Connect to an existing Parallelstore instance from Google Kubernetes Engine

This guide describes how you can connect to an existing Parallelstore instance with the GKE Parallelstore CSI driver with static provisioning. This lets you access existing fully managed Parallelstore instances as volumes for your stateful workloads, in a controlled and predictable way.

Before you begin

Before you start, make sure you have performed the following tasks:

• Enable the Parallelstore API and the Google Kubernetes Engine API.
Enable APIs
• If you want to use the Google Cloud CLI for this task, install and then initialize the gcloud CLI. If you previously installed the gcloud CLI, get the latest version by running gcloud components update.

• See the CSI driver overview for limitations and requirements.
• Create a Parallelstore instance if you haven't done so already.
• Configure a VPC network.
• If you want to use a GKE Standard cluster, make sure to enable the CSI driver.

Access an existing Parallelstore instance using the Parallelstore CSI driver

If you have already provisioned a Parallelstore instance within the same network as your GKE cluster, you can follow these instructions to statically provision a PersistentVolume that refers to your instance.

The following sections describe the typical process for accessing an existing Parallelstore instance using the Parallelstore CSI driver:

1. Create a PersistentVolume that refers to the Parallelstore instance..
2. Use a PersistentVolumeClaim to access the volume.
3. (Optional) Configure resources for the sidecar container.
4. Create a workload that consumes the volume.

Create a PersistentVolume

This section shows an example of how you can create a PersistentVolume that references an existing Parallelstore instance.

1. Run the following command to locate your Parallelstore instance.

   gcloud beta parallelstore instances list \
       --project=PROJECT_ID \
       --location=LOCATION
   

   Replace the following:

   • PROJECT_ID: the Google Cloud project ID.
   • LOCATION: the Compute Engine zone containing the cluster. You must specify a supported zone for the Parallelstore CSI driver.

   The output should look similar to the following. Make sure to note down the Parallelstore instance name and the IP access points, before you proceed to the next step.

   NAME                                                                                                     capacity  DESCRIPTION  CREATE_TIME                     UPDATE_TIME                     STATE   network  RESERVED_IP_RANGE  ACCESS_POINTS
   projects/my-project/locations/us-central1-a/instances/pvc-eff1ed02-a8ed-48d2-9902-bd70a2d60563  12000                  2024-03-06T19:18:26.036463730Z  2024-03-06T19:24:44.561441556Z  ACTIVE                              10.51.110.2,10.51.110.4,10.51.110.3
   

2. Save the following manifest in a file named parallelstore-pv.yaml:

   apiVersion: v1
   kind: PersistentVolume
   metadata:
     name: parallelstore-pv
   spec:
     storageClassName: "STORAGECLASS_NAME"
     capacity:
       storage: STORAGE_SIZE
     accessModes:
       - ReadWriteMany
     persistentVolumeReclaimPolicy: Retain
     volumeMode: Filesystem
     csi:
       driver: parallelstore.csi.storage.gke.io
       volumeHandle: "PROJECT_ID/LOCATION/INSTANCE_NAME/default-pool/default-container"
       volumeAttributes:
         accessPoints: ACCESS_POINTS
         network: NETWORK_NAME
     claimRef:
       name: parallelstore-pvc
       namespace: default
   

   Replace the following:

   • PROJECT_ID: the Google Cloud project ID
   • LOCATION: the zonal location of your Parallelstore instance. You must specify a supported zone for the Parallelstore CSI driver.
   • INSTANCE_NAME: the name of your Parallelstore instance. An example of a valid volumeHandle value is "my-project/us-central1-a/pvc-eff1ed02-a8ed-48d2-9902-bd70a2d60563/default-pool/default-container".
   • ACCESS_POINTS: the access points of your Parallelstore instance; for example, 10.51.110.2,10.51.110.4,10.51.110.3.
   • NETWORK_NAME: the VPC network where your Parallelstore instance can be accessed.
   • STORAGECLASS_NAME: the name of your StorageClass. This can be an empty string, but must match the specification in your PersistentVolumeClaim.
   • STORAGE_SIZE: the storage size; for example, 12000Gi.

   For the full list of fields supported in the PersistentVolume object, refer to the Parallelstore CSI reference documentation.

3. Create the PersistentVolume by running this command:

   kubectl apply -f parallelstore-pv.yaml
   

Use a PersistentVolumeClaim to access the volume

You can create a PersistentVolumeClaim resource that references the Parallelstore CSI driver's StorageClass.

The following manifest file shows an example of how to create a PersistentVolumeClaim in ReadWriteMany access mode that references the StorageClass you created earlier.

1. Save the following manifest in a file named parallelstore-pvc.yaml:

     kind: PersistentVolumeClaim
     apiVersion: v1
     metadata:
       name: parallelstore-pvc
       namespace: default
     spec:
       accessModes:
         - ReadWriteMany
       storageClassName: STORAGECLASS_NAME
       resources:
         requests:
           storage: STORAGE_SIZE
   

   Replace the following:

   • STORAGECLASS_NAME: the name of your StorageClass. It must match the specification in your PersistentVolume.
   • STORAGE_SIZE: Storage size; for example, 12000Gi. It must match the specification in your PersistentVolume.

2. Create the PersistentVolumeClaim by running this command:

     kubectl create -f parallelstore-pvc.yaml
   

(Optional) Configure resources for the sidecar container

When you create a workload Pod that uses Parallelstore-backed volumes, the CSI driver determines whether your volume is based on Parallelstore instances.

If the driver detects that your volume is Parallelstore-based, or if you specify the annotation gke-parallelstore/volumes: "true", the CSI driver automatically injects a sidecar container named gke-parallelstore-sidecar into your Pod. This sidecar container mounts the Parallelstore instance to your workload.

By default, the sidecar container is configured with the following resource requests, with resource limits unset:

• 250 m CPU
• 512 MiB memory
• 10 MiB ephemeral storage

To overwrite these values, you can optionally specify the annotation gke-parallelstore/[cpu-request|memory-request|cpu-limit|memory-limit|ephemeral-storage-request] as shown in the following example:

apiVersion: v1
kind: Pod
metadata:
  annotations:
    gke-parallelstore/volumes: "true"
    gke-parallelstore/cpu-request: 500m
    gke-parallelstore/memory-request: 1Gi
    gke-parallelstore/ephemeral-storage-request: 500Mi
    gke-parallelstore/cpu-limit: 1000m
    gke-parallelstore/memory-limit: 2Gi
    gke-parallelstore/ephemeral-storage-limit: 1Gi

Use the following considerations when deciding the amount of resources to allocate:

• If one of the request or limit values is set and another is unset, GKE sets them both to the same, specified value.
• Allocate more CPU to the sidecar container if your workloads need higher throughput. Insufficient CPU will cause I/O throttling.
• You can use value "0" to unset any resource limits on Standard clusters; for example, gke-parallelstore/memory-limit: "0" removes the memory limit for the sidecar container. This is useful when you cannot decide on the amount of resources gke-parallelstore-sidecar needs for your workloads, and want to let the sidecar consume all the available resources on a node.

Create a workload that consumes the volume

This section shows an example of how to create a Pod that consumes the PersistentVolumeClaim resource you created earlier.

Multiple Pods can share the same PersistentVolumeClaim resource.

1. Save the following manifest in a file named my-pod.yaml.

     apiVersion: v1
     kind: Pod
     metadata:
       name: my-pod
     spec:
       containers:
       - name: nginx
         image: nginx
         volumeMounts:
           - name: parallelstore-volume
             mountPath: /data
       volumes:
       - name: parallelstore-volume
         persistentVolumeClaim:
           claimName: parallelstore-pvc
   

2. Run the following command to apply the manifest to the cluster:

     kubectl apply -f my-pod.yaml
   

   The Pod waits until GKE provisions the PersistentVolumeClaim before it starts running. This operation might take several minutes to complete.

Manage the Parallelstore CSI driver

This section covers how you can enable and disable the Parallelstore CSI driver, if needed.

Enable the Parallelstore CSI driver on a new cluster

To enable the Parallelstore CSI driver when creating a new Standard cluster, run the following command with the Google Cloud CLI:

gcloud container clusters create CLUSTER_NAME \
    --location=LOCATION \
    --network=NETWORK_NAME \
    --addons=ParallelstoreCsiDriver \
    --cluster-version=VERSION

Replace the following:

• CLUSTER_NAME: the name of your cluster.
• LOCATION: the Compute Engine zone containing the cluster. You must specify a supported zone for the Parallelstore CSI driver.
• NETWORK_NAME: name of the VPC network you created in Configure a VPC network.
• VERSION: the GKE version number. You must specify a supported version number to use this feature, such as GKE version 1.29 or later. Alternatively, you can use the --release-channel flag and specify a release channel.

Enable the Parallelstore CSI driver on an existing cluster

To enable the driver on an existing GKE Standard cluster, run the following command with the Google Cloud CLI:

gcloud container clusters update CLUSTER_NAME \
  --location=LOCATION \
  --update-addons=ParallelstoreCsiDriver=ENABLED

Replace the following:

• CLUSTER_NAME : the name of your cluster.
• LOCATION: the Compute Engine zone containing the cluster. You must specify a supported zone for the Parallelstore CSI driver.

Make sure that your GKE cluster is running in the same VPC network that you set up in Configure a VPC network. To verify the VPC network for a GKE cluster, you can check in the Google Cloud console, or through the command gcloud container clusters describe $(CLUSTER) --format="value(networkConfig.network)" --location=$(LOCATION).

Disable the Parallelstore CSI driver

You can disable the Parallelstore CSI driver on an existing Autopilot or Standard cluster by using the Google Cloud CLI.

gcloud container clusters update CLUSTER_NAME \
    --location=LOCATION \
    --update-addons=ParallelstoreCsiDriver=DISABLED

Replace the following:

• CLUSTER_NAME : the name of your cluster.
• LOCATION: the Compute Engine zone containing the cluster. You must specify a supported zone for the Parallelstore CSI driver.

Use fsGroup with Parallelstore volumes

The Parallelstore CSI driver supports changing the group ownership of the root level directory of the mounted file system to match a user-requested fsGroup specified in the Pod's SecurityContext. This feature is only supported in GKE clusters version 1.29.5 or later, or version 1.30.1 or later.

Troubleshooting

For troubleshooting guidance, refer to the Troubleshooting page in the Parallelstore documentation.

What's next

• Explore the Parallelstore CSI reference documentation.
• Learn how to use the Parallelstore interception library to improve workload performance.
• Learn how to transfer data to Parallelstore from Cloud Storage.
• Learn how to use the GKE Volume Populator to automate data transfer from a Cloud Storage bucket source storage to a destination PersistentVolumeClaim backed by a Parallelstore instance.
• Try the tutorial to train a TensorFlow model with Keras on GKE.