diff --git a/README.md b/README.md
index 13732dd..890b4c5 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,8 @@ Kubernetes is an open‑source platform that automates the deployment, scaling,
     - [Failed unmounting var-lib-rancher.mount on reboot](#failed-unmounting-var-lib-ranchermount-on-reboot)
   - [klipper-lb](#klipper-lb)
     - [troubleshooting](#troubleshooting)
+- [host cli](#host-cli)
+  - [host cli - check port usage](#host-cli---check-port-usage)
 
 ## Namespaces
 
@@ -676,3 +678,12 @@ Klipper‑LB is the tiny, built‑in load balancer that k3s uses to give each ag
 rm -rf /var/lib/rancher/k3s/agent/etc/klipper-lb 
 systemctl restart k3s-agent
 ```
+
+## host cli
+
+### host cli - check port usage
+
+``` bash
+# example: port 32329
+ss -ltnp | grep 32329
+```