An AppWrapper contains a collection of Kubernetes resources that a
user desires to manage as a single logical workload. AppWrappers are
designed to smoothly interoperate with
Kueue. They provide a flexible and
workload-agnostic mechanism for enabling Kueue to manage a group of
Kubernetes resources as a single logical unit without requiring any
Kueue-specific support by the controllers of those resources.
Kueue can be configured to recognize AppWrappers as an
externalFramework,
thus ensuring that if you have enabled Kueue's manageJobsWithoutQueueName
option, admission decisions made for the AppWrapper will be properly
propagated to its contained resources.
For a more detailed description of the overall design, see the
Architecture
section of our website.
AppWrappers are designed to harden workloads by providing an additional level of automatic fault detection and recovery. The AppWrapper controller monitors the health of the workload and if corrective actions are not taken by the primary resource controllers within specified deadlines, the AppWrapper controller will orchestrate workload-level retries and resource deletion to ensure that either the workload returns to a healthy state or is cleanly removed from the cluster and its quota freed for use by other workloads. If Autopilot is also being used on the cluster, the AppWrapper controller can be configured to automatically inject Node anti-affinities into Pods and to trigger retries when Pods in already running workloads are using resources that Autopilot has tagged as unhealthy. For details on customizing and configuring these fault tolerance capabilities, please see the Fault Tolerance section of our website.
AppWrappers are designed to be used as part of fully open source software stack to run production batch workloads on Kubernetes and OpenShift. The MLBatch project leverages Kueue, the Kubeflow Training Operator, KubeRay, and the Codeflare Operator from Red Hat OpenShift AI. MLBatch enables AppWrappers and adds Coscheduler. MLBatch includes a number of configuration steps to help these components work in harmony and support large workloads on large clusters.
To install the latest release of AppWrapper in a Kubernetes cluster with Kueue already installed and configured, simply run the command:
kubectl apply --server-side -f https://github.com/project-codeflare/appwrapper/releases/download/v0.27.0/install.yamlThe controller runs in the appwrapper-system namespace.
Read the Quick Start Guide to learn more.
If you have modified the default configuration of Kueue to set manageJobsWithoutQueueName to true,
then you must also apply this patch to your
Kueue installation.
For example of AppWrapper usage, browse our Samples directory or see the Samples section of the project website.
To contribute to the AppWrapper project and for detailed instructions on how to build and deploy the project from source, see the Development Setup section of the project website.
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