k8s部署mysql

（作者：陈玓玏）
一、前置条件
已部署k8s，服务端版本为1.21.14

二、部署mysql

拉取镜像；

docker pull mysql

将账号密码等信息写到configmap，创建configmap；

apiVersion: v1
kind: ConfigMap
metadata:
  name: mysql-config
  labels:
    app: mysql
data:
  MYSQL_ROOT_PASSWORD: "123456"

执行下面的命令来创建configmap。mysql默认都是Root用户，所以只填了个密码。

kubectl apply -f  mysql-cm.yaml

持久卷声明，创建pv和pvc，用于数据的持久化存储：

kind: PersistentVolume
apiVersion: v1
metadata:
  name: mysql-pv-volume
  labels:
    type: local
    app: mysql
spec:
  storageClassName: manual
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteMany
  hostPath:
    path: "/home/mysql/data"
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: mysql-pv-claim
  labels:
    app: mysql
spec:
  storageClassName: manual
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 5Gi

执行下面的命令来创建pv及pvc。

kubectl apply -f  mysql-pv-pvc.yaml

创建deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql-deployment
spec:
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: mysql
  replicas: 1
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
        - name: mysql
          image: mysql:8.0.32
          imagePullPolicy: "IfNotPresent"
          ports:
            - containerPort: 3306
          envFrom:
            - configMapRef:
                name: mysql-config
          volumeMounts:
            - mountPath: /var/lib/mysql
              name: mysqldb
      volumes:
        - name: mysqldb
          persistentVolumeClaim:
            claimName: mysql-pv-claim

kubectl创建deployment。这一步一开始我mountPath搞错了，然后在k8sdashboard上看pod日志才发现哪里错了，所以验证有问题时要注意排查。

创建service

apiVersion: v1
kind: Service
metadata:
  name: mysql-service
  labels:
    app: mysql
spec:
  type: NodePort
  ports:
  - port: 3306
    targetPort: 3306
    protocol: TCP
  selector:
   app: mysql

kubectl创建service。