mysql主从同步的实现

mysql主从同步

master节点

配置文件：vim /etc/my.cnf

• 主从同步的关键配置选项：
• server-id=77 master的server-id和slave的server-id一定不能相同
• log-bin 二进制日志

[mysqld]
socket=/var/lib/mysql/mysql.sock
user=mysql
symbolic-links=0
datadir=/data/mysql
innodb_file_per_table=1
skip_name_resolve=on
server-id=77
log-bin

master节点创建一个复制用户，并授权：

• 查看master二进制日志的位置：mysql> show master status;

mysql> grant replication slave on *.*  to repluser@'192.168.38.%' identified by 'centos';

slave节点

配置文件：vim /etc/my.cnf

• 关键配置：
• read-only
• server-id=87 不能和master节点一样

[mysqld]
socket=/var/lib/mysql/mysql.sock
user=mysql
symbolic-links=0
datadir=/data/mysql
innodb_file_per_table=1
skip_name_resolve=on
read-only
server-id=87

与master建立关联：

mysql> CHANGE MASTER TO   MASTER_HOST='192.168.38.57',   MASTER_USER='repluser',   MASTER_PASSWORD='centos',   MASTER_PORT=3306,   MASTER_LOG_FILE='centos7-57-bin.000001',   MASTER_LOG_POS=333,   MASTER_CONNECT_RETRY=10;

注意：

• MASTER_HOST='192.168.38.57
• MASTER_LOG_FILE=‘centos7-57-bin.000001’ 主节点的二进制日志文件名（尤其是默认的时候）
• MASTER_LOG_POS=333 二进制日志的位置

mysql> START SLAVE;  

验证主从同步

mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.10.101
Master_User: tom
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master-log.000006
Read_Master_Log_Pos: 120
Relay_Log_File: mysql.000002
Relay_Log_Pos: 284
Relay_Master_Log_File: master-log.000006
Slave_IO_Running: Yes #这两个线程状态必须为YES才表示同步是成功的
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: 120
Relay_Log_Space: 447
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 #表示从Master收到的bin-log到当前的同步位置差多少秒，不是严格意义的主从差多少秒，因为Master的bin-log更新以后可能还没有同步到Slave
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: 10
Master_UUID: 003e966d-de3e-11e6-bc0f-000c2944baf2
Master_Info_File: /data/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)

清除主从同步信息

• mysql>stop slave;
• mysql>reset slave all;
• mysql> show slave status\G