diff --git a/metropolis/node/kubernetes/authproxy/authproxy.go b/metropolis/node/kubernetes/authproxy/authproxy.go
index e8e6fd8..c4a844e 100644
--- a/metropolis/node/kubernetes/authproxy/authproxy.go
+++ b/metropolis/node/kubernetes/authproxy/authproxy.go
@@ -56,6 +56,9 @@
 
 	k8sCAs := x509.NewCertPool()
 	cert, _, err := s.KPKI.Certificate(ctx, pki.IdCA)
+	if err != nil {
+		return fmt.Errorf("could not load certificate %q from PKI: %w", pki.IdCA, err)
+	}
 	parsedCert, err := x509.ParseCertificate(cert)
 	if err != nil {
 		return fmt.Errorf("failed to parse K8s CA certificate: %w", err)
diff --git a/metropolis/node/kubernetes/pki/kubernetes.go b/metropolis/node/kubernetes/pki/kubernetes.go
index a30aeda..66731ae 100644
--- a/metropolis/node/kubernetes/pki/kubernetes.go
+++ b/metropolis/node/kubernetes/pki/kubernetes.go
@@ -337,7 +337,7 @@
 	// Save to etcd.
 	_, err = k.KV.Put(ctx, path, string(key))
 	if err != nil {
-		err = fmt.Errorf("failed to write newly generated key: %w", err)
+		return nil, fmt.Errorf("failed to write newly generated key: %w", err)
 	}
 	return key, nil
 }
diff --git a/metropolis/node/kubernetes/plugins/kvmdevice/kvmdevice.go b/metropolis/node/kubernetes/plugins/kvmdevice/kvmdevice.go
index bef049a..007bde6 100644
--- a/metropolis/node/kubernetes/plugins/kvmdevice/kvmdevice.go
+++ b/metropolis/node/kubernetes/plugins/kvmdevice/kvmdevice.go
@@ -158,6 +158,9 @@
 	}
 
 	kvmDevNode, err := deviceNumberFromString(string(kvmDevRaw))
+	if err != nil {
+		return fmt.Errorf("failed to parse KVM device node: %w", err)
+	}
 
 	err = unix.Mknod("/dev/kvm", 0660, int(kvmDevNode))
 	if err != nil && errors.Is(err, unix.EEXIST) {
diff --git a/metropolis/node/kubernetes/service_controller.go b/metropolis/node/kubernetes/service_controller.go
index ccb5b29..c1cec27 100644
--- a/metropolis/node/kubernetes/service_controller.go
+++ b/metropolis/node/kubernetes/service_controller.go
@@ -85,6 +85,9 @@
 	}
 
 	clientConfig, err := rawClientConfig.ClientConfig()
+	if err != nil {
+		return fmt.Errorf("could not fetch generate client config: %w", err)
+	}
 	clientSet, err := kubernetes.NewForConfig(clientConfig)
 	if err != nil {
 		return fmt.Errorf("could not generate kubernetes client: %w", err)
diff --git a/metropolis/node/kubernetes/service_worker.go b/metropolis/node/kubernetes/service_worker.go
index 2572dfa..7ad985f 100644
--- a/metropolis/node/kubernetes/service_worker.go
+++ b/metropolis/node/kubernetes/service_worker.go
@@ -238,6 +238,9 @@
 		return nil, nil, fmt.Errorf("could not generate kubernetes client config: %w", err)
 	}
 	clientConfig, err := rawClientConfig.ClientConfig()
+	if err != nil {
+		return nil, nil, fmt.Errorf("could not fetch generate client config: %w", err)
+	}
 	clientSet, err := kubernetes.NewForConfig(clientConfig)
 	if err != nil {
 		return nil, nil, fmt.Errorf("could not generate kubernetes client: %w", err)