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K8s-Kata-manager

Introduction

The k8s-kata-manager project provides tools for configuring Kata runtime classes with OCI container runtimes on Kubernetes.

It allows administrators to declaratively define what runtime classes they would like to have available in their cluster. The k8s-kata-manager, running on a worker node, will download artifacts associated with each runtime class, add the runtime class to the container runtime configuration, and restart the runtime.

As an example, consider the following configuration file:

artifactsDir: /opt/nvidia/artifacts/runtimeclasses
runtimeClasses:
  - name: kata-qemu-nvidia-gpu
    artifacts:
      url: stg.nvcr.io/nvidia/cloud-native/kata-gpu-artifacts:ubuntu22.04-525
      pullSecret: my-pull-secret

A runtime class, named kata-qemu-nvidia-gpu, will be added to the OCI container runtime on the node. Artifacts associated with this kata runtime class will be pulled from the specified URL and be placed on the local filesystem under artifactsDir.

Kubernetes Deployment

Below are instructions on how to build and test the k8s-kata-manager in Kubernetes. In the Kubernetes deployment, the k8s-kata-manager will run as a Daemonset. It will read its configuration from a ConfigMap that is created as a prerequisite.

Build the container image:

make build-image

[Optional] Create a secret needed to pull the Kata artifacts:

kubectl create secret docker-registry <my-k8s-secret> --docker-server=<your-registry-server> --docker-username=<your-name> --docker-password=<your-pword> --docker-email=<your-email>

Modify the example ConfigMap as needed. Then create the ConfigMap:

kubectl create configmap kata-config --from-file=./example/config/configmap.yaml

Modify the example daemonset as needed. Then deploy k8s-kata-manager:

kubectl apply -f example/daemonset/

Create the Kubernetes RuntimeClass object:

kubectl apply -f example/runtimeclass/runtimeclass.yaml

Example output:

$ kubectl apply -f ./example/daemonset/
daemonset.apps/k8s-kata-manager created
serviceaccount/kata-manager-sa created
role.rbac.authorization.k8s.io/kata-manager-role created
rolebinding.rbac.authorization.k8s.io/kata-manager-role-binding created

$ kubectl get pods
NAME                     READY   STATUS    RESTARTS   AGE
k8s-kata-manager-ncl7f   1/1     Running   0          12s

// kata artifacts associated with the runtime class get pulled
$ ls -ltr /opt/nvidia-gpu-operator/artifacts/runtimeclasses/kata-qemu-nvidia-gpu/
total 792924
-rw-r--r-- 1 root root   6636272 Jun  1 22:54 vmlinuz-nvidia-gpu.container
-rw-r--r-- 1 root root 805306368 Jun  1 22:54 kata-ubuntu-jammy-nvidia-gpu.image
-rw-r--r-- 1 root root      2464 Jun  1 22:54 configuration-nvidia-gpu-qemu.toml

// the following entry gets added to the containerd configuration file
$ cat /etc/containerd/config.toml
. . .
        [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.kata-qemu-nvidia-gpu]
          runtime_type = "io.containerd.kata-qemu-nvidia-gpu.v2"
          privileged_without_host_devices = true
          pod_annotations = ["io.katacontainers.*"]

          [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.kata-qemu-nvidia-gpu.options]
            ConfigPath = "/opt/kata/share/defaults/kata-containers/configuration-qemu-nvidia-gpu.toml"
. . .

Local testing

A CLI tool can be used to pull artifacts and configure runtime classes on a node locally. This tool is still under development.