Add configurable gVisor (runsc) container runtime support#771
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May 14, 2026 12:56
Adds opt-in gVisor support as an additional container runtime alongside
the default containerd/runc. When enabled via:
addons:
gvisor:
enabled: true
The cluster will:
- Install runsc from the official gVisor apt repo on all nodes
- Configure containerd with the runsc runtime via config.toml.tmpl
- Apply a RuntimeClass resource (name: gvisor, handler: runsc)
Pods can then use runtimeClassName: gvisor for gVisor sandboxing.
k3s ships with containerd using the io.containerd.grpc.v1.cri plugin namespace, not io.containerd.cri.v1.runtime. The runsc config was being placed under the wrong plugin path and never picked up by containerd.
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vitobotta
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Jun 14, 2026
vitobotta
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Very good PR, thanks! Please see my comments. :)
| servicelb_enabled: @settings.addons.servicelb.enabled.to_s, | ||
| metrics_server_enabled: @settings.addons.metrics_server.enabled.to_s, | ||
| labels_and_taints: labels_and_taints, | ||
| gvisor_enabled: @settings.addons.gvisor.enabled?.to_s, |
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Nit: Move this line to before the previous so the booleans for the addons are all together.
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Closes #770
What
Adds opt-in gVisor support as an additional container runtime alongside the default containerd/runc. Managed entirely through the cluster config file.
Changes
Configuration::Models::AddonsConfig::GVisorconfig modelKubernetes::Software::GVisorinstaller (applies RuntimeClass)Usage
After cluster creation, pods can use:
Verification
crystal build --no-codegenpassescrystal tool format --checkpasses