k8s有状态部署mysql主从(local pv持久化)

1、修改自己对应的命名空间

2、local pv的方式必须先创建好目录在给权限

3、sts部署文件密码都要修改好在部署

yaml资源文件如下：

#配置mysql的root密码再部署，如果部署了在修改root密码就会失败，必须在初始化就把root密码修改好
#部署采用的local pv的模式持久化本地

#  local-sc.yml 
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: local-path
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer  #延迟绑定参数，很重要

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-mysql-1
spec :
  capacity:
    storage: 5Gi
  volumeMode: Filesystem
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: local-path
  local:
    path: /data/mysql-1
  nodeAffinity:
    required:
      nodeSelectorTerms:
        - matchExpressions:
            - key: kubernetes.io/hostname
              operator: In
              values :
                - cole-k8s-worker1

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-mysql-2
spec :
  capacity:
    storage: 5Gi
  volumeMode: Filesystem
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: local-path
  local:
    path: /data/mysql-2
  nodeAffinity:
    required:
      nodeSelectorTerms:
        - matchExpressions:
            - key: kubernetes.io/hostname
              operator: In
              values :
                - cole-k8s-worker2
                
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-mysql-3
spec :
  capacity:
    storage: 5Gi
  volumeMode: Filesystem
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: local-path
  local:
    path: /data/mysql-3
  nodeAffinity:
    required:
      nodeSelectorTerms:
        - matchExpressions:
            - key: kubernetes.io/hostname
              operator: In
              values :
                - cole-k8s-worker3


---

#application/mysql/mysql-configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: mysql
  namespace: public-midd
  labels:
    app: mysql
data:
  master.cnf: |
    # Apply this config only on the master.
    [mysqld]
    log-bin
  slave.cnf: |
    # Apply this config only on slaves.
    [mysqld]
    super-read-only
---
# application/mysql/mysql-services.yaml
# Headless service for stable DNS entries of StatefulSet members.
apiVersion: v1
kind: Service
metadata:
  name: mysql
  namespace: public-midd
  labels:
    app: mysql
spec:
  ports:
    - name: mysql
      port: 3306
  clusterIP: None
  selector:
    app: mysql
---
# Client service for connecting to any MySQL instance for reads.
# For writes, you must instead connect to the master: mysql-0.mysql.
apiVersion: v1
kind: Service
metadata:
  name: mysql-read
  namespace: public-midd
  labels:
    app: mysql
spec:
  ports:
    - name: mysql
      port: 3306
  selector:
    app: mysql
---
#application/mysql/mysql-statefulset.yaml

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mysql
  namespace: public-midd
spec:
  selector:
    matchLabels:
      app: mysql
  serviceName: mysql
  replicas: 3
  template:
    metadata:
      labels:
        app: mysql
    spec:
      # 设置初始化容器，进行一些准备工作
      initContainers:
        - name: init-mysql
          image: mysql:5.7
          # 为每个MySQL节点配置service-id
          # 如果节点序号是0，则使用master的配置， 其余节点使用slave的配置
          command:
            - bash
            - "-c"
            - |
              set -ex
              # Generate mysql server-id from pod ordinal index.
              
              [[ `uname -n` =~ -([0-9]+)$ ]] || exit 1
              ordinal=${BASH_REMATCH[1]}
              echo [mysqld] > /mnt/conf.d/server-id.cnf
              # Add an offset to avoid reserved server-id=0 value.
              echo server-id=$((100 + $ordinal)) >> /mnt/conf.d/server-id.cnf
              # Copy appropriate conf.d files from config-map to emptyDir.
              if [[ $ordinal -eq 0 ]]; then
                cp /mnt/config-map/master.cnf /mnt/conf.d/
              else
                cp /mnt/config-map/slave.cnf /mnt/conf.d/
              fi
          volumeMounts:
            - name: time-localtime
              mountPath: /etc/localtime
              readOnly: true
            - name: conf
              mountPath: /mnt/conf.d
            - name: config-map
              mountPath: /mnt/config-map
        - name: clone-mysql
          image: yizhiyong/xtrabackup:latest
          # 为除了节点序号为0的主节点外的其它节点，备份前一个节点的数据
          command:
            - bash
            - "-c"
            - |
              set -ex
              # Skip the clone if data already exists.
              [[ -d /var/lib/mysql/mysql ]] && exit 0
              # Skip the clone on master (ordinal index 0).
              [[ `uname -n` =~ -([0-9]+)$ ]] || exit 1
              ordinal=${BASH_REMATCH[1]}
              [[ $ordinal -eq 0 ]] && exit 0
              # Clone data from previous peer.
              ncat --recv-only mysql-$(($ordinal-1)).mysql 3307 | xbstream -x -C /var/lib/mysql
              # Prepare the backup.
              xtrabackup --prepare --target-dir=/var/lib/mysql
          volumeMounts:
            - name: time-localtime
              mountPath: /etc/localtime
              readOnly: true
            - name: data
              mountPath: /var/lib/mysql
              subPath: mysql
            - name: conf
              mountPath: /etc/mysql/conf.d
      containers:
        - name: mysql
          image: mysql:5.7
          # 设置支持免密登录
          env:
            # - name: MYSQL_ALLOW_EMPTY_PASSWORD
              # value: "1"
            - name: MYSQL_ROOT_PASSWORD
              value: "123456"
            
          ports:
            - name: mysql
              containerPort: 3306
          volumeMounts:
            - name: time-localtime
              mountPath: /etc/localtime
              readOnly: true
            - name: data
              mountPath: /var/lib/mysql
              subPath: mysql
            - name: conf
              mountPath: /etc/mysql/conf.d
          resources:
            # 设置启动pod需要的资源，官方文档上需要500m cpu，1Gi memory。
            # 我本地测试的时候，会因为资源不足，报1 Insufficient cpu, 1 Insufficient memory错误，所以我改小了点
            requests:
              # m是千分之一的意思，100m表示需要0.1个cpu
              cpu: 100m
              # Mi是兆的意思，需要100M 内存
              memory: 100Mi
          livenessProbe:
            # 使用mysqladmin ping命令，对MySQL节点进行探活检测
            # 在节点部署完30秒后开始，每10秒检测一次，超时时间为5秒
            exec:
              command: [ "mysqladmin", "ping" ]
            initialDelaySeconds: 30
            periodSeconds: 10
            timeoutSeconds: 5
          readinessProbe:
            # 对节点服务可用性进行检测， 启动5秒后开始，每2秒检测一次，超时时间1秒
            exec:
              # Check we can execute queries over TCP (skip-networking is off).
              command: [ "mysql", "-h", "127.0.0.1", "-p123456", "-e", "SELECT 1" ]
            initialDelaySeconds: 5
            periodSeconds: 2
            timeoutSeconds: 1
        - name: xtrabackup
          
          image: yizhiyong/xtrabackup:latest
          ports:
            - name: xtrabackup
              containerPort: 3307
          # 开始进行备份文件校验、解析和开始同步
          command:
            - bash
            - "-c"
            - |
              set -ex
              cd /var/lib/mysql
              # Determine binlog position of cloned data, if any.
              if [[ -f xtrabackup_slave_info && "x$( change_master_to.sql.in
                # Ignore xtrabackup_binlog_info in this case (it's useless).
                rm -f xtrabackup_slave_info xtrabackup_binlog_info
              elif [[ -f xtrabackup_binlog_info ]]; then
                # We're cloning directly from master. Parse binlog position.
                [[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]]+(.*?)$ ]] || exit 1
                rm -f xtrabackup_binlog_info xtrabackup_slave_info
                echo "CHANGE MASTER TO MASTER_LOG_FILE='${BASH_REMATCH[1]}',\
                      MASTER_LOG_POS=${BASH_REMATCH[2]}" > change_master_to.sql.in
              fi
              # Check if we need to complete a clone by starting replication.
              if [[ -f change_master_to.sql.in ]]; then
                echo "Waiting for mysqld to be ready (accepting connections)"
                until mysql -h 127.0.0.1 -p"123456" -e "SELECT 1"; do sleep 1; done
                echo "Initializing replication from clone position"
                mysql -h 127.0.0.1 -p"123456"\
                      -e "$(