update kuber doc: stroage

Containerization & Orchestration/Kubernetes/workloads/11-Pv.md

@@ -1,205 +0,0 @@
-# 🌐 Kubernetes Persistent Volumes (PV) Cheat Sheet
-
-## 📦 What is a Persistent Volume (PV)?
-
-A **Persistent Volume (PV)** is a piece of storage in a Kubernetes cluster that is either:
-
-* Pre-provisioned by an administrator, or
-* Dynamically provisioned using **StorageClasses**.
-
-It allows data to **persist beyond the lifecycle of individual Pods**.
-
----
-
-## 📁 PV Storage Options
-
-1. **HostPath**
-
-   * Mounts a file or directory from the host node’s filesystem into your Pod.
-   * Useful only for single-node testing or development.
-
-2. **Using PV and PVC**
-
-   * **PV (Persistent Volume):** Represents the actual storage resource.
-   * **PVC (Persistent Volume Claim):** A user's request for storage resources and access.
-
----
-
-## 🧱 Kubernetes Storage Layers
-
-1. **Persistent Volume (PV)** – The actual storage unit.
-2. **Persistent Volume Claim (PVC)** – A request for that storage.
-
----
-
-## 🔄 PV Lifecycle States
-
-| State        | Description                                |
-| ------------ | ------------------------------------------ |
-| Provisioning | PV is being prepared.                      |
-| Binding      | PV is bound to a PVC.                      |
-| Using        | PV is in use by a Pod.                     |
-| Releasing    | PVC is deleted; PV becomes unbound.        |
-| Reclaiming   | Reclaim policy is applied:                 |
-|              | • `Delete` – Remove the storage.           |
-|              | • `Recycle` – Basic scrub (deprecated).    |
-|              | • `Retain` – Manual intervention required. |
-
----
-
-## 🔒 PV Access Modes
-
-| Mode   | Description                                    |
-| ------ | ---------------------------------------------- |
-| `RWO`  | **ReadWriteOnce** – One node can read/write    |
-| `ROX`  | **ReadOnlyMany** – Multiple nodes read-only    |
-| `RWX`  | **ReadWriteMany** – Multiple nodes read/write  |
-| `RWOP` | **ReadWriteOncePod** – Only one Pod can use it |
-
----
-
-## 🛠️ CLI Commands to Manage PVs
-
-```bash
-# List all Persistent Volumes
-kubectl get pv
-
-# List all Persistent Volume Claims
-kubectl get pvc
-
-# Edit a PVC
-kubectl edit pvc -n <namespace> <pvc-name>
-```
-
----
-
-## 🚀 Example 1: Deployment with `hostPath` Volume
-
-```yaml
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: app-1
-  namespace: dev
-  labels:
-    app.kubernetes.io/name: nginx
-spec:
-  replicas: 3
-  selector:
-    matchLabels:
-      app.kubernetes.io/name: nginx
-  template:
-    metadata:
-      labels:
-        app.kubernetes.io/name: nginx
-    spec:
-      containers:
-        - name: nginx
-          image: nginx
-          ports:
-            - containerPort: 80
-          volumeMounts:
-            - name: nginx-log
-              mountPath: /var/log/nginx
-      volumes:
-        - name: nginx-log
-          hostPath:
-            path: /root/nginx/logs
-            type: DirectoryOrCreate
-```
-
-```yaml
-spec:
-  containers:
-    volumeMounts:
-      - name: nginx-log
-        mountPath: /var/log/nginx
-
-volumes:
-  - name: nginx-log
-    emptyDir:
-      sizeLimit: 500Mi
-```
-
----
-
-## 📂 Example 2: NFS-backed Persistent Volume
-
-### 🧩 PersistentVolume Definition
-
-```yaml
-apiVersion: v1
-kind: PersistentVolume
-metadata:
-  name: pv1
-spec:
-  capacity:
-    storage: 5Gi
-  volumeMode: Filesystem
-  accessModes:
-    - ReadWriteMany
-  persistentVolumeReclaimPolicy: Retain
-  storageClassName: custom-name
-  mountOptions:
-    - hard
-    - nfsvers=4.1
-  nfs:
-    path: /nfs/data
-    server: 192.168.1.10
-```
-
-### 📄 PersistentVolumeClaim
-
-```yaml
-apiVersion: v1
-kind: PersistentVolumeClaim
-metadata:
-  name: pvc1
-  namespace: ns-test
-spec:
-  accessModes:
-    - ReadWriteMany
-  resources:
-    requests:
-      storage: 1Gi
-  storageClassName: custom-name
-```
-
-### 🚀 Deployment Using PVC
-
-```yaml
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: app-1
-  namespace: dev
-  labels:
-    app.kubernetes.io/name: nginx
-spec:
-  replicas: 3
-  selector:
-    matchLabels:
-      app.kubernetes.io/name: nginx
-  template:
-    metadata:
-      labels:
-        app.kubernetes.io/name: nginx
-    spec:
-      containers:
-        - name: nginx
-          image: nginx
-          ports:
-            - containerPort: 80
-          volumeMounts:
-            - name: nginx-log
-              mountPath: /var/log/nginx
-      volumes:
-        - name: nginx-log
-          persistentVolumeClaim:
-            claimName: pvc1
-```
-
----
-
-## 📝 Common Mistakes Fixed
-