郑州市做网站的,科技霸权,公司起名字大全免费好听,建设工程教育网一建论坛以下是一个基于Kubernetes部署MySQL主从集群的详细YAML示例#xff0c;包含StatefulSet、Service、ConfigMap和Secret等关键配置。MySQL主从集群需要至少1个主节点和多个从节点#xff0c;这里使用 StatefulSet 初始化脚本 实现主从自动配置。 1. 创建 Namespace (可选)
ap…以下是一个基于Kubernetes部署MySQL主从集群的详细YAML示例包含StatefulSet、Service、ConfigMap和Secret等关键配置。MySQL主从集群需要至少1个主节点和多个从节点这里使用 StatefulSet 初始化脚本 实现主从自动配置。 1. 创建 Namespace (可选)
apiVersion: v1
kind: Namespace
metadata:name: mysql-cluster2. 创建 Secret (存储MySQL密码)
apiVersion: v1
kind: Secret
metadata:name: mysql-secretsnamespace: mysql-cluster
type: Opaque
data:root-password: eHg # echo -n xx | base64 (示例密码)replication-password: eHg # 主从同步专用密码3. 创建 ConfigMap (主从配置文件)
apiVersion: v1
kind: ConfigMap
metadata:name: mysql-confignamespace: mysql-cluster
data:master.cnf: |[mysqld]log-binmysql-binserver-id1slave.cnf: |[mysqld]log-binmysql-binserver-id2init.sql: | # 初始化主从复制的SQL脚本CREATE USER repl% IDENTIFIED BY xx; # 密码需与Secret中一致GRANT REPLICATION SLAVE ON *.* TO repl%;FLUSH PRIVILEGES;4. 创建 Service (主从分离访问)
# 主节点服务
apiVersion: v1
kind: Service
metadata:name: mysql-masternamespace: mysql-cluster
spec:ports:- name: mysqlport: 3306selector:app: mysqlrole: masterclusterIP: None# 从节点服务
apiVersion: v1
kind: Service
metadata:name: mysql-slavenamespace: mysql-cluster
spec:ports:- name: mysqlport: 3306selector:app: mysqlrole: slaveclusterIP: None5. 创建 StatefulSet (1主2从)
apiVersion: apps/v1
kind: StatefulSet
metadata:name: mysqlnamespace: mysql-cluster
spec:serviceName: mysqlreplicas: 3selector:matchLabels:app: mysqltemplate:metadata:labels:app: mysqlrole: slave # 默认标记为slaveinit容器中将修改第一个Pod为masterspec:initContainers:- name: init-mysqlimage: mysql:8.0command:- bash- -c- |# 根据Pod序号分配server-id和角色[[ hostname ~ -([0-9])$ ]] || exit 1ordinal${BASH_REMATCH[1]}if [[ $ordinal -eq 0 ]]; then# 主节点配置cp /mnt/config/master.cnf /mnt/conf.d/echo rolemaster /mnt/conf.d/roleelse# 从节点配置cp /mnt/config/slave.cnf /mnt/conf.d/echo roleslave /mnt/conf.d/rolefivolumeMounts:- name: confmountPath: /mnt/conf.d- name: config-mapmountPath: /mnt/config- name: clone-mysqlimage: alpine:3.18command:- bash- -c- |# 只有从节点需要等待主节点初始化完成if [ -f /mnt/conf.d/role ] grep -q slave /mnt/conf.d/role; thenuntil nslookup mysql-0.mysql; dosleep 2donefivolumeMounts:- name: confmountPath: /mnt/conf.dcontainers:- name: mysqlimage: mysql:8.0env:- name: MYSQL_ROOT_PASSWORDvalueFrom:secretKeyRef:name: mysql-secretskey: root-password- name: MYSQL_REPL_PASSWORDvalueFrom:secretKeyRef:name: mysql-secretskey: replication-passwordports:- name: mysqlcontainerPort: 3306volumeMounts:- name: datamountPath: /var/lib/mysql- name: confmountPath: /etc/mysql/conf.d- name: init-sqlmountPath: /docker-entrypoint-initdb.dlivenessProbe:exec:command: [mysqladmin, ping, -uroot, -p${MYSQL_ROOT_PASSWORD}]initialDelaySeconds: 30periodSeconds: 10readinessProbe:exec:command: [mysql, -uroot, -p${MYSQL_ROOT_PASSWORD}, -e, SELECT 1]initialDelaySeconds: 5periodSeconds: 5volumes:- name: confemptyDir: {}- name: config-mapconfigMap:name: mysql-configitems:- key: master.cnfpath: master.cnf- key: slave.cnfpath: slave.cnf- name: init-sqlconfigMap:name: mysql-configitems:- key: init.sqlpath: init.sqlvolumeClaimTemplates:- metadata:name: dataspec:accessModes: [ReadWriteOnce]storageClassName: standard # 根据环境调整resources:requests:storage: 10Gi6. 主从初始化自动化脚本 (StatefulSet启动后执行)
主节点启动后自动创建复制用户从节点自动连接主节点
# 在StatefulSet的Pod模板中添加以下生命周期钩子
lifecycle:postStart:exec:command:- /bin/bash- -c- |if [ -f /etc/mysql/conf.d/role ] grep -q master /etc/mysql/conf.d/role; then# 主节点执行初始化SQLmysql -uroot -p${MYSQL_ROOT_PASSWORD} /docker-entrypoint-initdb.d/init.sqlelse# 从节点配置主从复制until mysql -h mysql-0.mysql -uroot -p${MYSQL_ROOT_PASSWORD} -e SELECT 1; dosleep 1donemysql -uroot -p${MYSQL_ROOT_PASSWORD} -e CHANGE MASTER TOMASTER_HOSTmysql-0.mysql,MASTER_USERrepl,MASTER_PASSWORD${MYSQL_REPL_PASSWORD},MASTER_AUTO_POSITION1;START SLAVE;fi验证主从同步
# 检查主节点状态
kubectl exec -it mysql-0 -n mysql-cluster -- mysql -uroot -p -e SHOW MASTER STATUS\G# 检查从节点同步状态
kubectl exec -it mysql-1 -n mysql-cluster -- mysql -uroot -p -e SHOW SLAVE STATUS\G关键注意事项
主节点高可用此方案主节点单点若需高可用需结合 Orchestrator 或 ProxySQL 实现故障转移。数据持久化确保 storageClassName 与实际存储系统匹配如 rook-cephfs、nfs。密码安全通过Secret管理敏感信息禁止明文存储。网络通信确保StatefulSet的Pod之间可通过DNS名称互相访问如 mysql-0.mysql.mysql-cluster.svc.cluster.local。扩展性通过增加 replicas 数量扩展从节点。 完整架构示意图
Client - Service(mysql-master) - Pod(mysql-0) [Master]
Client - Service(mysql-slave) - Pod(mysql-1, mysql-2) [Slave]可根据需求调整副本数量或增加读写分离中间件如ProxySQL。
