Chapter 12. Integrations
12.1. Integrating Serverless with the cost management service
Cost management is an OpenShift Container Platform service that enables you to better understand and track costs for clouds and containers. It is based on the open source Koku project.
12.1.1. Prerequisites
- You have cluster administrator permissions.
- You have set up cost management and added an OpenShift Container Platform source.
12.1.2. Using labels for cost management queries
Labels, also known as tags in cost management, can be applied for nodes, namespaces or pods. Each label is a key and value pair. You can use a combination of multiple labels to generate reports. You can access reports about costs by using the Red Hat hybrid console.
Labels are inherited from nodes to namespaces, and from namespaces to pods. However, labels are not overridden if they already exist on a resource. For example, Knative services have a default app=<revision_name> label:
Example Knative service default label
apiVersion: serving.knative.dev/v1
kind: Service
metadata:
name: example-service
spec:
...
labels:
app: <revision_name>
...
If you define a label for a namespace, such as app=my-domain, the cost management service does not take into account costs coming from a Knative service with the tag app=<revision_name> when querying the application using the app=my-domain tag. Costs for Knative services that have this tag must be queried under the app=<revision_name> tag.
12.1.3. Additional resources
12.2. Using NVIDIA GPU resources with serverless applications
NVIDIA supports using GPU resources on OpenShift Container Platform. See GPU Operator on OpenShift for more information about setting up GPU resources on OpenShift Container Platform.
12.2.1. Specifying GPU requirements for a service
After GPU resources are enabled for your OpenShift Container Platform cluster, you can specify GPU requirements for a Knative service using the Knative (kn) CLI.
Prerequisites
- The OpenShift Serverless Operator, Knative Serving and Knative Eventing are installed on the cluster.
-
You have installed the Knative (
kn) CLI. - GPU resources are enabled for your OpenShift Container Platform cluster.
- You have created a project or have access to a project with the appropriate roles and permissions to create applications and other workloads in OpenShift Container Platform.
Using NVIDIA GPU resources is not supported for IBM Z and IBM Power Systems.
Procedure
Create a Knative service and set the GPU resource requirement limit to
1by using the--limit nvidia.com/gpu=1flag:$ kn service create hello --image <service-image> --limit nvidia.com/gpu=1
A GPU resource requirement limit of
1means that the service has 1 GPU resource dedicated. Services do not share GPU resources. Any other services that require GPU resources must wait until the GPU resource is no longer in use.A limit of 1 GPU also means that applications exceeding usage of 1 GPU resource are restricted. If a service requests more than 1 GPU resource, it is deployed on a node where the GPU resource requirements can be met.
Optional. For an existing service, you can change the GPU resource requirement limit to
3by using the--limit nvidia.com/gpu=3flag:$ kn service update hello --limit nvidia.com/gpu=3
