From 23dd4150cb1e05350f9d72f74184aff2dc1f633b Mon Sep 17 00:00:00 2001
From: Hao Zhou <haouc@users.noreply.github.com>
Date: Thu, 21 Dec 2023 16:50:18 -0800
Subject: [PATCH] update debugging doc (#349)

---
 docs/troubleshooting.md | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/docs/troubleshooting.md b/docs/troubleshooting.md
index 036828b7..f8d39732 100644
--- a/docs/troubleshooting.md
+++ b/docs/troubleshooting.md
@@ -161,6 +161,7 @@ containers:
   - name: ENABLE_POD_ENI
     value: "true" 
 ```
+If you are using ConfigMaps that are referred from VPC CNI containers' `env`, you need have the same key/value pair setup in the referred ConfigMap.
 
 **Resolution**
 If the environment variable is not set,
@@ -168,15 +169,29 @@ If the environment variable is not set,
 - Follow the guide to [enable SGP feature](https://docs.aws.amazon.com/eks/latest/userguide/security-groups-for-pods.html).
 
 ### Verify Trunk ENI is created
+Get the EKS managed CRD CNINode
+```
+kubectl get cninode <NODDE_NAME>
+```
+The CNINode's FEATURE column should have
+```
+[{"name":"SecurityGroupsForPods"}]
+```
 
-Describe the Node,
+Alternatively, you can check node for further confirming.
+Describe the Node
 ```
-kubectl describe node node-name
+kubectl describe node <NODE_NAME>
+```
+
+The following annotation will be added in node's `Capacity` and `Allocatable` if Trunk ENI is created successfully
+```
+vpc.amazonaws.com/pod-eni:  9 (could be other values depending on your instance type)
 ```
 
-The following label will be set if Trunk ENI is created,
+Your node should also receive an event like the following:
 ```
-Labels:             vpc.amazonaws.com/has-trunk-attached=true
+Normal  NodeTrunkInitiated       5m12s  vpc-resource-controller  The node has trunk interface initialized successfully
 ```
 
 **Resolution**