MYsql主主循环同步
MYSQL MASTERMASTER的主主循环同步
刚刚抽空做了一下MYSQL 的主主同步。
把步骤写下来,至于会出现的什么问题,以后随时更新。这里我同步的数据库是TEST
1、环境描述。
  主机:192.168.0.231A
  主机:192.168.0.232B
  MYSQL 版本为5.1.21
2、授权用户。
A
mysql> grant replication slave,file on *.* to 'repl1'@'192.168.0.232' identified
 by '123456';
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
B
mysql> grant replication slave,file on *.* to 'repl2'@'192.168.0.231' identified
 by '123456';
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
然后都停止MYSQL 服务器。

3、配置文件。
在两个机器上的myf里面都开启二进制日志
A
user = mysql
log-bin=mysql-bin
server-id      = 1
binlog-do-db=test
binlog-ignore-db=mysql
replicate-do-db=test
replicate-ignore-db=mysql
log-slave-updates
slave-skip-errors=all
sync_binlog=1
auto_increment_increment=2
auto_increment_offset=1

B
user = mysql
log-bin=mysql-bin
server-id      = 2
binlog-do-db=test
binlog-ignore-db=mysql
replicate-do-db=test
replicate-ignore-db=mysql
log-slave-updates
slave-skip-errors=all
sync_binlog=1
auto_increment_increment=2
auto_increment_offset=2
至于这些参数的说明具体看手册。
红的部分非常重要,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
4、重新启动MYSQL服务器。
AB上执行相同的步骤
[root@localhost ~]# /usr/local/mysql/bin/mysqld_safe &
[1] 4264
[root@localhost ~]# 071213 14:53:20 mysqld_safe Logging to '/usr/local/mysql/data/'.
/usr/local/mysql/bin/mysqld_safe: line 366: [: -eq: unary operator expected
071213 14:53:20 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data

5、进入MYSQLSHELL
A
mysql> flush tables with read lock\G
Query OK, 0 rows affected (0.00 sec)

天在下雨我在想你mysql> show master status\G
*************************** 1. row ***************************
            File: mysql-bin.000007
        Position: 528
    Binlog_Do_DB: test
Binlog_Ignore_DB: mysql
1 row in set (0.00 sec)

B
mysql> flush tables with read lock;
Query OK, 0 rows affected (0.00 sec)

mysql> show master status\G
*************************** 1. row ***************************
            File: mysql-bin.000004
        Position: 595
    Binlog_Do_DB: test
Binlog_Ignore_DB: mysql
1 row in set (0.00 sec)
然后备份自己的数据,保持两个机器的数据一致。
方法很多。完了后看下一步。
6、在各自机器上执行CHANGE MASTER TO命令。
A
mysql> change master to
    -> master_host='192.168.0.232',
    -> master_user='repl2',
    -> master_password='123456',
    -> master_log_file='mysql-bin.000004',
    -> master_log_pos=595;
Query OK, 0 rows affected (0.01 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)


B
mysql> change master to
    -> master_host='192.168.0.231',
    -> master_user='repl1',
    -> master_password='123456',
    -> master_log_file='mysql-bin.000007',
    -> master_log_pos=528;
Query OK, 0 rows affected (0.01 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

7、查看各自机器上的IO进程和 SLAVE进程是否都开启。
A

mysql> show processlist\G
*************************** 1. row ***************************
    Id: 2
  User: repl
  Host: 192.168.0.232:54475
    db: NULL
Command: Binlog Dump
  Time: 1590
  State: Has sent all binlog to slave; waiting for binlog to be updated
  Info: NULL
*************************** 2. row ***************************
    Id: 3
  User: system user
  Host:
    db: NULL
Command: Connect
  Time: 1350
  State: Waiting for master to send event
  Info: NULL
*************************** 3. row ***************************
    Id: 4
  User: system user
  Host:
    db: NULL
大乐透开奖结果中奖规则Command: Connect
  Time: 1149
  State: Has read all relay log; waiting for the slave I/O thread to update it
  Info: NULL
*************************** 4. row ***************************
    Id: 5
  User: root
  Host: localhost
    db: test
Command: Query
  Time: 0
  State: NULL
  Info: show processlist
4 rows in set (0.00 sec)

B

mysql> show processlist\G
*************************** 1. row ***************************
    Id: 1
  User: system user
  Host:
    db: NULL
Command: Connect
  Time: 2130
  State: Waiting for master to send event
  Info: NULL
*************************** 2. row ***************************
    Id: 2
  User: system user
  Host:
    db: NULL
刘涛古装电视剧Command: Connect
  Time: 1223
  State: Has read all relay log; waiting for the slave I/O thread to update it
  Info: NULL
*************************** 3. row ***************************
    Id: 4
  User: root
  Host: localhost
    db: test
Command: Query
  Time: 0
  State: NULL
  Info: show processlist
*************************** 4. row ***************************
    Id: 5
  User: repl2
  Host: 192.168.0.231:50718
    db: NULL
Command: Binlog Dump
  Time: 1398
  State: Has sent all binlog to slave; waiting for binlog to be updated
  Info: NULL
4 rows in set (0.00 sec)

如果红部分没有出现,检查DATA目录下的错误文件。

8、释放掉各自的锁,然后进行插数据测试。
mysql> unlock tables;
Query OK, 0 rows affected (0.00 sec)

插入之前两个机器表的对比:
A

mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| t11_innodb    |
| t22            |
+----------------+
B

mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| t11_innodb    |
| t22            |
+----------------+女孩子做什么职业好
A机器上进行插入
A
mysql> create table t11_replicas
    -> (id int not null auto_increment primary key,
    -> str varchar(255) not null) engine myisam;
Query OK, 0 rows affected (0.01 sec)

mysql> insert into t11_replicas(str) values
    -> ('This is a master to master test table');
Query OK, 1 row affected (0.01 sec)

mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| t11_innodb    |
| t11_replicas  |
| t22            |
+----------------+
3 rows in set (0.00 sec)

mysql> select * from t11_replicas;
+----+---------------------------------------+
| id | str                                  |
+----+---------------------------------------+
|  1 | This is a master to master test table |
+----+---------------------------------------+
1 row in set (0.00 sec)


现在来看B机器:

mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| t11_innodb    |
| t11_replicas  |
| t22            |
+----------------+
3 rows in set (0.00 sec)

mysql> select * from t11_replicas;
+----+---------------------------------------+
| id | str                                  |
+----+---------------------------------------+
|  1 | This is a master to master test table |
+----+---------------------------------------+
1 row in set (0.00 sec)

现在反过来从B机器上插入数据:
B

mysql> insert into t11_replicas(str) values('This is a test 2');
Query OK, 1 row affected (0.00 sec)

mysql> select * from t11_replicas;
小米开发版+----+---------------------------------------+
| id | str                                  |
+----+---------------------------------------+
|  1 | This is a master to master test table |
|  2 | This is a test 2                      |
+----+---------------------------------------+
2 rows in set (0.00 sec)
我们来看A
A
mysql> select * from t11_replicas;
+----+---------------------------------------+
| id | str                                  |
+----+---------------------------------------+
|  1 | This is a master to master test table |
|  2 | This is a test 2                      |
+----+---------------------------------------+
2 rows in set (0.00 sec)

好了。现在两个表互相为MASTER
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