Mount /usr/lib and /usr/src inside the Pod

Mount /usr/lib and /usr/src as /host-usr/lib and /host-usr/src inside the pod
to allow NFD to search for the kernel configuration file inside /usr.
This solves the problem of the kernel config file not being present in /boot
on s390x RHCOS.

Signed-off-by: Jan Schintag <jan.schintag@de.ibm.com>

deployment/node-feature-discovery/templates/worker.yaml

@@ -60,6 +60,12 @@ spec:
         - name: host-sys
           mountPath: "/host-sys"
           readOnly: true
+        - name: host-usr-lib
+          mountPath: "/host-usr/lib"
+          readOnly: true
+        - name: host-usr-src
+          mountPath: "/host-usr/src"
+          readOnly: true
         - name: source-d
           mountPath: "/etc/kubernetes/node-feature-discovery/source.d/"
           readOnly: true
@@ -86,6 +92,12 @@ spec:
         - name: host-sys
           hostPath:
             path: "/sys"
+        - name: host-usr-lib
+          hostPath:
+            path: "/usr/lib"
+        - name: host-usr-src
+          hostPath:
+            path: "/usr/src"
         - name: source-d
           hostPath:
             path: "/etc/kubernetes/node-feature-discovery/source.d/"

nfd-daemonset-combined.yaml.template

@@ -104,6 +104,12 @@ spec:
             - name: host-sys
               mountPath: "/host-sys"
               readOnly: true
+            - name: host-usr-lib
+              mountPath: "/host-usr/lib"
+              readOnly: true
+            - name: host-usr-src
+              mountPath: "/host-usr/src"
+              readOnly: true
             - name: source-d
               mountPath: "/etc/kubernetes/node-feature-discovery/source.d/"
               readOnly: true
@@ -128,6 +134,12 @@ spec:
         - name: host-sys
           hostPath:
             path: "/sys"
+        - name: host-usr-lib
+          hostPath:
+            path: "/usr/lib"
+        - name: host-usr-src
+          hostPath:
+            path: "/usr/src"
         - name: source-d
           hostPath:
             path: "/etc/kubernetes/node-feature-discovery/source.d/"

nfd-worker-daemonset.yaml.template

@@ -53,6 +53,12 @@ spec:
             - name: host-sys
               mountPath: "/host-sys"
               readOnly: true
+            - name: host-usr-lib
+              mountPath: "/host-usr/lib"
+              readOnly: true
+            - name: host-usr-src
+              mountPath: "/host-usr/src"
+              readOnly: true
             - name: source-d
               mountPath: "/etc/kubernetes/node-feature-discovery/source.d/"
               readOnly: true
@@ -81,6 +87,12 @@ spec:
         - name: host-sys
           hostPath:
             path: "/sys"
+        - name: host-usr-lib
+          hostPath:
+            path: "/usr/lib"
+        - name: host-usr-src
+          hostPath:
+            path: "/usr/src"
         - name: source-d
           hostPath:
             path: "/etc/kubernetes/node-feature-discovery/source.d/"

nfd-worker-job.yaml.template

@@ -63,6 +63,12 @@ spec:
             - name: host-sys
               mountPath: "/host-sys"
               readOnly: true
+            - name: host-usr-lib
+              mountPath: "/host-usr/lib"
+              readOnly: true
+            - name: host-usr-src
+              mountPath: "/host-usr/src"
+              readOnly: true
             - name: source-d
               mountPath: "/etc/kubernetes/node-feature-discovery/source.d/"
               readOnly: true
@@ -95,6 +101,12 @@ spec:
         - name: host-sys
           hostPath:
             path: "/sys"
+        - name: host-usr-lib
+          hostPath:
+            path: "/usr/lib"
+        - name: host-usr-src
+          hostPath:
+            path: "/usr/src"
         - name: source-d
           hostPath:
             path: "/etc/kubernetes/node-feature-discovery/source.d/"

source/config.go

@@ -28,6 +28,8 @@ var (
 	EtcDir = HostDir(pathPrefix + "etc")
 	// SysfsPath is where the /sys directory of the system to be inspected is located
 	SysfsDir = HostDir(pathPrefix + "sys")
+	// UsrPath is where the /usr directory of the system to be inspected is located
+	UsrDir = HostDir(pathPrefix + "usr")
 )
 
 // HostDir is a helper for handling host system directories

source/internal/kernelutils/kernel_kconfig.go

@@ -62,19 +62,19 @@ func ParseKconfig(configPath string) (map[string]string, error) {
 	if err != nil {
 		searchPaths = []string{
 			"/proc/config.gz",
-			"/usr/src/linux/.config",
+			source.UsrDir.Path("src/linux/.config"),
 		}
 	} else {
 		// from k8s.io/system-validator used by kubeadm
 		// preflight checks
 		searchPaths = []string{
 			"/proc/config.gz",
-			"/usr/src/linux-" + kVer + "/.config",
+			source.UsrDir.Path("src/linux-" + kVer + "/.config"),
-			"/usr/src/linux/.config",
+			source.UsrDir.Path("src/linux/.config"),
-			"/usr/lib/modules/" + kVer + "/config",
+			source.UsrDir.Path("lib/modules/" + kVer + "/config"),
-			"/usr/lib/ostree-boot/config-" + kVer,
+			source.UsrDir.Path("lib/ostree-boot/config-" + kVer),
-			"/usr/lib/kernel/config-" + kVer,
+			source.UsrDir.Path("lib/kernel/config-" + kVer),
-			"/usr/src/linux-headers-" + kVer + "/.config",
+			source.UsrDir.Path("src/linux-headers-" + kVer + "/.config"),
 			"/lib/modules/" + kVer + "/build/.config",
 			source.BootDir.Path("config-" + kVer),
 		}

test/e2e/node_feature_discovery.go

@@ -338,6 +338,16 @@ func nfdWorkerPodSpec(image string, extraArgs []string) v1.PodSpec {
 						MountPath: "/host-sys",
 						ReadOnly:  true,
 					},
+					{
+						Name:      "host-usr-lib",
+						MountPath: "/host-usr/lib",
+						ReadOnly:  true,
+					},
+					{
+						Name:      "host-usr-src",
+						MountPath: "/host-usr/src",
+						ReadOnly:  true,
+					},
 				},
 			},
 		},
@@ -371,6 +381,24 @@ func nfdWorkerPodSpec(image string, extraArgs []string) v1.PodSpec {
 					},
 				},
 			},
+			{
+				Name: "host-usr-lib",
+				VolumeSource: v1.VolumeSource{
+					HostPath: &v1.HostPathVolumeSource{
+						Path: "/usr/lib",
+						Type: newHostPathType(v1.HostPathDirectory),
+					},
+				},
+			},
+			{
+				Name: "host-usr-src",
+				VolumeSource: v1.VolumeSource{
+					HostPath: &v1.HostPathVolumeSource{
+						Path: "/usr/src",
+						Type: newHostPathType(v1.HostPathDirectory),
+					},
+				},
+			},
 		},
 	}