How to set default runtime (for example, nvidia) for k3s?

[npuichigo]

k3s/pkg/agent/templates/templates_linux.go

Line 39 in fe2ca9e

{{ if .NodeConfig.DefaultRuntime }}default_runtime_name = "{{ .NodeConfig.DefaultRuntime }}"{{end}}

Where does these values like .NodeConfig.DefaultRuntime and .NodeConfig.DefaultRuntime come from? Since I don't want to always specify runtimeClassName: nvidia, is there any way to specify that on installation?

[brandond]

--default-runtime value (agent/runtime) Set the default runtime in containerd

I don't believe the CLI docs on the website have been updated since we added this option, but it does show up in k3s server --help and k3s agent --help

[npuichigo]

If I don’t want to uninstall and reinstall my k3s cluster. Is there anyway to reconfigure the cluster to change default runtime?

[DavraYoung]

@npuichigo just edit the unit file on all nodes:

For server:
nano /etc/systemd/system/k3s.service

....
ExecStart=/usr/local/bin/k3s \
    server --default-runtime nvidia\

For agent:
nano /etc/systemd/system/k3s-agent.service

....
ExecStart=/usr/local/bin/k3s \
    agent --default-runtime nvidia\

[SezBulent]

FYI, after all this time the docs still haven't been updated to include this arg.

[brandond]

PR welcome @SezBulent !
https://github.com/k3s-io/docs