1. Auto-Scaling Inference Services with EKS Managed Node Groups


    Creating an auto-scaling inference service using Amazon EKS (Elastic Kubernetes Service) involves setting up a Kubernetes cluster with managed node groups that can automatically scale based on the computational demands of your inference workloads. Pulumi offers libraries that help you declare infrastructure as code, making it easy to define, deploy, and manage cloud resources.

    In our Pulumi program, we will do the following:

    1. Create an EKS cluster: A managed Kubernetes service that handles the complexity of running a Kubernetes control plane.
    2. Define a Managed Node Group: A group of worker nodes that are managed by AWS. These will be the compute resources where your inference services will run.
    3. Set up Auto-Scaling: Define rules and metrics that will automatically adjust the number of nodes based on the load.

    We will use the pulumi_eks library, which is a Pulumi package designed specifically to create and manage AWS EKS resources with ease. This library simplifies managing EKS clusters and their associated resources, such as node groups, with higher-level abstractions compared to using raw AWS API resources.

    Here's a Python program that illustrates how to set up an EKS cluster with managed node groups that auto-scale:

    import pulumi import pulumi_eks as eks # Create an EKS cluster. cluster = eks.Cluster('my-cluster') # Define the managed node group for the EKS cluster with auto-scaling enabled. managed_node_group = eks.ManagedNodeGroup( 'my-node-group', cluster=cluster.core, # Reference to the created EKS cluster. min_size=2, # Minimum number of nodes. max_size=5, # Maximum number of nodes. desired_capacity=3, # The initial number of nodes. instance_type='m5.large', # The instance type for each node. # You can specify other properties here, such as disk size, labels, tags, etc. ) # Export the kubeconfig to access the cluster using kubectl. pulumi.export('kubeconfig', cluster.kubeconfig)

    Breaking it down:

    • We start by importing the required pulumi and pulumi_eks libraries.
    • We instantiate a new EKS cluster using eks.Cluster. This automatically sets up the control plane, default node group, and other necessary configurations.
    • We then define a managed node group, specifying the minimum, maximum, and desired counts. This node group will be attached to the cluster we created.
    • We set an AWS EC2 instance type that will determine the computing capabilities of the nodes. Depending on your inference service's requirements, you may choose an instance type that offers GPU support, for example, p3.2xlarge for more compute-intensive machine learning workloads.
    • After all the resources are defined, we export the kubeconfig. This output provides you with the configuration information needed to connect to your cluster using kubectl, which is a command-line tool for interacting with Kubernetes clusters.

    Remember that the node group will auto-scale between the min_size and max_size based on the load and scaling policies that you can further define and attach to the node group. You would typically need to deploy your inference service as a Kubernetes deployment or stateful set and possibly use Kubernetes Horizontal Pod Autoscaler (HPA) to scale the pods based on CPU or custom metrics.

    Lastly, this program must be run with the Pulumi CLI, which will interpret the code and deploy the described resources to your AWS account. Make sure you have the appropriate AWS credentials configured where Pulumi can access them.

    To deploy your infrastructure, simply run pulumi up in the directory where this Python file is saved. The CLI will output the planned changes and ask for your confirmation before provisioning the resources in AWS.