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实验环境：
两台centos7服务器做mysql主服务器：master01/master02；
两台centos7服务器做mysql从服务器：slave01/slave02；
一台centos7服务器做监控服务器：monitor
问题一：master01 创建新的数据库abc，slave01上查看，未进行未进行数据同步。
master01数据库查询如下：
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| abc |
| mysql |
| performance_schema |
| test |
slave01数据库查询如下：
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
//新建的数据表未进行同步
解决过程：
1、查看slave01的配置情况：
MariaDB [(none)]> show slave status\G
Last_IO_Error: error connecting to master 'replication@192.168.109.129:3306' - retry-0 message: Access denied for
user 'replication'@'192.168.109.159' (using password: YES)
//看不懂...
//重新启动服务，出现新的报错
MariaDB [(none)]> stop slave;
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> start slave
-> ;
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show slave status\G;
Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids; these ids
must be different for replication to work (or the --replicate-same-server-id option must be used on slave s does not
always make sense; please check the manual before using it). //大概意思为使用了相同的server-id
2、配置文件中进行查看
vim /etc/my.cnf //发现与master01的server-id都设置成了1
进行修改为不同的server-id
3、重新启动服务
[root@localhost ~]# systemctl stop mariadb.service
[root@localhost ~]# systemctl start mariadb.service
[root@localhost ~]# systemctl start mysql-mmm-agent.service
[root@localhost ~]# systemctl enable mysql-mmm-agent.service
4、使用moniror查看同步情况
[root@localhost mysql-mmm]# mmm_control show
ERROR: Can't connect to monitor daemon! //还是不行！！
问题二：moniror服务器无法获取节点情况，报错如下：
MariaDB [(none)]> show slave status\G
Last_Error: Error 'Can't drop database 'school'; database doesn't exist' on query. Default
databasool'. Query: 'drop database school'
解决过程：
1、看报错信息，可以得知是我在之前进行主主服务器同步情况测试时，创建删除的school数据库，由于slave从服务器还未进行同步，进程卡住，无法进行下一步操作，所以，部署才未能成功。
2、在从服务器上手动创建一个新的school数据库，让系统识别到后，自动删除一次次数据库就可以了
MariaDB [(none)]> create database school;
Query OK, 1 row affected (0.00 sec)
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| school |
| test |
+--------------------+
3、如果还是不行，则退出数据库，进行重启服务
MariaDB [(none)]> quit
Bye
[root@slave02 ~]#
[root@slave02 ~]# systemctl restart mariadb.service
4、再次进入数据库查看，school数据库已自动删除，且与master01数据库相同。
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| abc |
| mysql |
| performance_schema |
| test |
+--------------------+
5、使用监控服务器monitor查看节点成功
[root@localhost mysql-mmm]# mmm_control show
db1(192.168.109.129) master/ONLINE. Roles: writer(192.168.109.188)
db2(192.168.109.160) master/ONLINE. Roles:
db3(192.168.109.162) slave/ONLINE. Roles: reader(192.168.109.189)
db4(192.168.109.159) slave/ONLINE. Roles: reader(192.168.109.190)
试验成功。
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