Horizontal Scaling for MinIO

MinIO uses distributed erasure coding and supports scale-out only. Each scale-out adds a new pool; each pool requires a minimum of 2 nodes.

CAUTION

MinIO does not support scale-in. Once nodes are added to a distributed pool, they cannot be removed. KubeBlocks blocks scale-in OpsRequests for MinIO — any attempt will remain in Running state indefinitely without removing any nodes or data.

Scale Out

Add 2 replicas (e.g., from 2 to 4):


kubectl apply -f - <<EOF
apiVersion: operations.kubeblocks.io/v1alpha1
kind: OpsRequest
metadata:
  name: minio-scale-out
  namespace: demo
spec:
  clusterName: minio-cluster
  type: HorizontalScaling
  horizontalScaling:
    - componentName: minio
      scaleOut:
        replicaChanges: 2
EOF

Monitor progress:

kubectl get opsrequest minio-scale-out -n demo -w

Example Output

NAME              TYPE                CLUSTER         STATUS    PROGRESS   AGE
minio-scale-out   HorizontalScaling   minio-cluster   Succeed   2/2        2m

Cleanup

kubectl delete opsrequest minio-scale-out -n demo --ignore-not-found