k8s-mysql主从部署

一.环境信息

mysql版本 :8.0

k8s 版本1.22

使用nfs作为共享存储

二.配置mysql主节点yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: mysql-master-config
  namespace: mysql
  labels:
    app: mysql-master-config
data:
  my.cnf: |+
    [client]
    default-character-set=utf8
    [mysql]
    default-character-set=utf8
    [mysqld]
    init_connect='SET collation_connection = utf8_unicode_ci'
    init_connect='SET NAMES utf8'
    character-set-server=utf8
    lower_case_table_names=1
    sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
    collation-server=utf8_unicode_ci
    skip-character-set-client-handshake
    skip-name-resolve
    pid-file        = /var/run/mysqld/mysqld.pid
    socket          = /var/run/mysqld/mysqld.sock
    datadir         = /var/lib/mysql
    secure-file-priv= NULL
    # Disabling symbolic-links is recommended to prevent assorted security risks
    symbolic-links=0
    # 主从同步
    server-id = 1
    log-bin = mysql-bin
    sync_binlog = 1
    binlog_checksum = none
    binlog_format = mixed
    slave-skip-errors = all
    event_scheduler = 1
    max_allowed_packet = 64M
    # Custom config should go here
    !includedir /etc/mysql/conf.d/
---
# headless service
apiVersion: v1
kind: Service
metadata:
  name: mysql-master-svc
  namespace: mysql
  labels:
    app: mysql-master-svc
spec:
  clusterIP: None
  ports:
  - name: master-port
    port: 3306
  selector:
    app: mysql-master
---
# NodePort service
apiVersion: v1
kind: Service
metadata:
  name: mysql-master-nodeport
  namespace: mysql
  labels:
    app: mysql-master-nodeport
spec:
  clusterIP:
  ports:
  - name: master-port
    port: 3306
    nodePort: 31306
    targetPort: 3306
  selector:
    app: mysql-master
  type: NodePort
  target-port:
  externalTrafficPolicy: Cluster
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mysql-master
  namespace: mysql
spec:
  serviceName: "mysql-master-svc"
  replicas: 1
  selector:
    matchLabels:
      app: mysql-master
  template:
    metadata:
      labels:
        app: mysql-master
    spec:
      containers:
      - name: mysql-master
        image: mysql:8.0.20
        ports:
        - containerPort: 3306
          name: master-port
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: "root"
        - name: TZ
          value: "Asia/Shanghai"
        volumeMounts:
        - name: mycnf
          mountPath: /etc/mysql/my.cnf
          subPath: my.cnf
        - name: mysql-master-data
          mountPath: /var/lib/mysql
      volumes:
      - name: mycnf
        configMap:
          name: mysql-master-config
      - name: mysql-master-data
        nfs:
          server: 192.168.110.190 
          path: /data/data/mysql-master
 

三.配置mysql从节点yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: mysql-slave-config
  namespace: mysql
  labels:
    app: mysql-slave-config
data:
  my.cnf: |+
    [client]
    default-character-set=utf8
    [mysql]
    default-character-set=utf8
    [mysqld]
    init_connect='SET collation_connection = utf8_unicode_ci'
    init_connect='SET NAMES utf8'
    character-set-server=utf8
    lower_case_table_names=1
    sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
    collation-server=utf8_unicode_ci
    skip-character-set-client-handshake
    skip-name-resolve
    pid-file        = /var/run/mysqld/mysqld.pid
    socket          = /var/run/mysqld/mysqld.sock
    datadir         = /var/lib/mysql
    secure-file-priv= NULL
    # Disabling symbolic-links is recommended to prevent assorted security risks
    symbolic-links=0
    # 主从同步
    server-id = 2
    log-bin = mysql-bin
    sync_binlog = 1
    binlog_checksum = none
    binlog_format = mixed
    slave-skip-errors = all
    event_scheduler = 1
    max_allowed_packet = 64M
    read-only=1
    # Custom config should go here
    !includedir /etc/mysql/conf.d/
---
# headless service
apiVersion: v1
kind: Service
metadata:
  name: mysql-slave-svc
  namespace: mysql
  labels:
    app: mysql-slave-svc
spec:
  clusterIP: None
  ports:
  - name: slave-port
    port: 3306
  selector:
    app: mysql-slave
---
# NodePort service
apiVersion: v1
kind: Service
metadata:
  name: mysql-slave-nodeport
  namespace: mysql
  labels:
    app: mysql-slave-nodeport
spec:
  clusterIP:
  ports:
  - name: slave-port
    port: 3306
    nodePort: 31307
    targetPort: 3306
  selector:
    app: mysql-slave
  type: NodePort
  target-port:
  externalTrafficPolicy: Cluster
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mysql-slave
  namespace: mysql
spec:
  serviceName: "mysql-slave-svc"
  replicas: 1
  selector:
    matchLabels:
      app: mysql-slave
  template:
    metadata:
      labels:
        app: mysql-slave
    spec:
      containers:
      - name: mysql-slave
        image: mysql:8.0.20
        ports:
        - containerPort: 3306
          name: slave-port
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: "root"
        - name: TZ
          value: "Asia/Shanghai"
        volumeMounts:
        - name: mycnf
          mountPath: /etc/mysql/my.cnf
          subPath: my.cnf
        - name: mysql-slave-data
          mountPath: /var/lib/mysql
      volumes:
      - name: mycnf
        configMap:
          name: mysql-slave-config
      - name: mysql-slave-data
        nfs:
          server: 192.168.110.190 
          path: /data/data/mysql-slave

三、主从配置

主节点操作

获取mysql的内部ip 

kubectl get svc -n mysql

1.登录主节点

MySQL mysql -h 192.168.40.12 -P 31306 -u root -proot

show master status;

mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000004 |      152 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
2.创建从节点数据同步用户
CREATE USER 'replica'@'%' IDENTIFIED WITH mysql_native_password BY 'replica123';
GRANT REPLICATION SLAVE ON *.* TO 'replica'@'%';
FLUSH PRIVILEGES;
 

 从节点操作

1.登录从节点
mysql -h 192.168.110.190 -P 31307  -u root -proot
2.同步指向主节点
CHANGE MASTER TO MASTER_HOST='mysql-master-svc',MASTER_USER='replica',MASTER_PASSWORD='replica123',MASTER_LOG_FILE='mysql-bin.000004',MASTER_LOG_POS=152,MASTER_PORT=3306;
3.开启同步
start slave;