kubernetes/cmd/kubeadm/app/cmd/phases/init/preflight.go

var preflightExample …

// NewPreflightPhase creates a kubeadm workflow phase that implements preflight checks for a new control-plane node.
func NewPreflightPhase() workflow.Phase { … }

// runPreflight executes preflight checks logic.
func runPreflight(c workflow.RunData) error { … }