diff --git a/cmd/kubeadm/app/cmd/upgrade/node.go b/cmd/kubeadm/app/cmd/upgrade/node.go
index ad7e8a83bfe..81e355f8276 100644
--- a/cmd/kubeadm/app/cmd/upgrade/node.go
+++ b/cmd/kubeadm/app/cmd/upgrade/node.go
@@ -38,14 +38,12 @@ import (
 // Please note that this structure includes the public kubeadm config API, but only a subset of the options
 // supported by this api will be exposed as a flag.
 type nodeOptions struct {
-	kubeConfigPath   string
-	kubeletVersion   string
-	advertiseAddress string
-	nodeName         string
-	etcdUpgrade      bool
-	renewCerts       bool
-	dryRun           bool
-	kustomizeDir     string
+	kubeConfigPath string
+	kubeletVersion string
+	etcdUpgrade    bool
+	renewCerts     bool
+	dryRun         bool
+	kustomizeDir   string
 }
 
 // compile-time assert that the local data object satisfies the phases data interface.
diff --git a/cmd/kubeadm/app/phases/certs/renewal/manager.go b/cmd/kubeadm/app/phases/certs/renewal/manager.go
index aace4933e0e..dabd3616036 100644
--- a/cmd/kubeadm/app/phases/certs/renewal/manager.go
+++ b/cmd/kubeadm/app/phases/certs/renewal/manager.go
@@ -257,6 +257,9 @@ func (rm *Manager) CreateRenewCSR(name, outdir string) error {
 
 	// generates the CSR request and save it
 	csr, key, err := pkiutil.NewCSRAndKey(cfg)
+	if err != nil {
+		return errors.Wrapf(err, "failure while generating %s CSR and key", name)
+	}
 	if err := pkiutil.WriteKey(outdir, name, key); err != nil {
 		return errors.Wrapf(err, "failure while saving %s key", name)
 	}
diff --git a/cmd/kubeadm/app/preflight/checks.go b/cmd/kubeadm/app/preflight/checks.go
index 3fe62d2b208..1f6c2a605c8 100644
--- a/cmd/kubeadm/app/preflight/checks.go
+++ b/cmd/kubeadm/app/preflight/checks.go
@@ -213,7 +213,7 @@ func (poc PortOpenCheck) Check() (warnings, errorList []error) {
 		}
 	}
 
-	return nil, errorList
+	return warnings, errorList
 }
 
 // IsPrivilegedUserCheck verifies user is privileged (linux - root, windows - Administrator)
diff --git a/cmd/kubeadm/app/util/system/types_unix.go b/cmd/kubeadm/app/util/system/types_unix.go
index 6c255b2235b..b4902d37601 100644
--- a/cmd/kubeadm/app/util/system/types_unix.go
+++ b/cmd/kubeadm/app/util/system/types_unix.go
@@ -23,9 +23,6 @@ import (
 	"strings"
 )
 
-// dockerEndpoint is the os specific endpoint for docker communication
-const dockerEndpoint = "unix:///var/run/docker.sock"
-
 // DefaultSysSpec is the default SysSpec for Linux
 var DefaultSysSpec = SysSpec{
 	OS: "Linux",
diff --git a/cmd/kubeadm/app/util/system/types_windows.go b/cmd/kubeadm/app/util/system/types_windows.go
index 0d045699cf9..cd79cd192d9 100644
--- a/cmd/kubeadm/app/util/system/types_windows.go
+++ b/cmd/kubeadm/app/util/system/types_windows.go
@@ -23,9 +23,6 @@ import (
 	"strings"
 )
 
-// dockerEndpoint is the os specific endpoint for docker communication
-const dockerEndpoint = "npipe:////./pipe/docker_engine"
-
 // DefaultSysSpec is the default SysSpec for Windows
 var DefaultSysSpec = SysSpec{
 	OS: "Microsoft Windows Server 2016",
diff --git a/hack/.staticcheck_failures b/hack/.staticcheck_failures
index 47f910f45b3..2cdadbab3c8 100644
--- a/hack/.staticcheck_failures
+++ b/hack/.staticcheck_failures
@@ -5,10 +5,6 @@ cmd/controller-manager/app
 cmd/kube-controller-manager/app
 cmd/kube-proxy/app
 cmd/kube-scheduler/app
-cmd/kubeadm/app/cmd/upgrade
-cmd/kubeadm/app/phases/certs/renewal
-cmd/kubeadm/app/preflight
-cmd/kubeadm/app/util/system
 cmd/linkcheck
 cmd/preferredimports
 hack/make-rules/helpers/go2make/testdata/dir-with-gofiles