mysql主主复制

mysql主主配置和主从配置的不同点在于主从的master不监控slavebin-log的变化，导致slave有新数据不能更新到master
主主配置的关键参数：log-slave-updates,两台mysql都需添加

测试环境：
centos 6.5 x64
主1ip:192.168.0.1
主2ip:192.168.0.2

主主配置
主1
vim /etc/my.cnf
server-id=1bin-log=mysql-binbinlog-format=mixedlog-slave-updates
relay-log=mysql-relay

auto_increment_increment= 2
auto_increment_offset= 1

注：auto_increment_offset和auto_increment_increment这两个参数用于避免多master情况下，多个master同时存取字段类型为AUTO_INCREMENT的冲突

主2
server-id=2bin-log=mysql-binbinlog-format=mixedlog-slave-updatesrelay-log=mysql-relayauto_increment_increment= 2
auto_increment_offset= 1

修改配置后均重启mysql使配置生效分别在主1和主2上做主从一、给主1配置从在主1上1.授权登陆账号(两边要建立可复制的账号)grant replication client,replication slave on *.* to 'salve'@'192.168.0.*' identified by 'test123';2.show master status;mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000002 | 653 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
在主2上stop slave;reset slave;change master to master_host='192.168.0.1',master_user='slave',master_password='test123',master_log_file='mysql-bin.000002',master_log_pos=653;start slave;show salve status\G;
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
即成功一、给主2配置从
步骤通给主1配置从
测试：分别在主1和主2添加数据，看在另一台是否能查询在主1上mysql> select * from t;
+---+
| s |
+---+
| 2 |
+---+
1 row in set (0.00 sec)

mysql> insert into t values (3);
Query OK, 1 row affected (0.01 sec)

mysql> select * from t;
+---+
| s |
+---+
| 2 |
| 3 |
+---+
2 rows in set (0.00 sec)

mysql> select * from t;
+---+
| s |
+---+
| 2 |
| 3 |
| 4 |
+---+
3 rows in set (0.00 sec)
在主2上
mysql> use proxy_test;
Database changed
mysql> select * from t;
+---+
| s |
+---+
| 2 |
+---+
1 row in set (0.00 sec)

mysql> select * from t;
+---+
| s |
+---+
| 2 |
| 3 |
+---+
2 rows in set (0.00 sec)

mysql> insert into t values (4);
Query OK, 1 row affected (0.00 sec)

mysql> select * from t;
+---+
| s |
+---+
| 2 |
| 3 |
| 4 |
+---+
3 rows in set (0.00 sec)

主主配置到此测试成功