MinIO recovery should stay on troubleshoot, scale, or restore paths instead.
• Route placement, console, or S3 endpoint failures to kubeblocks-troubleshoot.

Forbidden Routes

• Never route MinIO create through kubeblocks-engine-generic.
• If the user really wants a database engine instead of object storage, switch engines before apply.

Evidence Anchors

• Use the evidence anchors below only as optional secondary evidence and parity checks after the manifest is already drafted here. A cold-start runtime should not need these files, but a stronger agent may inspect them when available.
• Current addon evidence: examples/minio/cluster.yaml.