https://github.com/rancher/rke/blob/228423358a575d0b99c23aefeaa98fc666f5f06c/cluster/plan.go#L281
@kyamazawa You are right, thank you for reporting this!
That's not a typo. The mount propagation options are private, shared, and slave, and the r prefix means recursive.
private
shared
slave
r
Sorry, but I think “/dev:/host/dev:rprivate” is right...
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@kyamazawa You are right, thank you for reporting this!