Create a Ray cluster on Vertex AI

You can use the Google Cloud console or the Vertex AI SDK for Python to create a Ray cluster. A cluster can have up to 2,000 nodes. There is an upper limit of 1,000 nodes within one worker pool. There's no limit on the number of worker pools, but having a large number of worker pools, such as having 1,000 worker pools with one node each, can negatively affect cluster performance.

Before you begin, make sure to read the Ray on Vertex AI overview and set up all the prerequisite tools you need.

A Ray cluster on Vertex AI may take 10-20 minutes to start up after you create it.

import ray
import vertex_ray
from google.cloud import aiplatform
from vertex_ray import Resources

# Define a default CPU cluster, machine_type is n1-standard-16, 1 head node and 1 worker node
head_node_type = Resources()
worker_node_types = [Resources()]

# Or define a GPU cluster.
head_node_type = Resources(
  machine_type="n1-standard-16",
  node_count=1,
  custom_image="us-docker.pkg.dev/my-project/ray-custom.2-9.py310:latest",  # Optional. When not specified, a prebuilt image is used.
)

worker_node_types = [Resources(
  machine_type="n1-standard-16",
  node_count=2,  # Must be >= 1
  accelerator_type="NVIDIA_TESLA_T4",
  accelerator_count=1,
  custom_image="us-docker.pkg.dev/my-project/ray-custom.2-9.py310:latest",  # When not specified, a prebuilt image is used.
)]

aiplatform.init()
# Initialize Vertex AI to retrieve projects for downstream operations.
# Create the Ray cluster on Vertex AI
CLUSTER_RESOURCE_NAME = vertex_ray.create_ray_cluster(
  head_node_type=head_node_type,
  network=NETWORK, #Optional
  worker_node_types=worker_node_types,
  python_version="3.10",  # Optional
  ray_version="2.33",  # Optional
  cluster_name=CLUSTER_NAME, # Optional
  service_account=SERVICE_ACCOUNT,  # Optional
  enable_metrics_collection=True,  # Optional. Enable metrics collection for monitoring.
  labels=LABELS,  # Optional.

)

[Ray on Vertex AI]: Cluster State = State.PROVISIONING
Waiting for cluster provisioning; attempt 1; sleeping for 0:02:30 seconds
...
[Ray on Vertex AI]: Cluster State = State.RUNNING

Lifecycle management

During the lifecycle of a Ray cluster on Vertex AI each action is associated with a state. The billing status and management option for each state is summarized in the table below. The reference documentation provides a definition for each of these states.

Custom Image (Optional)

Prebuilt images align with most use cases. If you want to build your own image, you're encouraged to use the Ray on Vertex prebuilt images as a base image. See the Docker documentation for how to build your images from a base image.

These base images include an installation of Python, Ubuntu, and Ray. They also include dependencies such as:

• python-json-logger
• google-cloud-resource-manager
• ca-certificates-java
• libatlas-base-dev
• liblapack-dev
• g++, libio-all-perl
• libyaml-0-2.

If you want to build your own image without our base image (advanced), be sure that your image includes:

• Ray 2.33.0 or 2.9.3
• Python 3.10
• python-json-logger==2.0.7

Private and public connectivity

By default, Ray on Vertex AI creates a public, secure endpoint for interactive development with the Ray Client on Ray clusters on Vertex AI. It's recommended that you use public connectivity for development or ephemeral use cases. This public endpoint is accessible through the internet. Only authorized users who have, at a minimum, Vertex AI user role permissions on the Ray cluster's user project can access the cluster.

If you require a private connection to your cluster or if you're using VPC Service Controls, VPC peering is supported for Ray clusters on Vertex AI. Clusters with a private endpoint are only accessible from a client within a VPC network that is peered with Vertex AI.

To set up private connectivity with VPC Peering for Ray on Vertex AI, select a VPC network when you create your cluster. The VPC network requires a private services connection between your VPC network and Vertex AI. If you're using Ray on Vertex AI in the console, you can set up your private services access connection when creating the cluster.

If you want to use VPC Service Controls and VPC peering with Ray clusters on Vertex AI, there's extra setup required to use the Ray dashboard and interactive shell. Follow the instructions covered in Ray Dashboard and Interactive Shell with VPC-SC + VPC Peering to configure the interactive shell setup with VPC-SC and VPC Peering in your user project.

After you create your Ray cluster on Vertex AI, you can connect to the head node using the Vertex AI SDK for Python. The connecting environment, such as a Compute Engine VM or Vertex AI Workbench instance, must be in the VPC network that is peered with Vertex AI. Note that a private services connection has a limited number of IP addresses, which could result in IP address exhaustion. It's therefore recommended to use private connections for long-running clusters.

Private Service Connect interface for Ray on Vertex AI

Private Service Connect interface egress and Private Service Connect interface ingress are supported on Ray clusters on Vertex AI.

To use Private Service Connect interface egress, follow the instructions provided below. If VPC Service Controls is not enabled, clusters with Private Service Connect interface egress use the secure public endpoint for ingress with Ray Client.

If VPC Service Controls is enabled, Private Service Connect interface ingress is used by default with Private Service Connect interface egress. To connect with the Ray Client or submit jobs from a notebook for a cluster with Private Service Connect interface ingress, make sure that the notebook is within the user project VPC and subnetwork. For more details on how to set up VPC Service Controls, see VPC Service Controls with Vertex AI.

Enable Private Service Connect interface

Follow the setting up your resources guide to set up your Private Service Connect interface. After setting up your resources, you're ready to enable Private Service Connect interface on your Ray cluster on Vertex AI.

from google.cloud import aiplatform
import vertex_ray

# Initialization
aiplatform.init()

# Create a default cluster with network attachment configuration

psc_config = vertex_ray.PscIConfig(network_attachment=NETWORK_ATTACHMENT_NAME)
cluster_resource_name = vertex_ray.create_ray_cluster(
   psc_config=psc_config,
)

Ray Dashboard and Interactive Shell with VPC-SC + VPC Peering

1. Configure peered-dns-domains.

   {
     VPC_NAME=NETWORK_NAME
     REGION=LOCATION
     gcloud services peered-dns-domains create training-cloud \
     --network=$VPC_NAME \
     --dns-suffix=$REGION.aiplatform-training.cloud.google.com.
   
     # Verify
     gcloud beta services peered-dns-domains list --network $VPC_NAME);
   }
       

   • NETWORK_NAME: Change to peered network.

   • LOCATION: Desired location (for example, us-central1).

2. Configure DNS managed zone.

   {
     PROJECT_ID=PROJECT_ID
     ZONE_NAME=$PROJECT_ID-aiplatform-training-cloud-google-com
     DNS_NAME=aiplatform-training.cloud.google.com
     DESCRIPTION=aiplatform-training.cloud.google.com
   
     gcloud dns managed-zones create $ZONE_NAME  \
     --visibility=private  \
     --networks=https://www.googleapis.com/compute/v1/projects/$PROJECT_ID/global/networks/$VPC_NAME  \
     --dns-name=$DNS_NAME  \
     --description="Training $DESCRIPTION"
   }
       

   • PROJECT_ID: Your project ID. You can find these IDs in the Google Cloud console welcome page.

3. Record DNS transaction.

   {
     gcloud dns record-sets transaction start --zone=$ZONE_NAME
   
     gcloud dns record-sets transaction add \
     --name=$DNS_NAME. \
     --type=A 199.36.153.4 199.36.153.5 199.36.153.6 199.36.153.7 \
     --zone=$ZONE_NAME \
     --ttl=300
   
     gcloud dns record-sets transaction add \
     --name=*.$DNS_NAME. \
     --type=CNAME $DNS_NAME. \
     --zone=$ZONE_NAME \
     --ttl=300
   
     gcloud dns record-sets transaction execute --zone=$ZONE_NAME
   }
       

4. Submit a training job with the interactive shell + VPC-SC + VPC Peering enabled.

What's next

• Develop a Ray application on Vertex AI