From b7a1bf3ce9a091cd5fdb98e1b673d99b9218d2cf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?M=C3=A1rcio=20Fernandes?= <marcio.fernandes@outlook.pt>
Date: Sat, 28 Feb 2026 11:40:23 +0000
Subject: [PATCH] modified:   README.md

---
 README.md | 72 ++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 42 insertions(+), 30 deletions(-)

diff --git a/README.md b/README.md
index 4e39f59..e2d378b 100644
--- a/README.md
+++ b/README.md
@@ -11,14 +11,15 @@ Kubernetes is an open‑source platform that automates the deployment, scaling,
   - [OOMKilled](#oomkilled)
   - [Attach to an pod](#attach-to-an-pod)
   - [Run command on pod](#run-command-on-pod)
+- [Persistent volumes](#persistent-volumes)
+  - [find persistent volume used pvc](#find-persistent-volume-used-pvc)
+  - [Patch pv - change to retain policy](#patch-pv---change-to-retain-policy)
+  - [Patch pv - remove finalizers](#patch-pv---remove-finalizers)
 - [kubectl](#kubectl)
   - [Helper pods](#helper-pods)
     - [network testing](#network-testing)
   - [Set Replicas](#set-replicas)
-  - [taint nodes](#taint-nodes)
-    - [control plane - NoSchedule](#control-plane---noschedule)
   - [Resources](#resources)
-  - [Persistent volumes claims](#persistent-volumes-claims)
   - [Services Accounts](#services-accounts)
 - [Secrets](#secrets)
   - [Manifest - Opaque / Base64](#manifest---opaque--base64)
@@ -26,6 +27,8 @@ Kubernetes is an open‑source platform that automates the deployment, scaling,
   - [Inline with heredoc and environment variables](#inline-with-heredoc-and-environment-variables)
   - [substr](#substr)
 - [nodes](#nodes)
+  - [taint nodes](#taint-nodes)
+    - [control plane - NoSchedule](#control-plane---noschedule)
 - [Deployment](#deployment)
   - [Deployment - Set Replicas](#deployment---set-replicas)
   - [Deployment - Restart](#deployment---restart)
@@ -207,6 +210,33 @@ POD_NAME=$(kubectl get pod -l app=myAppName -n appNamespace -o jsonpath='{.items
 kubectl exec -it ${POD_NAME} -- ls /
 ```
 
+## Persistent volumes
+
+### find persistent volume used pvc
+
+``` bash
+NAMESPACE=???
+PVC_NAME=???
+PV_NAME=$(kubectl get pvc $PVC_NAME -n $NAMESPACE -o jsonpath='{.spec.volumeName}')
+echo "${PV_NAME}"
+```
+
+### Patch pv - change to retain policy
+
+``` bash
+PV_NAME="???"
+kubectl patch pv $PV_NAME \
+  -p '{"spec":{"persistentVolumeReclaimPolicy":"Retain"}}'
+```
+
+### Patch pv - remove finalizers
+
+``` bash
+PV_NAME="???"
+kubectl patch pv $PV_NAME \
+  -p '{"metadata":{"finalizers": null}}'
+```
+
 ## kubectl
 
 kubectl is the command‑line tool used to interact with Kubernetes clusters. Think of it as the “remote control” for Kubernetes: it lets you deploy applications, inspect resources, and manage cluster operations directly from your terminal.
@@ -268,23 +298,6 @@ kubectl patch deployment <deployment-name> \
   -p '{"spec":{"replicas":0}}'
 ```
 
-**Set statefulset replicas to 0:**
-
-```bash
-kubectl patch statefulset zigbee2mqtt \
-  -n  mqtt \
-  -p '{"spec":{"replicas":1}}'
-```
-
-### taint nodes
-
-#### control plane - NoSchedule
-
-``` bash
-MASTER_NODE_NAME="master-node-name"
-kubectl taint nodes ${MASTER_NODE_NAME} node-role.kubernetes.io/control-plane=:NoSchedule
-```
-
 ### Resources
 
 **List all resources:**
@@ -299,17 +312,7 @@ kubectl get all -n kube-system | grep traefik
 kubectl get serviceAccount --all-namespaces
 ```
 
-### Persistent volumes claims
 
-**Patch pvc to retain policy:**
-
-``` bash
-PVC_NAME="????"
-NAMESPACE="????"
-PV_NAME= $(kubectl get pvc $PVC_NAME -n $NAMESPACE -o jsonpath='{.spec.volumeName}')
-kubectl patch pv $PV_NAME \
-  -p '{"spec":{"persistentVolumeReclaimPolicy":"Retain"}}'
-```
 
 ### Services Accounts
 
@@ -432,6 +435,15 @@ kubectl describe node <NODE_NAME> | grep taint
 kubectl annotate node <NODE_NAME> <ANNOTATION_NAME>-
 ```
 
+### taint nodes
+
+#### control plane - NoSchedule
+
+``` bash
+MASTER_NODE_NAME="master-node-name"
+kubectl taint nodes ${MASTER_NODE_NAME} node-role.kubernetes.io/control-plane=:NoSchedule
+```
+
 ## Deployment
 
 ### Deployment - Set Replicas