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rke2 has a config flag called

--kube-proxy-arg

. If you use that one with:

kube-proxy-arg: "proxy-mode=ipvs"

it should work

yes, in the kube-proxy container. Image has not been changed

if you do

kubectl exec -ti $KUBE-PROXY-POD-NAME -n kube-system -- modprobe --help

and replace

$KUBE-PROXY-POD-NAME

with your pod name, you get an "executable file not found in $PATH"?

That should be a non-fatal error, if you preload the correct modules and use the arg as suggested it should work. The latest release of rke2 restores modprobe to the hardened-kubernetes image to silence the warning message.