Fix typo, defer TARGET_NODE resolution, and add code block language specifiers

- Fix typo: rescheuling -> rescheduling in demos/README.md
- Move TARGET_NODE lookup into find_target_node() called after check_cluster()
- Prevents kubectl errors when cluster isn't validated yet
- Add language specifiers to code blocks (text, bash) for proper syntax highlighting

Signed-off-by: Karla Saur <[email protected]>

Author: ksaur

demos/README.md

@@ -17,7 +17,7 @@ Interactive demonstrations of NVSentinel's core capabilities that run locally on
 
 ## Coming Soon
 
-- Pod rescheuling and restarting from checkpointing
+- Pod rescheduling and restarting from checkpointing
 
 **Questions?** See the [main README](../README.md) or [open an issue](https://github.com/NVIDIA/NVSentinel/issues).
 

demos/local-xid-demo/README.md

@@ -39,7 +39,7 @@ Welcome! This demo shows NVSentinel's core functionality running locally on your
 **What you'll see:** The entire workflow runs automatically from cluster creation through error injection to verification. Great for getting a quick sense of NVSentinel's capabilities, but you won't see the details of each step.
 
 ```bash
-# Run the complete demo (takes ~6-10 minutes)
+# Run the complete demo (takes ~5-10 minutes)
 make demo
 
 # Clean up when done
@@ -111,7 +111,7 @@ This demo uses a **minimal NVSentinel deployment** with:
 - **Fault Quarantine** - Rule engine that cordons nodes on fatal errors
 - **MongoDB** - Event storage and change streams
 
-```
+```text
 ┌───────────────────────────────────────────────────────┐
 │  Your Laptop (KIND Cluster)                           │
 │                                                       │
@@ -170,7 +170,7 @@ Shows the healthy cluster:
 
 **Expected output:**
 
-```
+```bash
 $ kubectl get nodes
 NAME                            STATUS   ROLES           AGE   VERSION
 nvsentinel-demo-control-plane   Ready    control-plane   2m    v1.31.0
@@ -222,7 +222,7 @@ Confirms the automated response:
 
 **Expected output:**
 
-```
+```bash
 $ kubectl get nodes
 NAME                            STATUS                     ROLES           AGE   VERSION
 nvsentinel-demo-control-plane   Ready                      control-plane   12m   v1.31.0

demos/local-xid-demo/scripts/02-inject-xid.sh

@@ -24,13 +24,7 @@ NC='\033[0m'
 
 CLUSTER_NAME="nvsentinel-demo"
 NAMESPACE="nvsentinel"
-# Dynamically find the first worker node (supports clusters with 1 or more workers)
-TARGET_NODE=$(kubectl get nodes -o json | jq -r '.items[] | select(.metadata.name | contains("worker")) | .metadata.name' | head -1)
-
-if [ -z "$TARGET_NODE" ]; then
-    echo -e "\n${RED}[ERROR]${NC} No worker nodes found in cluster"
-    exit 1
-fi
+TARGET_NODE=""
 
 log() {
     echo -e "${BLUE}[INFO]${NC} $1"
@@ -65,6 +59,16 @@ check_cluster() {
     kubectl config use-context "kind-${CLUSTER_NAME}" > /dev/null 2>&1
 }
 
+find_target_node() {
+    # Dynamically find the first worker node (supports clusters with 1 or more workers)
+    TARGET_NODE=$(kubectl get nodes -o json | jq -r '.items[] | select(.metadata.name | contains("worker")) | .metadata.name' | head -1)
+    
+    if [ -z "$TARGET_NODE" ]; then
+        echo -e "\n${RED}[ERROR]${NC} No worker nodes found in cluster"
+        exit 1
+    fi
+}
+
 check_node_exists() {
     if ! kubectl get node "$TARGET_NODE" &> /dev/null; then
         error "Node '$TARGET_NODE' not found in cluster"

demos/local-xid-demo/scripts/03-verify-cordon.sh

@@ -24,13 +24,7 @@ NC='\033[0m'
 
 CLUSTER_NAME="nvsentinel-demo"
 NAMESPACE="nvsentinel"
-# Dynamically find the first worker node (supports clusters with 1 or more workers)
-TARGET_NODE=$(kubectl get nodes -o json | jq -r '.items[] | select(.metadata.name | contains("worker")) | .metadata.name' | head -1)
-
-if [ -z "$TARGET_NODE" ]; then
-    echo -e "\n${RED}[ERROR]${NC} No worker nodes found in cluster"
-    exit 1
-fi
+TARGET_NODE=""
 
 log() {
     echo -e "${BLUE}[INFO]${NC} $1"
@@ -65,6 +59,16 @@ check_cluster() {
     kubectl config use-context "kind-${CLUSTER_NAME}" > /dev/null 2>&1
 }
 
+find_target_node() {
+    # Dynamically find the first worker node (supports clusters with 1 or more workers)
+    TARGET_NODE=$(kubectl get nodes -o json | jq -r '.items[] | select(.metadata.name | contains("worker")) | .metadata.name' | head -1)
+    
+    if [ -z "$TARGET_NODE" ]; then
+        echo -e "\n${RED}[ERROR]${NC} No worker nodes found in cluster"
+        exit 1
+    fi
+}
+
 verify_cordon() {
     section "Verifying Node Cordon Status"
 
@@ -193,6 +197,7 @@ verify_cordon() {
 
 main() {
     check_cluster
+    find_target_node
     verify_cordon
 }