Add more debugging tips to the documentation

docs/csi-debug.md

@@ -1,15 +1,35 @@
-## CSI driver debug tips
+## CSI ISCSI driver troubleshooting tips
 
-### Case#1: volume create/delete failed
--
-- locate csi iscsi driver pod
+### volume attach/mount failed
+
+In this case, one can verify the ISCSI CSI driver pod is up and running and also
+all the containers in the same POD are healthy.
+
+```console
+kubectl get pods
 ```
-kubectl get csidriver
-NAME               ATTACHREQUIRED   PODINFOONMOUNT   STORAGECAPACITY   TOKENREQUESTS   REQUIRESREPUBLISH   MODES        AGE
-iscsi.csi.k8s.io   false            false            false             <unset>         false               Persistent   22m
+
+Once verified all containers in the POD are healthy, one can also check
+problematic application pod `describe` output.
+
+```console
+kubectl describe <App POD>
+```
+
+You can also get detailed logging of the mount/attach failure from the ISCSI
+node plugin POD container as shown below.
+
+- locate csi iscsi driver pod
+
+```api
+kubectl get pods
 ```
 
+from above output make use of the pod name and check the logs of iscsi plugin
+container as shown below
+
 - get csi driver logs
+
 ```
 kubectl logs -f csi-iscsi-node-klh5c -c iscsi
 I1217 14:40:55.928307       7 driver.go:48] Driver: iscsi.csi.k8s.io version: 1.0.0
@@ -27,21 +47,35 @@ I1217 14:40:56.767445       7 utils.go:69] GRPC response: {"name":"iscsi.csi.k8s
 ```
 
 #### Update driver version quickly by editing driver deployment directly
-- update  daemonset deployment
+
+iscsi node plugin has been deployed as a `deamonset` object in your cluster, if
+a quick update of the plugin image is required, you can do that by editing
+the `deamonset` deployment object for the new image as shown below.
+
+- update daemonset deployment
+
 ```console
 kubectl get ds
 NAME             DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR            AGE
 csi-iscsi-node   1         1         1       1            1           kubernetes.io/os=linux   51m
 
 kubectl edit daemmonset csi-iscsi-node
 ```
+
 change below config, e.g.
+
 ```console
         image: gcr.io/k8s-staging-sig-storage/iscsiplugin:canary
         imagePullPolicy: IfNotPresent
 
 ```
 
-```console
-$ kubectl logs -f csi-iscsi-node-klh5c -c iscsi
+#### Get more details about the ISCSI CSI driver object
+
+One can list the CSI driver object as shown below.
+
+```
+kubectl get csidriver
+NAME               ATTACHREQUIRED   PODINFOONMOUNT   STORAGECAPACITY   TOKENREQUESTS   REQUIRESREPUBLISH   MODES        AGE
+iscsi.csi.k8s.io   false            false            false             <unset>         false               Persistent   22m
 ```