Apply Scylla sysctls during node tuning

Scylla image contains several custom sysctls which are not applied
automatically. To make sure these are applied on host kernel, additional
container setting it is added to node tuning jobs.

Fixes scylladb#868

pkg/controller/nodeconfigdaemon/resource.go

@@ -60,6 +60,25 @@ func makePerftuneJobForNode(controllerRef *metav1.OwnerReference, namespace, nod
 					HostPID:       true,
 					HostNetwork:   true,
 					Containers: []corev1.Container{
+
+						{
+							Name:            naming.SysctlContainerName,
+							Image:           image,
+							ImagePullPolicy: corev1.PullIfNotPresent,
+							Command: []string{"/bin/sh",
+								"-c",
+								"sysctl -e -f /usr/lib/sysctl.d/*.conf",
+							},
+							SecurityContext: &corev1.SecurityContext{
+								Privileged: pointer.BoolPtr(true),
+							},
+							Resources: corev1.ResourceRequirements{
+								Requests: corev1.ResourceList{
+									corev1.ResourceCPU:    resource.MustParse("10m"),
+									corev1.ResourceMemory: resource.MustParse("50Mi"),
+								},
+							},
+						},
 						{
 							Name:            naming.PerftuneContainerName,
 							Image:           image,

pkg/naming/constants.go

@@ -61,6 +61,7 @@ const (
 	ScyllaContainerName          = "scylla"
 	SidecarInjectorContainerName = "sidecar-injection"
 	PerftuneContainerName        = "perftune"
+	SysctlContainerName          = "sysctl"
 
 	PVCTemplateName = "data"