Ensure node e2e apiserver and test suite can open enough files

The apiserver and test suite in node e2e runs under the sshd daemon
that can limit the amount of files it can open. Set a higher limit
to address the issues.

Signed-off-by: Odin Ugedal <odin@uged.al>

test/e2e_node/e2e_node_suite_test.go

@@ -40,6 +40,7 @@ import (
 	utilyaml "k8s.io/apimachinery/pkg/util/yaml"
 	clientset "k8s.io/client-go/kubernetes"
 	cliflag "k8s.io/component-base/cli/flag"
+	"k8s.io/kubernetes/pkg/util/rlimit"
 	commontest "k8s.io/kubernetes/test/e2e/common"
 	"k8s.io/kubernetes/test/e2e/framework"
 	e2econfig "k8s.io/kubernetes/test/e2e/framework/config"
@@ -123,6 +124,12 @@ func TestMain(m *testing.M) {
 const rootfs = "/rootfs"
 
 func TestE2eNode(t *testing.T) {
+
+	// Make sure we are not limited by sshd when it comes to open files
+	if err := rlimit.SetNumFiles(1000000); err != nil {
+		klog.Infof("failed to set rlimit on max file handles: %v", err)
+	}
+
 	if *runServicesMode {
 		// If run-services-mode is specified, only run services in current process.
 		services.RunE2EServices(t)