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MySQL雙Master配置的方法詳解

更新時間：2013年06月18日 10:52:43 作者：

本篇文章是對MySQL雙Master配置進行了詳細(xì)的分析介紹，需要的朋友參考下

剛剛抽空做了一下MYSQL 的主主同步。
把步驟寫下來，至于會出現(xiàn)的什么問題，以后隨時更新。這里我同步的數(shù)據(jù)庫是TEST
1、環(huán)境描述。
主機：192.168.0.231（A）
主機：192.168.0.232（B）
MYSQL 版本為5.1.21
2、授權(quán)用戶。
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 服務(wù)器。

3、配置文件。
在兩個機器上的my.cnf里面都開啟二進制日志。
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

skip-name-resolve

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

skip-name-resolve

sync_binlog=1
auto_increment_increment=2
auto_increment_offset=2
至于這些參數(shù)的說明具體看手冊。
紅色的部分非常重要，如果一個MASTER 掛掉的話，另外一個馬上接管。
紫紅色的部分指的是服務(wù)器頻繁的刷新日志。這個保證了在其中一臺掛掉的話，日志刷新到另外一臺。從而保證了數(shù)據(jù)的同步。
4、重新啟動MYSQL服務(wù)器。
在A和B上執(zhí)行相同的步驟
[root@localhost ~]# /usr/local/mysql/bin/mysqld_safe &
[1] 4264
[root@localhost ~]# 071213 14:53:20 mysqld_safe Logging to '/usr/local/mysql/data/localhost.localdomain.err'.
/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、進入MYSQL的SHELL。
A：
mysql> flush tables with read lock\G
Query OK, 0 rows affected (0.00 sec)

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)
然后備份自己的數(shù)據(jù)，保持兩個機器的數(shù)據(jù)一致。
方法很多。完了后看下一步。
6、在各自機器上執(zhí)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、查看各自機器上的IO進程和 SLAVE進程是否都開啟。
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
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
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)

如果紅色部分沒有出現(xiàn)，檢查DATA目錄下的錯誤文件。

8、釋放掉各自的鎖，然后進行插數(shù)據(jù)測試。
mysql> unlock tables;
Query OK, 0 rows affected (0.00 sec)

插入之前兩個機器表的對比：
A：

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

mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| t11_innodb     |
| t22            |
+----------------+
從A機器上進行插入
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)

現(xiàn)在來看B機器：

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)

現(xiàn)在反過來從B機器上插入數(shù)據(jù)：
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;
+----+---------------------------------------+
| id | str                                   |
+----+---------------------------------------+
| 1 | This is a master to master test table |
| 2 | This is a test 2                      |
+----+---------------------------------------+
2 rows in set (0.00 sec)
我們來看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?，F(xiàn)在兩個表互相為MASTER。

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