kubernetes/cmd/kubeadm/app/preflight/checks_linux.go

// Check number of memory required by kubeadm
func (mc MemCheck) Check() (warnings, errorList []error) { … }

// addOSValidator adds a new OSValidator
func addOSValidator(validators []system.Validator, reporter *system.StreamReporter) []system.Validator { … }

// addIPv6Checks adds IPv6 related checks
func addIPv6Checks(checks []Checker) []Checker { … }

// addIPv4Checks adds IPv4 related checks
func addIPv4Checks(checks []Checker) []Checker { … }

// addSwapCheck adds a swap check
func addSwapCheck(checks []Checker) []Checker { … }

// addExecChecks adds checks that verify if certain binaries are in PATH
func addExecChecks(checks []Checker, execer utilsexec.Interface, k8sVersion string) []Checker { … }