possible fix for issue with resctrl

Author: ppalucki

.gitignore

@@ -35,3 +35,4 @@ build
 src/simdjson
 /deployment/pcm/smarter-device-manager/
 /deployment/pcm/nri/
+/deployment/pcm/kind-with-registry.sh

deployment/pcm/README.md

@@ -45,15 +45,16 @@ helm install ... --set nfd=true --set podMonitor=true
 
 ** NOTE: DEBUGGING: TODO to be remove before merging **
 
-Build local image for tests/development + fix /pcm/resctrl mounting:
 ```
-# Local image "indirect"
-helm install pcm . --set debugPcm=true -f values-local-image.yaml
-
-BUIDLING IMAGE 
+# Build local image for tests/development + fix /pcm/resctrl mounting (assuming project was configured with cmake previously):
 (cd ../.. ; (cd build ; make -j pcm pcm-sensor-server) ; docker build . -t localhost:5001/pcm-local && docker push localhost:5001/pcm-local; docker run -ti --rm --name pcmtest --entrypoint bash localhost:5001/pcm-local -c "pcm 2>&1 | head -5" )
 
-helm upgrade --install pcm . --set privileged=false --set nfd=true --set podMonitor=true -f values-metal.yaml -f values-indirect.yaml -f values-local-image.yaml --set debugPcm=1
+# Local image "indirect"
+helm upgrade --install pcm . --set debugPcm=true
+
+# exec or check logs
+kubectl exec -ti ds/pcm -- bash
+kubectl logs ds/pcm
 ```
 
 ### Requirements
@@ -124,12 +125,48 @@ mount -t resctrl resctrl /sys/fs/resctrl
 ```
 
 #### 2) Create kind based Kubernetes cluster
+
+
 ```
 kind create cluster
-kind export kubeconfig
 ```
 
+**Note** to be able to collect and test resctrl RDT metrics, kind cluster have to be created with additional mounts:
+
+```
+nodes:
+- role: control-plane
+  extraMounts:
+  - hostPath: /sys/fs/resctrl
+    containerPath: /sys/fs/resctrl
+```
 or (optionally), create kind cluster with local registry with [this script](https://kind.sigs.k8s.io/docs/user/local-registry/).
+and apply the patch using sed:
+
+```
+wget https://kind.sigs.k8s.io/examples/kind-with-registry.sh
+
+sed -i '/apiVersion: kind.x-k8s.io\/v1alpha4/a \
+nodes:\
+- role: control-plane\
+  extraMounts:\
+  - hostPath: /sys/fs/resctrl\
+    containerPath: /sys/fs/resctrl\
+' kind-with-registry.sh
+
+bash kind-with-registry.sh
+```
+
+Check that resctrl is available inside kind node:
+```
+docker exec kind-control-plane ls /sys/fs/resctrl/info
+```
+
+Export kind kubeconfig as default for furhter kubectl commands:
+```
+kind export kubeconfig
+```
+
 
 #### 3) (Optionally) Deploy Node feature discovery
 

deployment/pcm/templates/daemonset.yaml

@@ -139,8 +139,10 @@ spec:
           readOnly: true  # RW?
         {{- end }}
         {{- if .Values.resctrlHostMount }}
-        #- mountPath: /sys/fs/resctrl # HACK because issues with sys mounting!
-        - mountPath: /pcm/resctrl
+        #- mountPath: /sys/fs/resctrl # HACK because issues with sys mounting! ?!?!?! really?
+        # - mountPath: /pcm/resctrl
+        #   name: sysfs-resctrl
+        - mountPath: /sys/fs/resctrl
           name: sysfs-resctrl
         {{- end }}
         {{- if .Values.mcfgMount }}