Replaced SELinux disabling example with setting permissive mode

Author: palonsoro

modules/nodes-nodes-kernel-arguments.adoc

@@ -18,9 +18,11 @@ Improper use of kernel arguments can result in your systems becoming unbootable.
 
 Examples of kernel arguments you could set include:
 
-* **selinux=0**: Disables Security Enhanced Linux (SELinux).
-While not recommended for production, disabling SELinux can
-improve performance by 2% - 3%.
+* **enforcing=0**: Configures Security Enhanced Linux (SELinux) to run in permissive mode.
+In permissive mode, the system acts as if SELinux is enforcing the loaded security policy, 
+including labeling objects and emitting access denial entries in the logs, 
+but it does not actually deny any operations. While not recommended for production systems, 
+permissive mode can be helpful for debugging.  
 
 * **nosmt**: Disables symmetric multithreading (SMT) in the kernel.
 Multithreading allows multiple logical threads for each CPU.
@@ -68,7 +70,7 @@ rendered-master-23e785de7587df95a4b517e0647e5ab7   52dd3ba6a9a527fc3ab42afac8d12
 rendered-worker-5d596d9293ca3ea80c896a1191735bb1   52dd3ba6a9a527fc3ab42afac8d12b693534c8c9   3.2.0             33m
 ----
 
-. Create a `MachineConfig` object file that identifies the kernel argument (for example, `05-worker-kernelarg-selinuxoff.yaml`)
+. Create a `MachineConfig` object file that identifies the kernel argument (for example, `05-worker-kernelarg-selinuxpermissive.yaml`)
 +
 [source,yaml]
 ----
@@ -77,25 +79,25 @@ kind: MachineConfig
 metadata:
   labels:
     machineconfiguration.openshift.io/role: worker<1>
-  name: 05-worker-kernelarg-selinuxoff<2>
+  name: 05-worker-kernelarg-selinuxpermissive<2>
 spec:
   config:
     ignition:
       version: 3.1.0
   kernelArguments:
-    - selinux=0<3>
+    - enforcing=0<3>
 ----
 +
 <1> Applies the new kernel argument only to worker nodes.
 <2> Named to identify where it fits among the machine configs (05) and what it does (adds
-a kernel argument to turn off SELinux).
-<3> Identifies the exact kernel argument as `selinux=0`.
+a kernel argument to configure SELinux permissive mode).
+<3> Identifies the exact kernel argument as `enforcing=0`.
 
 . Create the new machine config:
 +
 [source,terminal]
 ----
-$ oc create -f 05-worker-kernelarg-selinuxoff.yaml
+$ oc create -f 05-worker-kernelarg-selinuxpermissive.yaml
 ----
 
 . Check the machine configs to see that the new one was added:
@@ -116,7 +118,7 @@ NAME                                               GENERATEDBYCONTROLLER
 01-worker-container-runtime                        52dd3ba6a9a527fc3ab42afac8d12b693534c8c9   3.2.0             33m
 01-worker-kubelet                                  52dd3ba6a9a527fc3ab42afac8d12b693534c8c9   3.2.0             33m
 
-05-worker-kernelarg-selinuxoff                                                                3.1.0             105s
+05-worker-kernelarg-selinuxpermissive                                                         3.1.0             105s
 
 99-master-generated-registries                     52dd3ba6a9a527fc3ab42afac8d12b693534c8c9   3.2.0             33m
 99-master-ssh                                                                                 3.1.0             40m
@@ -164,9 +166,9 @@ To use host binaries, run `chroot /host`
 sh-4.2# cat /host/proc/cmdline
 BOOT_IMAGE=/ostree/rhcos-... console=tty0 console=ttyS0,115200n8
 rootflags=defaults,prjquota rw root=UUID=fd0... ostree=/ostree/boot.0/rhcos/16...
-coreos.oem.id=qemu coreos.oem.id=ec2 ignition.platform.id=ec2 selinux=0
+coreos.oem.id=qemu coreos.oem.id=ec2 ignition.platform.id=ec2 enforcing=0
 
 sh-4.2# exit
 ----
 +
-You should see the `selinux=0` argument added to the other kernel arguments.
+You should see the `enforcing=0` argument added to the other kernel arguments.