K8S部署MySQL主从环境

1.创建mysql主从环境的命名空间

bash 复制代码

[root@k8s-master1 mysql]# kubectl create ns mysql
namespace/mysql created

2.创建master的pvc

bash 复制代码

[root@k8s-master1 mysql]# cat mysql-master-pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pvc
  namespace: mysql
  annotations:
    volume.beta.kubernetes.io/storage-class: "nfs-client"
spec:
  resources:
    requests:
      storage: 5Gi
  volumeMode: Filesystem
  accessModes:
    - ReadWriteOnce
[root@k8s-master1 mysql]# kubectl apply -f mysql-master-pvc.yaml
persistentvolumeclaim/mysql-pvc created

3.创建mysql-master的headliness

bash 复制代码

[root@k8s-master1 mysql]# cat mysql-master-headliness.yaml
kind: Service
apiVersion: v1
metadata:
  name: mysql-master-hs
  namespace:  mysql
  labels:
    app: mysql-master-ss
spec:
  selector:
    app: mysql-master-ss
  clusterIP: None
  ports:
    - port: 3306
      targetPort: 3306
[root@k8s-master1 mysql]# kubectl apply -f mysql-master-headliness.yaml
service/mysql-master-hs created

4.创建mysql-master-service对外访问

bash 复制代码

[root@k8s-master1 mysql]# cat mysql-master-service.yaml
apiVersion: v1
kind: Service
metadata:
  name: mysql-master-service
  namespace: mysql
spec:
  type: NodePort
  selector:
    app: mysql-master-ss
  ports:
  - port: 3306
    targetPort: 3306
    nodePort: 42222
[root@k8s-master1 mysql]# kubectl apply -f mysql-master-service.yaml
service/mysql-master-service created

5.创建mysql-master部署文件

bash 复制代码

[root@k8s-master1 mysql]# cat mysql-master-StatefulSet.yaml
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mysql-master-ss
  namespace: mysql
  labels:
    app: mysql-master-ss
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mysql-master-ss
  serviceName: mysql-master-hs
  template:
    metadata:
      labels:
        app: mysql-master-ss
    spec:
      containers:
      - name: mysql
        image: mysql:5.7.35
        ports:
        - containerPort: 3306
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: "mysql123"
        - name: MYSQL_REPLICATION_USER
          value: "repl"
        - name: MYSQL_REPLICATION_PASSWORD
          value: "repl123"
        volumeMounts:
        - name: mysql-data
          mountPath: /var/lib/mysql
        args:
          - --log-bin=mysql-bin
          - --binlog-ignore-db=mysql
          - --server-id=1001
          - --symbolic-links=0
          - --sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
  volumeClaimTemplates:
    - metadata:
        name: mysql-data
      spec:
        accessModes: ["ReadWriteOnce"]
        storageClassName: nfs-client
        resources:
          requests:
            storage: 5Gi
[root@k8s-master1 mysql]# kubectl apply -f mysql-master-StatefulSet.yaml
statefulset.apps/mysql-master-ss created

6.检查服务启动情况

bash 复制代码

[root@k8s-master1 mysql]# kubectl get all -n mysql
NAME                    READY   STATUS    RESTARTS   AGE
pod/mysql-master-ss-0   1/1     Running   0          48s

NAME                           TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
service/mysql-master-hs        ClusterIP   None            <none>        3306/TCP         6m22s
service/mysql-master-service   NodePort    10.255.42.172   <none>        3306:42222/TCP   2m43s

NAME                               READY   AGE
statefulset.apps/mysql-master-ss   1/1     48s

7.创建mysql-slave的pvc

bash 复制代码

[root@k8s-master1 mysql]# cat mysql-slave-pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-slave-pvc
  namespace: mysql
  annotations:
    volume.beta.kubernetes.io/storage-class: "nfs-client"
spec:
  resources:
    requests:
      storage: 5Gi
  volumeMode: Filesystem
  accessModes:
    - ReadWriteOnce
[root@k8s-master1 mysql]# kubectl apply -f mysql-slave-pvc.yaml
persistentvolumeclaim/mysql-slave-pvc created

8.建mysql-slave的headliness和service用来对外访问（slave节点可以不创建service)

bash 复制代码

[root@k8s-master1 mysql]# cat mysql-slave-headliness.yaml
kind: Service
apiVersion: v1
metadata:
  name: mysql-slave-headliness
  namespace:  mysql
  labels:
    app: mysql-slave-ss
spec:
  selector:
    app: mysql-slave-ss
  clusterIP: None
  ports:
    - port: 3306
      targetPort: 3306
[root@k8s-master1 mysql]# kubectl apply -f mysql-slave-headliness.yaml
service/mysql-slave-headliness created

[root@k8s-master1 mysql]# cat mysql-slave-service.yaml
apiVersion: v1
kind: Service
metadata:
  name: mysql-slave-service
  namespace: mysql
spec:
  type: NodePort
  selector:
    app: mysql-slave-ss
  ports:
  - port: 3306
    targetPort: 3306
    nodePort: 42223
[root@k8s-master1 mysql]# kubectl apply -f mysql-slave-service.yaml
service/mysql-slave-service created

9.创建mysql-slave部署文件(mysql-serverid不能一样一定要区分开)

bash 复制代码

[root@k8s-master1 mysql]# cat mysql-slave-StatefulSet.yaml
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mysql-slave-ss
  namespace: mysql
  labels:
    app: mysql-slave-ss
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mysql-slave-ss
  serviceName: mysql-slave-headliness
  template:
    metadata:
      labels:
        app: mysql-slave-ss
    spec:
      containers:
      - name: mysql
        image: mysql:5.7.35
        ports:
        - containerPort: 3306
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: "mysql123"
        - name: MYSQL_REPLICATION_USER
          value: "repl"
        - name: MYSQL_REPLICATION_PASSWORD
          value: "repl123"
        volumeMounts:
        - name: mysql-data
          mountPath: /var/lib/mysql
        args:
          - --log-bin=mysql-bin
          - --binlog-ignore-db=mysql
          - --server-id=2002
          - --symbolic-links=0
          - --sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
  volumeClaimTemplates:
    - metadata:
        name: mysql-data
      spec:
        accessModes: ["ReadWriteOnce"]
        storageClassName: nfs-client
        resources:
          requests:
            storage: 5Gi

10.检查服务的启动情况

bash 复制代码

[root@k8s-master1 mysql]# kubectl get pods -n mysql -o wide
NAME                READY   STATUS    RESTARTS   AGE     IP              NODE          NOMINATED NODE   READINESS GATES
mysql-master-ss-0   1/1     Running   0          7m40s   10.10.135.211   k8s-master3   <none>           <none>
mysql-slave-ss-0    1/1     Running   0          23s     10.10.135.208   k8s-master3   <none>           <none>

11.配置主从同步

bash 复制代码

[root@k8s-master1 mysql]# kubectl exec -it mysql-master-ss-0 -n mysql bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
root@mysql-master-ss-0:/#
root@mysql-master-ss-0:/# mysql -u root -pmysql123
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.35-log MySQL Community Server (GPL)

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>
创建slave库授权账号
mysql> GRANT REPLICATION SLAVE ON *.* to 'repl'@'%' IDENTIFIED  by 'repl123';
Query OK, 0 rows affected, 1 warning (0.01 sec)
 获取二进制日志
 mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000003 |      437 |              | mysql            |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

 进入slave库启动同步功能 
 mysql> change master to master_host='mysql-master-hs.mysql',master_user='repl',master_password='repl123',master_log_file='mysql-bin.000003',master_log_pos=437 ;
Query OK, 0 rows affected, 2 warnings (0.03 sec)
开启同步
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
检查同步状态
mysql> show slave status \G;

12。验证同步