问题

我在使用helm部署一个mysql主从复制的数据库时遇到了一些问题，具体如下：
这是我使用的配置文件

# ruoyi-mysql.yaml
auth:
  rootPassword: "123456"
  database: ry-vue

initdbScriptsConfigMap: ruoyi-init-sql

primary:
  persistence:
    size: 2Gi
    enabled: true

secondary:
  replicaCount: 2
  persistence:
    size: 2Gi
    enabled: true

architecture: replication

运行如下命令

helm install db -f ruoyi-mysql.yaml \
                bitnami/mysql

然而发现我创建的pod都在pending状态
根据网上所说，我使用kubectl describe pod\db-mysql-primary-0
查到了如下信息persistentvolume-controller no persistent volumes available for this claim and no storage class is set
查看本地kubectl get sc，发现本地没有存储类。
于是我稀里糊涂创建了如下存储类

# 创建本地存储类
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: local-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: Immediate

然而并不管用，通过kubectl describe pvc\data-db-mysql-primary-0

Name:          data-my-db-mysql-primary-0
Namespace:     default
StorageClass:  
Status:        Pending
Volume:        
Labels:        app.kubernetes.io/component=primary
               app.kubernetes.io/instance=my-db
               app.kubernetes.io/name=mysql
Annotations:   <none>
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:      
Access Modes:  
VolumeMode:    Filesystem
Used By:       my-db-mysql-primary-0
Events:

尝试

发现并没有指定存储类
于是我更改了这个pvc
方法如下：

然而问题并没有因此解决，原因是我所创建的存储类是local类，需要手动创建pv，闹麻了。
于是果断放弃。

最终解决办法

最终的解决办法是使用官方的local-path类

Local Path Provisioner provides a way for the Kubernetes users to utilize the local storage in each node. Based on the user configuration, the Local Path Provisioner will create either hostPath or local based persistent volume on the node automatically. It utilizes the features introduced by Kubernetes Local Persistent Volume feature, but makes it a simpler solution than the built-in local volume feature in Kubernetes.

大概意思是这个制备器可以自动创建hostpath和local的卷
于是先创建或者直接在官网找相应的yaml文件此处给出

# local-path-provisioner.yaml
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:v0.0.25
          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
      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

然后直接创建即可

kubectl apply -f local-path-provisioner.yaml