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k0s gVisor Plugin

This repo provides a plugin "installer" for k0s to setup gVisor runtime.

It leverages the new k0s containerd plugin "framework" to dynamically configure k0s managed containerd.

Running the installer

Check the example manifest in manifests/ directory.

Essentially it runs as a DaemonSet and does the following:

  • Drops gVisor binaries into k0s bin dir at /var/lib/k0s/bin
  • Drops gVisor CRI plugin configuration into /etc/k0s/containerd.d/

Once k0s sees the drop-in configuration it will automatically reload the containerd configuration.

If you do not wish to install gVisor on all worker nodes you can customize the manifest with your own nodeSelector.

Running a pod using gVisor

You can simply create a pod using the newly installed gVisor runtime:

apiVersion: v1
kind: Pod
metadata:
  name: nginx-gvisor
spec:
  runtimeClassName: gvisor
  containers:
  - name: nginx
    image: docker.io/nginx:1-alpine

The key here is runtimeClassName: gvisor which instructs containerD to use gVisor (runsc) runtime when it creates the container.

Once the pod is running exec into the pod and check that gVisor is being used:

$ kubectl exec -it  nginx-gvisor -- dmesg
[   0.000000] Starting gVisor...

Vóila, now your Nginx is executed using gVisor.

Supported archs

Currently gVisor supports amd64 and arm64 architectures and thus this installer also supports those.