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在ubuntu上搭建mysql集群可以通過多種方式實現，包括使用mysql cluster、kubernetes的statefulset等。以下是使用kubernetes的statefulset部署mysql主從集群的詳細步驟：

準備工作

創建Namespace

apiVersion: v1 kind: Namespace metadata:   name: mysql labels:   app: mysql

配置密碼Secret

apiVersion: v1 kind: Secret metadata:   name: mysql-secret namespace: mysql labels:   app: mysql type: Opaque data:   password: MTIzNDU2  # base64編碼的密碼，生產環境建議使用更復雜的密碼

主從配置分離

創建ConfigMap

主節點配置（master.cnf）

apiVersion: v1 kind: ConfigMap metadata:   name: mysql namespace: mysql data:   master.cnf: |     [mysqld]     log-bin=mysql-bin     skip-name-resolves

從節點配置（slave.cnf）

apiVersion: v1 kind: ConfigMap metadata:   name: mysql namespace: mysql data:   slave.cnf: |     [mysqld]     super-read-only     log-bin=mysql-bin     replicate-ignore-db=mysql

網絡服務配置

Headless Service

apiVersion: v1 kind: Service metadata:   name: mysql namespace: mysql labels:   app: mysql spec:   ports:   - name: mysql     port: 3306   clusterIP: None   selector:     app: mysql

讀寫分離Service

apiVersion: v1 kind: Service metadata:   name: mysql-read namespace: mysql labels:   app: mysql spec:   ports:   - name: mysql     port: 3306   selector:     app: mysql

核心StatefulSet部署

apiVersion: apps/v1 kind: StatefulSet metadata:   name: mysql namespace: mysql spec:   selector:     matchLabels:       app: mysql   serviceName: "mysql"   replicas: 2   template:     metadata:       labels:         app: mysql     spec:       initContainers:       - name: init-mysql         image: mysql:5.7         env:         - name: MYSQL_ROOT_PASSWORD           valueFrom:             secretKeyRef:               name: mysql-secret               key: password         command:         - bash         - "-c"         - |           set -ex           ordinal=$(hostname | awk '{print $NF}')           echo "[mysqld] > /mnt/conf.d/server-id.cnf"           echo "server-id=$((100   $ordinal))" >> /mnt/conf.d/server-id.cnf           if [ $ordinal -eq 0 ]; then             echo "server-id=100" >> /mnt/conf.d/server-id.cnf           else             echo "server-id=$((100   $ordinal))" >> /mnt/conf.d/server-id.cnf           fi       containers:       - name: mysql         image: mysql:5.7         env:         - name: MYSQL_ROOT_PASSWORD           valueFrom:             secretKeyRef:               name: mysql-secret               key: password         ports:         - containerPort: 3306         volumeMounts:         - name: mysql-persistent-data           mountPath: /var/lib/mysql   volumeClaimTemplates:   - metadata:       name: mysql-persistent-data     spec:       AccessModes: [ "ReadWriteOnce" ]       resources:         requests:           storage: 10Gi