数据库集群的主从复制模型完整实现-创新互联

主从配置过程: 参看:     https://mariadb.com/kb/en/library/setting-up-replication/     https://dev.mysql.com/doc/refman/5.5/en/replication-configuration.html

主服务器192.168.27.7配置:

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从服务器192.168.27.17服务配置:

从服务器上的配置: [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 # Settings user and group are ignored when systemd is used. innodb_file_per_table server_id=2 注意:默认的server_id是0; MariaDB [(none)]> show variables like 'server_id'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | server_id     | 0     | +---------------+-------+ 1 row in set (0.01 sec) 查看帮助: MariaDB [(none)]> help change master to; CHANGE MASTER TO   MASTER_HOST='master2.mycompany.com',   MASTER_USER='replication',   MASTER_PASSWORD='bigs3cret',   MASTER_PORT=3306,   MASTER_LOG_FILE='master2-bin.001',   MASTER_LOG_POS=4,   MASTER_CONNECT_RETRY=10; MariaDB [(none)]> CHANGE MASTER TO     ->   MASTER_HOST='192.168.27.7',     ->   MASTER_USER='repluser',     ->   MASTER_PASSWORD='centos',     ->   MASTER_PORT=3306,     ->   MASTER_LOG_FILE='mariadb-bin.000001',     ->   MASTER_LOG_POS=245,     ->   MASTER_CONNECT_RETRY=10; Query OK, 0 rows affected (0.02 sec) MariaDB [(none)]> show slave status\G *************************** 1. row ***************************                Slave_IO_State:                    Master_Host: 192.168.27.7                   Master_User: repluser                   Master_Port: 3306                 Connect_Retry: 10               Master_Log_File: mariadb-bin.000001           Read_Master_Log_Pos: 245                Relay_Log_File: mariadb-relay-bin.000001                 Relay_Log_Pos: 4         Relay_Master_Log_File: mariadb-bin.000001              Slave_IO_Running: No     线程未启动;             Slave_SQL_Running: No     线程未启动;               Replicate_Do_DB:            Replicate_Ignore_DB:             Replicate_Do_Table:         Replicate_Ignore_Table:        Replicate_Wild_Do_Table:    Replicate_Wild_Ignore_Table:                     Last_Errno: 0                    Last_Error:                   Skip_Counter: 0           Exec_Master_Log_Pos: 245     复制的起始位置;               Relay_Log_Space: 245               Until_Condition: None                Until_Log_File:                  Until_Log_Pos: 0            Master_SSL_Allowed: No     可以启用加密;            Master_SSL_CA_File:             Master_SSL_CA_Path:                Master_SSL_Cert:              Master_SSL_Cipher:                 Master_SSL_Key:          Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No                 Last_IO_Errno: 0                 Last_IO_Error:                 Last_SQL_Errno: 0                Last_SQL_Error:    Replicate_Ignore_Server_Ids:               Master_Server_Id: 0 1 row in set (0.00 sec)

中继日志已经创建; [root@centos7x ~]$ll /var/lib/mysql/ total 28724 -rw-rw---- 1 mysql mysql    16384 Feb 25 06:37 aria_log.00000001 -rw-rw---- 1 mysql mysql       52 Feb 25 06:37 aria_log_control -rw-rw---- 1 mysql mysql 18874368 Feb 25 06:37 ibdata1 -rw-rw---- 1 mysql mysql  5242880 Feb 25 06:37 ib_logfile0 -rw-rw---- 1 mysql mysql  5242880 Feb 25 05:09 ib_logfile1 -rw-rw---- 1 mysql mysql      264 Feb 25 05:15 mariadb-bin.000001 -rw-rw---- 1 mysql mysql       21 Feb 25 05:10 mariadb-bin.index -rw-rw---- 1 mysql mysql      245 Feb 25 06:38 mariadb-relay-bin.000001 -rw-rw---- 1 mysql mysql       27 Feb 25 06:38 mariadb-relay-bin.index -rw-rw---- 1 mysql mysql       84 Feb 25 06:38 master.info drwx------ 2 mysql mysql     4096 Feb 25 05:09 mysql srwxrwxrwx 1 mysql mysql        0 Feb 25 06:37 mysql.sock drwx------ 2 mysql mysql     4096 Feb 25 05:09 performance_schema -rw-rw---- 1 mysql mysql       52 Feb 25 06:38 relay-log.info drwx------ 2 mysql mysql        6 Feb 25 05:09 test

启动从服务器上的复制线程:

MariaDB [(none)]> start slave; ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id:    4 Current database: *** NONE *** Query OK, 0 rows affected, 1 warning (0.00 sec) MariaDB [(none)]> show databases; +--------------------+ | Database           | +--------------------+ | information_schema | | hellodb            | | mysql              | | performance_schema | | test               | +--------------------+ MariaDB [(none)]> show slave status\G *************************** 1. row ***************************                Slave_IO_State: Waiting for master to send event                   Master_Host: 192.168.27.7                   Master_User: repluser                   Master_Port: 3306                 Connect_Retry: 60               Master_Log_File: mariadb-bin.000002           Read_Master_Log_Pos: 245     读取的日志的位置;                Relay_Log_File: mariadb-relay-bin.000005                 Relay_Log_Pos: 531         Relay_Master_Log_File: mariadb-bin.000002              Slave_IO_Running: Yes             Slave_SQL_Running: Yes               Replicate_Do_DB:            Replicate_Ignore_DB:             Replicate_Do_Table:         Replicate_Ignore_Table:        Replicate_Wild_Do_Table:    Replicate_Wild_Ignore_Table:                     Last_Errno: 0                    Last_Error:                   Skip_Counter: 0           Exec_Master_Log_Pos: 245  执行的日志的位置;               Relay_Log_Space: 1113               Until_Condition: None                Until_Log_File:                  Until_Log_Pos: 0            Master_SSL_Allowed: No            Master_SSL_CA_File:             Master_SSL_CA_Path:                Master_SSL_Cert:              Master_SSL_Cipher:                 Master_SSL_Key:          Seconds_Behind_Master: 0     落后的时间差; Master_SSL_Verify_Server_Cert: No                 Last_IO_Errno: 0                 Last_IO_Error:                 Last_SQL_Errno: 0                Last_SQL_Error:    Replicate_Ignore_Server_Ids:               Master_Server_Id: 1 1 row in set (0.00 sec)

主服务器的读写操作:

主服务器的日志位置; MariaDB [(none)]> show master logs; +--------------------+-----------+ | Log_name           | File_size | +--------------------+-----------+ | mariadb-bin.000001 |      8217 | | mariadb-bin.000002 |       245 | +--------------------+-----------+ 2 rows in set (0.00 sec) 主服务器的写: MariaDB [(none)]> create database wangdb; Query OK, 1 row affected (0.00 sec) MariaDB [(none)]> show master logs; +--------------------+-----------+ | Log_name           | File_size | +--------------------+-----------+ | mariadb-bin.000001 |      8217 | | mariadb-bin.000002 |       332 | +--------------------+-----------+ 2 rows in set (0.00 sec) MariaDB [(none)]> show slave status\G *************************** 1. row ***************************                Slave_IO_State: Waiting for master to send event                   Master_Host: 192.168.27.7                   Master_User: repluser                   Master_Port: 3306                 Connect_Retry: 60               Master_Log_File: mariadb-bin.000002           Read_Master_Log_Pos: 332                Relay_Log_File: mariadb-relay-bin.000003                 Relay_Log_Pos: 618         Relay_Master_Log_File: mariadb-bin.000002              Slave_IO_Running: Yes             Slave_SQL_Running: Yes               Replicate_Do_DB:            Replicate_Ignore_DB:             Replicate_Do_Table:         Replicate_Ignore_Table:        Replicate_Wild_Do_Table:    Replicate_Wild_Ignore_Table:                     Last_Errno: 0                    Last_Error:                   Skip_Counter: 0           Exec_Master_Log_Pos: 332               Relay_Log_Space: 9153               Until_Condition: None                Until_Log_File:                  Until_Log_Pos: 0            Master_SSL_Allowed: No            Master_SSL_CA_File:             Master_SSL_CA_Path:                Master_SSL_Cert:              Master_SSL_Cipher:                 Master_SSL_Key:          Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No                 Last_IO_Errno: 0                 Last_IO_Error:                 Last_SQL_Errno: 0                Last_SQL_Error:    Replicate_Ignore_Server_Ids:               Master_Server_Id: 1 1 row in set (0.00 sec)

从服务器:

从服务器瞬间同步: MariaDB [(none)]> show databases; +--------------------+ | Database           | +--------------------+ | information_schema | | hellodb            | | mysql              | | performance_schema | | test               | | wangdb             | +--------------------+ 6 rows in set (0.00 sec) 停止从服务器;并在主服务器上更新操作; MariaDB [(none)]> create database wangdb2; Query OK, 1 row affected (0.00 sec) MariaDB [(none)]> create database wangdb3; Query OK, 1 row affected (0.00 sec) 从服务器; [root@centos7x ~]$systemctl stop mariadb.service  [root@centos7x ~]$ [root@centos7x ~]$ [root@centos7x ~]$systemctl start mariadb.service  unknown [(none)]> show databases; No connection. Trying to reconnect... Connection id:    4 Current database: *** NONE *** +--------------------+ | Database           | +--------------------+ | information_schema | | hellodb            | | mysql              | | performance_schema | | test               | | wangdb             | | wangdb2            | | wangdb3            | +--------------------+ 8 rows in set (0.00 sec) 从服务器上的relay-log.info记录的是 [root@centos7x ~]$ls /var/lib/mysql/ aria_log.00000001  ibdata1      mariadb-relay-bin.000004  master.info  performance_schema  wangdb aria_log_control   ib_logfile0  mariadb-relay-bin.000005  mysql        relay-log.info      wangdb2 hellodb            ib_logfile1  mariadb-relay-bin.index   mysql.sock   test                wangdb3 [root@centos7x ~]$ [root@centos7x ~]$cat /var/lib/mysql/relay-log.info  ./mariadb-relay-bin.000005 709 mariadb-bin.000002 510 8 [root@centos7x ~]$cat /var/lib/mysql/master.info  18 mariadb-bin.000002 510 192.168.27.7 repluser centos 3306 60 0 0 1800.000 0 主服务器; MariaDB [(none)]> show master logs; +--------------------+-----------+ | Log_name           | File_size | +--------------------+-----------+ | mariadb-bin.000001 |      8217 | | mariadb-bin.000002 |       510 | +--------------------+-----------+ 2 rows in set (0.00 sec)

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