modified: README.md

new file:   manifests/alpine-deployment.yaml
new file:   manifests/debian-deployment.yaml

README.md

@@ -57,6 +57,7 @@ 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)
+  - [Containerd state](#containerd-state)
 - [host cli](#host-cli)
   - [host cli - check port usage](#host-cli---check-port-usage)
   - [kill all connections](#kill-all-connections)
@@ -786,6 +787,38 @@ rm -rf /var/lib/rancher/k3s/agent/etc/klipper-lb
 systemctl restart k3s-agent
 ```
 
+### Containerd state
+
+This procedure simulates a fresh node joining the cluster.
+It deletes all containerd runtime state but does not remove the node from the cluster.
+
+1. Stop k3s (server or agent)
+1. Delete containerd state
+
+    ```bash
+    sudo rm -rf /var/lib/rancher/k3s/agent/containerd
+    sudo rm -rf /var/lib/containerd
+    ```
+
+1. Start k3s
+
+ **What this does:**
+
+- Removes all images, snapshots, and container metadata
+- Forces k3s to repull every image through CRI → mirrors → Harbor
+- Simulates a fresh node rebuild
+- Node identity, certificates, and cluster membership remain intact
+- Workloads are rescheduled normally
+- This is the correct method to validate offline rebuild capability and ensure Harbor mirrors are complete.
+
+If all container images are provided locally (Example: through Harbor proxy caches), then the entire containerd image store becomes fully ephemeral.
+This means:
+
+- /var/lib/rancher/k3s/agent/containerd
+- /var/lib/containerd
+
+contain no unique or irreplaceable data. so it can be ignored on backups.
+
 ## host cli
 
 ### host cli - check port usage

manifests/alpine-deployment.yaml

@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: alpine
+spec:
+  containers:
+  - name: alpine
+    image: docker.io/library/alpine:latest
+    command: ["sh", "-c", "echo OK && sleep 3600"]
+  restartPolicy: Never

manifests/debian-deployment.yaml

@@ -0,0 +1,20 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: debian
+  labels:
+    app: debian
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: debian
+  template:
+    metadata:
+      labels:
+        app: debian
+    spec:
+      containers:
+        - name: debian
+          image: debian:latest
+          command: ["sleep", "infinity"]