# StatefulSet 會自動創(chuàng)建：
# PVC: disk-ssd-web-0 → PV: pv-001 (綁定)
# PVC: disk-ssd-web-1 → PV: pv-002 (綁定)
# 即使 web-0 被刪除重建，disk-ssd-web-0 仍會重新掛載到原 PV

kubectl create ns nginx

kubectl get storageclass -A

apiVersion: v1
kind: Namespace
metadata:
  name: local-path-storage

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: local-path-provisioner-service-account
  namespace: local-path-storage

---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: local-path-provisioner-role
  namespace: local-path-storage
rules:
  - apiGroups: [""]
    resources: ["pods"]
    verbs: ["get", "list", "watch", "create", "patch", "update", "delete"]

---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: local-path-provisioner-role
rules:
  - apiGroups: [""]
    resources: ["nodes", "persistentvolumeclaims", "configmaps", "pods", "pods/log"]
    verbs: ["get", "list", "watch"]
  - apiGroups: [""]
    resources: ["persistentvolumes"]
    verbs: ["get", "list", "watch", "create", "patch", "update", "delete"]
  - apiGroups: [""]
    resources: ["events"]
    verbs: ["create", "patch"]
  - apiGroups: ["storage.k8s.io"]
    resources: ["storageclasses"]
    verbs: ["get", "list", "watch"]

---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: local-path-provisioner-bind
  namespace: local-path-storage
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: local-path-provisioner-role
subjects:
  - kind: ServiceAccount
    name: local-path-provisioner-service-account
    namespace: local-path-storage

---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: local-path-provisioner-bind
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: local-path-provisioner-role
subjects:
  - kind: ServiceAccount
    name: local-path-provisioner-service-account
    namespace: local-path-storage

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: local-path-provisioner
  namespace: local-path-storage
spec:
  replicas: 1
  selector:
    matchLabels:
      app: local-path-provisioner
  template:
    metadata:
      labels:
        app: local-path-provisioner
    spec:
      serviceAccountName: local-path-provisioner-service-account
      containers:
        - name: local-path-provisioner
          image: rancher/local-path-provisioner:v0.0.35
          imagePullPolicy: IfNotPresent
          command:
            - local-path-provisioner
            - --debug
            - start
            - --config
            - /etc/config/config.json
          volumeMounts:
            - name: config-volume
              mountPath: /etc/config/
          env:
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            - name: CONFIG_MOUNT_PATH
              value: /etc/config/
      volumes:
        - name: config-volume
          configMap:
            name: local-path-config

---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: local-path
provisioner: rancher.io/local-path
volumeBindingMode: WaitForFirstConsumer
reclaimPolicy: Delete

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: local-path-config
  namespace: local-path-storage
data:
  config.json: |-
    {
            "nodePathMap":[
            {
                    "node":"DEFAULT_PATH_FOR_NON_LISTED_NODES",
                    "paths":["/opt/local-path-provisioner"]
            }
            ]
    }
  setup: |-
    #!/bin/sh
    set -eu
    mkdir -m 0777 -p "$VOL_DIR"
  teardown: |-
    #!/bin/sh
    set -eu
    rm -rf "$VOL_DIR"
  helperPod.yaml: |-
    apiVersion: v1
    kind: Pod
    metadata:
      name: helper-pod
    spec:
      priorityClassName: system-node-critical
      tolerations:
        - key: node.kubernetes.io/disk-pressure
          operator: Exists
          effect: NoSchedule
      containers:
      - name: helper-pod
        image: busybox
        imagePullPolicy: IfNotPresent

kubectl apply -f local-path-storage.yaml

kubectl get storageclass

apiVersion: v1
kind: Service
metadata:
  name: nginx
  namespace: nginx
  labels:
    app: nginx
spec:
  type: ClusterIP
  selector:
    app: nginx
  clusterIP: None
  sessionAffinity: None
  ports:
    - name: web
      port: 80
      protocol: TCP

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: nginx
  namespace: nginx
spec:
  serviceName: nginx
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      initContainers:
      - name: init-html
        image: busybox
        command: 
          - sh
          - -c
          - |
            # 檢查是否已初始化
            if [ ! -f /mnt/html/.initialized ]; then
              echo "First boot - creating initial content"
              echo "Welcome to nginx - $(hostname) - $(date)" > /mnt/html/index.html
              echo "This is a test page" >> /mnt/html/index.html
              touch /mnt/html/.initialized  # 創(chuàng)建標(biāo)記文件
            else
              echo "Already initialized, keeping existing content"
            fi
        volumeMounts:
        - name: www
          mountPath: /mnt/html
      containers:
      - name: nginx
        image: nginx:1.24
        imagePullPolicy: IfNotPresent
        ports:
        - name: web
          containerPort: 80
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html
        livenessProbe:
          initialDelaySeconds: 10
          periodSeconds: 10
          tcpSocket:
            port: 80
        readinessProbe:
          initialDelaySeconds: 10
          periodSeconds: 10
          httpGet:
            path: /
            port: 80
  volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes: ["ReadWriteOnce"]
      storageClassName: "local-path"  # 根據(jù)storageclass集群修改
      resources:
        requests:
          storage: 1Gi

kubectl apply -f nginx-Headless.yaml

kubectl get svc -n nginx

kubectl apply -f nginx-StatefulSet.yaml

# 查看nginx pvc
kubectl get pvc -n nginx -w
# 查看nginx pod
kubectl get pod -n nginx -w
# 查看nginx StatefulSet
kubectl get sts -n nginx -o wide

[root@k8s-master StatefulSet]# kubectl  get pods -n nginx -o wide
NAME      READY   STATUS    RESTARTS   AGE     IP                NODE        NOMINATED NODE   READINESS GATES
nginx-0   1/1     Running   0          3m37s   192.168.36.94     k8s-node1   <none>           <none>
nginx-1   1/1     Running   0          3m19s   192.168.36.99     k8s-node1   <none>           <none>
nginx-2   1/1     Running   0          3m      192.168.169.143   k8s-node2   <none>           <none>

[root@k8s-master StatefulSet]# kubectl exec -n nginx nginx-0 -- hostname
nginx-0
# 通過DNS解析訪問（這里需要注意，指定nginx部署的ns，要不然會報無法解析）
[root@k8s-master StatefulSet]# kubectl run -it --rm busybox --image=busybox:1.28 --restart=Never -n nginx -- nslookup nginx-0.nginx 2>/dev/null || echo "測試失敗"
Server:    10.0.0.2
Address 1: 10.0.0.2 kube-dns.kube-system.svc.cluster.local
Name:      nginx-0.nginx
Address 1: 192.168.36.94 nginx-0.nginx.nginx.svc.cluster.local

# 查看自動創(chuàng)建的PVC
[root@k8s-master StatefulSet]# kubectl get pvc -n nginx
NAME          STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
www-nginx-0   Bound    pvc-67c250d5-3e78-4c69-a4ad-2bfacf84c54b   1Gi        RWO            local-path     5d
www-nginx-1   Bound    pvc-13f90069-60b5-4c93-86c3-76e1377b5098   1Gi        RWO            local-path     5d
www-nginx-2   Bound    pvc-2ba2e9e5-5794-4b6e-af5b-b940ccb414e1   1Gi        RWO            local-path     5d

# 查看nginx-0 默認(rèn)的index.html數(shù)據(jù)
kubectl exec -n nginx nginx-0 -- bash -c "cat /usr/share/nginx/html/index.html"
# 在nginx-0中寫入數(shù)據(jù)
kubectl exec -n nginx nginx-0 -- bash -c 'echo "Hello Nginx, Im's nginx-0 pod !!! " > /usr/share/nginx/html/index.html'
# 查看nginx-0 修改后的index.html數(shù)據(jù)
kubectl exec -n nginx nginx-0 -- bash -c "cat /usr/share/nginx/html/index.html"
# 刪除nginx-0
kubectl delete pods -n nginx nginx-0
# StatefulSet會自動重建，查看nginx-o pod是否重建
kubectl get pods -n nginx -w
# 重建成功再次查看nginx-0 pod容器里index.html里的內(nèi)容
kubectl exec -n nginx nginx-0 -- bash -c "cat /usr/share/nginx/html/index.html"

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: nginx
spec:
  updateStrategy:
    type: RollingUpdate  # 默認(rèn)值，可不寫
  # ... 其他配置

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: nginx
spec:
  updateStrategy:
    type: RollingUpdate
    rollingUpdate:
      partition: 2  # 只更新序號 >= 2 的 Pod
  # ... 其他配置

# 第一步：只更新最后一個 Pod 做測試
updateStrategy:
  type: RollingUpdate
  rollingUpdate:
    partition: 2  # 只更新 nginx-2

# 第二步：更新所有 Pod
updateStrategy:
  type: RollingUpdate
  rollingUpdate:
    partition: 0  # 更新全部

# 主節(jié)點是 nginx-0，保持不更新
updateStrategy:
  type: RollingUpdate
  rollingUpdate:
    partition: 1  # 只更新 nginx-1, nginx-2

# 第1批：更新 30%（最后一個）更新完需測試
partition: 2

# 第2批：更新 60%（后兩個）更新完需測試
partition: 1

# 第3批：更新 100%       更新完需測試
partition: 0

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: nginx
spec:
  updateStrategy:
    type: OnDelete  # 手動模式
  # ... 其他配置

# 1. 修改 StatefulSet 鏡像版本（但不會立即生效）
kubectl patch sts -n nginx nginx -p '{"spec":{"template":{"spec":{"containers":[{"name":"nginx","image":"nginx:1.25"}]}}}}'

# 2. 手動刪除要更新的 Pod
kubectl delete pod -n nginx nginx-2  # 先更新最后一個
## 更新完成查看版本號，確認(rèn)是否更新成功
kubectl exec -n nginx nginx-2 -- nginx -v

# 3. 驗證 nginx-2 沒問題后
kubectl delete pod -n nginx nginx-1  # 更新中間
## 更新完成查看版本號，確認(rèn)是否更新成功
kubectl exec -n nginx nginx-2 -- nginx -v

# 4. 最后更新主節(jié)點
kubectl delete pod -n nginx nginx-0
## 更新完成查看版本號，確認(rèn)是否更新成功
kubectl exec -n nginx nginx-2 -- nginx -v