mysql 主主+主从笔记

环境

Ubuntu 14.04.4 LTS *3 分别是master1(192.168.42.28), master2(192.168.42.29), slave1(192.168.42.33)测试下只有master1有从

配置

vim /etc/mysql/my.cnf
#必要的配置
[mysqld]
...
bind-address            = 0.0.0.0
#3台主机的id分别是 1,2,3
server-id               = 1

binlog-do-db=test #需要记录二进制日志的数据库.如果有多个数据库可用逗号分隔,或者使用多个binlog-do-db选项
#需要同步的数据库
replicate-do-db=test #需要进行同步的数据库.如果有多个数据库可用逗号分隔,或者使用多个binlog-do-db选项

log_bin                 = /var/log/mysql/mysql-bin.log
#这很主要，不然没办法做主从
log-slave-updates
...

同步数据

我使用的是 innobackupex 同步，也可以mysqldump。

master1 master2 slave1都需要同步

master1 配置

#给master2权限
grant replication slave,file on *.* to 'slave'@'192.168.42.29' identified by '123123';
#给slave1权限
grant replication slave,file on *.* to 'slave'@'192.168.42.33' identified by '123123';

stop slave;
show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000007 |      723 | test         |                  |
+------------------+----------+--------------+------------------+

change master to master_host='192.168.42.29',master_user='slave',master_password='123123',master_log_file='mysql-bin.000008', master_log_pos=267,master_connect_retry=10; #mysql-bin.000008和267是master2的状态
#参数
#master_connect_retry默认60秒，重连的时间，如果断开就60秒从试,直到链接上
#master_log_pos，master_log_file为复制主机的show master status的值

#启动复制
start slave;
#查看状态
show slave status\G;

*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.42.29
Master_User: slave
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000008
Read_Master_Log_Pos: 267
Relay_Log_File: mysqld-relay-bin.000002
Relay_Log_Pos: 253
Relay_Master_Log_File: mysql-bin.000008
Slave_IO_Running: Yes #显示YES配置成功
Slave_SQL_Running: Yes
Replicate_Do_DB: test
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: 267
Relay_Log_Space: 410
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
1 row in set (0.00 sec)

master2 配置

#给master2权限
grant replication slave,file on *.* to 'slave'@'192.168.42.28' identified by '123123';

stop slave;
show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000008 |      267 | test         |                  |
+------------------+----------+--------------+------------------+

change master to master_host='192.168.42.28',master_user='slave',master_password='123123',master_log_file='mysql-bin.000007', master_log_pos=723;
#启动复制
start slave;
#查看状态
show slave status\G;

*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.42.28
Master_User: slave
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000007
Read_Master_Log_Pos: 723
Relay_Log_File: mysqld-relay-bin.000002
Relay_Log_Pos: 253
Relay_Master_Log_File: mysql-bin.000007
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: test
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: 723
Relay_Log_Space: 410
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

slave1 配置

stop slave;

change master to master_host='192.168.42.28',master_user='slave',master_password='123123',master_log_file='mysql-bin.000007', master_log_pos=723;

show slave status\G

*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.42.28
Master_User: slave
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000007
Read_Master_Log_Pos: 883
Relay_Log_File: mysqld-relay-bin.000002
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: 883
Relay_Log_Space: 410
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

测试

分别在master1,master2 插入数据，在查看3个主机的数据

未解决的问题

当前状态最多能有2台是主