单节点

nfs挂载方式

? ? ? ? 镜像使用mysql:5.7, imagePullPolicy设置为IfNotPresent, 表示有镜像的话不会从remote registry重新拉取。

????????部署mysql时，我们需要使用数据挂载，否则会出现数据丢失的情况，这里采用nfs挂载的方式, 我们需要给挂载的目标文件路径/data/dev/mysql授权777, 同时设置为nfs对该路径mount时为insecure,编写mysql-dev-nfs.yaml文件:?

---
apiVersion: v1
kind: Service
metadata:
  name: mysql-dev
spec:
  ports:
    - port: 3306
      nodePort: 30060
  selector:
    app: mysql-dev
  type: NodePort
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql-dev
  labels:
    app: mysql-dev
spec:
  replicas: 1 # pod数量
  selector:
    matchLabels:
      app: mysql-dev
  template:
    metadata:
      labels:
        app: mysql-dev
    spec:
      containers:
        - name: mysql-dev
          image: mysql:5.7
          imagePullPolicy: IfNotPresent
          resources:
            limits:
              memory: "512Mi"
              cpu: "1500m"
          ports:
            - containerPort: 3306
          env:
            - name: MYSQL_ROOT_PASSWORD
              value: "123456"
          volumeMounts:
            - name: mysql-data
              mountPath: /var/lib/mysql
            - name: mysql-dev-conf
              mountPath: /etc/mysql
      volumes:
        - name: mysql-data
          nfs:
            server: localhost
            path: /data/dev/mysql
        - name: mysql-dev-conf
          configMap:
            name: my.cnf
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: my.cnf
data:
  my.cnf: |
    [mysqld]
    port = 3306
    character-set-server=utf8mb4
    collation-server=utf8mb4_unicode_ci
    skip-character-set-client-handshake=1
    default-storage-engine=INNODB
    max_allowed_packet = 500M
    explicit_defaults_for_timestamp=1
    long_query_time = 10

暴露端口为30060，执行mysql-dev-nfs.yaml，命令：

kubectl apply -f mysql-dev-nfs.yaml

对外的端口使用30060, 测试是否能连接成:

?注意: 如果使用nfs挂载方式，那么需要将挂载nfs的pod停止后，centos才能关机, 否则在关机时会出现如下报错: A stop job is running for ...

? ? ? ? 此问题是因为nfs的资源在被占用，与关机需要的请求资源相竞争，形式一种死锁的形态，暂时没有好的解决方式，只能先通过停止Pod的方式先解决。?

[nfs无法挂载问题] mount.nfs: access denied by server while mounting localhost:/data/dev/mysql_ Dream_it_possible！的博客-CSDN博客

pvc挂载方式

? ? ? ? 采用pvc挂载方式，那么需要先声明pv卷，然后绑定pvc卷，Pvc启动成功后，mysql才能使用。

? ? ? ? 建议将pvc与mysql的pod分开编写，便于管理，如果把pv和pvc的脚本和mysql放一起，在停mysql pod时，会出现卡顿的情况。

编写PersistentVolume和PersistentVolumeClaim

? ? ? ? 编写persistVolume.yaml文件，声明pv和pvc

---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-01-pvc
spec:
  accessModes:
    - ReadWriteOnce   # 只能被一个容器访问，如果能被多个容器访问那么设置为ReadWriteMany
  resources:
    requests:
      storage: 3Gi
  storageClassName: standard
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: 3g-pv-1
spec:
  capacity:
    storage: 3Gi
  volumeMode: Filesystem
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Delete
  storageClassName: standard
  cinder:
    volumeID: a198bce4-ba0f-4d13-8f0c-55e31212a8c9 # 改路径为映射到本机的  /var/lib/kubelet/plugins/kubernetes.io/cinder/mounts
    fsType: ext4

注意:

1 .?pv 的storageClassName和pvc的storageClassName要保持一致，否则绑定不上。

2 .?按需要分配 storage。

3 .??使用cinder挂载时，会将指定的volumID挂载到 /var/lib/kubelet/plugins/kubernetes.io/cinder/mounts 目录下，如果没有该目录，那么需要手动创建?/var/lib/kubelet/plugins/kubernetes.io/cinder/mounts 目录。volumeID的值为/var/lib/kubelet/plugins/kubernetes.io/cinder/mounts 下的目录名。

4.?accessModes 设置为 ReadWriteOnce，表示该pv或pvc只能被一个容器所使用。

编写mysql-pvc.yaml文件

---
apiVersion: v1
kind: Service
metadata:
  name: mysql-01
spec:
  ports:
    - port: 3306
      nodePort: 30060
  selector:
    app: mysql-01
  type: NodePort
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql-01
  labels:
    app: mysql-01
spec:
  replicas: 1 # pod数量
  selector:
    matchLabels:
      app: mysql-01
  template:
    metadata:
      labels:
        app: mysql-01
    spec:
      containers:
        - name: mysql-01
          image: mysql:5.7
          imagePullPolicy: IfNotPresent
          resources:
            limits:
              memory: "512Mi"
              cpu: "1500m"
          ports:
            - containerPort: 3306
          env:
            - name: MYSQL_ROOT_PASSWORD
              value: "123456"
          volumeMounts:
            - name: mysql-01-persistent-storage
              mountPath: /var/lib/mysql
            - name: mysql-01-conf
              mountPath: /etc/mysql
      volumes:
        - name: mysql-01-persistent-storage
          persistentVolumeClaim:
            claimName: mysql-01-pvc
        - name: mysql-01-conf
          configMap:
            name: my.cnf
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: my.cnf
data:
  my.cnf: |
    [mysqld]
    skip-grant-tables
    port = 3306
    character-set-server=utf8mb4
    collation-server=utf8mb4_unicode_ci
    skip-character-set-client-handshake=1
    default-storage-engine=INNODB
    max_allowed_packet = 500M
    explicit_defaults_for_timestamp=1
    long_query_time = 10

可在[mysqlId] 里加入??skip-grant-tables跳过权限验证。

执行kubectl apply -f mysql-pvc.yaml 命令。

可使用 kubectl get pv 和 kubectl get pvc 查看pv和pvc。