MySQL双Master配置_MySQL
主机环境说明。
master1: 10.8.1.11
master2: 10.8.1.12
版本信息:
[root@m1 ~]# mysql -V
mysql Ver 14.14 Distrib 5.6.27, for Linux (x86_64) using EditLine wrapper
1、主库开启bin-log功能,配置server-id
修改my.cf配置文件,开启bin-log功能,配置server-id。
[root@m1 ~]# more /etc/my.cnf # For advice on how to change settings please see # http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html [mysqld] server-id = 1 datadir = /var/lib/mysql log_bin = /var/lib/mysql/bin-log socket = /var/lib/mysql/mysql.sock slave_net_timeout = 60 log-slave-updates slave-skip-errors=all skip-name-resolve sync_binlog=1 auto_increment_increment=2 auto_increment_offset=1 sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES #salve-net-timeout默认是3600秒,缩短时间是为了防止双YES的假象 #(事实上我已遇到,参考地址:http://www.cnblogs.com/billyxp/p/3470376.html) 如果要指定同步或不同步哪些库,可使用如下参数 #binlog-do-db=osyunweidb #需要同步的数据库名,如果有多个数据库,可重复此参数,每个数据库一行 #binlog-ignore-db=mysql #不同步mysql系统数据库
至于这些参数的说明具体看手册。
红色的部分非常重要,如果一个MASTER 挂掉的话,另外一个马上接管。
紫红色的部分指的是服务器频繁的刷新日志。这个保证了在其中一台挂掉的话,日志刷新到另外一台。从而保证了数据的同步
2、确认bin-log与server-id是否开启:
查看命令 show variables like 'log_bin'; show variables like 'server_id';
mysql> show variables like 'log_bin'; +---------------+-------+ |Variable_name | Value | +---------------+-------+ |log_bin | ON | +---------------+-------+ 1 rowin set (0.00 sec) mysql>show variables like 'server_id'; +---------------+-------+ |Variable_name | Value | +---------------+-------+ |server_id | 1 | +---------------+-------+ 1 rowin set (0.00 sec)
3、创建复制授权用户
mysql> grant replication slave on *.* to replication@'%'identified by '123456'; #授权该用户对所有表都能进行复制
mysql>flush privileges; #刷新权限
4、锁表,记录log-bin文件名和位置
mysql>flush tables with read lock; #锁定所有表,此时数据库不能写入数据 QueryOK, 0 rows affected (0.05 sec) mysql>show master status; #查看最新bin-log文件及位置 +------------------------+------------+-------------------+-------------------------+ |File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +------------------------+------------+-------------------+-------------------------+ |mysql-bin.000001 | 26314 | | | +------------------------+------------+-------------------+-------------------------+ 1row in set (0.00 sec)
5、锁表状态全备mysql数据
由于退出当前mysql登陆窗口,锁表功能就失效,需克隆一个会话进行全备。
#mysqldump-uroot -p -A -B > /tmp/mysql_bak_2015_11_17.sql
看下备份数据大小,确认备份成功。
[root@m1 ~]# ls -l mysql_bak_2015_11_17.sql
-rw-r--r--. 1 root root 645327 Nov 18 06:27 mysql_bak_2015_11_17.sql
[root@m1 ~]#
6、解除锁表
mysql>unlock tables;
或直接quit退出即可。
7、从库开启bin-log功能,配置server-id
从库开启bin-log功能后,待会在主上在配置同步,互为主从就完成了。
[root@m2 ~]# vi /etc/my.cnf # For advice on how to change settings please see # http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html [mysqld] server-id = 2 datadir = /var/lib/mysql log_bin = /var/lib/mysql/mysql-bin socket = /var/lib/mysql/mysql.sock slave_net_timeout = 60 log-slave-updates slave-skip-errors=all skip-name-resolve sync_binlog=1 auto_increment_increment=2 auto_increment_offset=2 sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES #salve-net-timeout默认是3600秒,缩短时间是为了防止双YES的假象
#
至于这些参数的说明具体看手册。
红色的部分非常重要,如果一个MASTER 挂掉的话,另外一个马上接管。
紫红色的部分指的是服务器频繁的刷新日志。这个保证了在其中一台挂掉的话,日志刷新到另外一台。从而保证了数据的同步
#/etc/init.d/mysql restart
8、确认从库bin-log与server-id是否开启
查看命令 show variables like 'log_bin'; show variables like 'server_id';
mysql>show variables like 'log_bin'; +---------------+-------+ |Variable_name | Value | +---------------+-------+ |log_bin | ON | +---------------+-------+ 1row in set (0.00 sec) mysql>show variables like 'server_id'; +---------------+-------+ |Variable_name | Value | +---------------+-------+ |server_id | 2 | +---------------+-------+ 1row in set (0.00 sec)
9、从库导入主库的全备数据
登陆mysql导入数据
mysql>source /root/mysql_bak_2015_11_17.sql
10、记录从库bin-log信息
因为在从库导入全备数据时,此时主库与从库的内容是一致的,但是bin-log位置不一定一致。
mysql>show master status; #查看最新bin-log文件及位置 +------------------------+------------+-------------------+-------------------------+ |File |Position | Binlog_Do_DB | Binlog_Ignore_DB | +------------------------+------------+-------------------+-------------------------+ |mysql-bin.000003 | 2328055 | | | +------------------------+------------+-------------------+-------------------------+ 1row in set (0.00 sec)
11、从库设置同步主库
此处binlog文件与位置状态,是主库在步骤4锁表时show master status查看的位置状态。
CHANGE MASTER TO MASTER_HOST='10.8.1.11', MASTER_PORT=3306, MASTER_USER='replication', MASTER_PASSWORD='123456', MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=26314;
12、开启从库同步并确认同步是否成功
使用start slave开启同步功能,使用show slave status\G查看同步是否成功
mysql>start slave; QueryOK, 0 rows affected (0.00 sec) mysql>show slave status\G #\G不按表格输出 ***************************1. row *************************** Slave_IO_State: Waiting formaster to send event Master_Host: 10.0.0.2 Master_User: replication Master_Port: 8306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 136270 Relay_Log_File:mysqld-relay-bin.000002 Relay_Log_Pos: 72697 Relay_Master_Log_File: mysql-bin.000001 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: 98758 Relay_Log_Space: 110366 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: 622 #查看主从同步延迟,延迟大则可能需要优化 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 1row in set (0.00 sec)
#sql线程与IO线程都是YES,slave配置成功。
13、主库设置同步从库
由于从库是全备导入,原先在主库上配置的复制帐户也同样导入,所以这里不用在从库上新授权复制用户。
从库上的binlog文件与位置状态,是从库在刚导入时show master status查看到的位置状态。
CHANGEMASTER TO MASTER_HOST='10.8.1.12', MASTER_PORT=3306, MASTER_USER='replication', MASTER_PASSWORD='123456', MASTER_LOG_FILE='mysql-bin.000003', MASTER_LOG_POS=2328055; #修改相应信息,直接把这些配置在mysql中粘贴即可。
14、开启同步并确认同步是否成功
使用start slave开启同步功能,使用show slave status\G查看同步是否成功
mysql>start slave; QueryOK, 0 rows affected (0.00 sec) mysql>show slave status\G ***************************1. row *************************** Slave_IO_State: Waiting formaster to send event Master_Host: 172.16.0.2 Master_User: replication Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000007 Read_Master_Log_Pos: 107 Relay_Log_File:mysqld-relay-bin.000006 Relay_Log_Pos: 253 Relay_Master_Log_File: mysql-bin.000007 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: 107 Relay_Log_Space: 556 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: 2 1row in set (0.00 sec)
#IO线程与sql线程都是正常。
15、互为主从测试
在两台mysql各创建一个库,看两边是否都能进行同步。
分别在主库上执行 create database test01;
从库上执行create database test02;
看两台数据库上执行show databases;,看是否都有test01表和test02表。
我的经过测试,双主测试成功。

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