mysql 主主
环境说明：
系统 主机名 IP mysql版本
Cenots 5.8 mysql-m1 192.168.3.173 5.0.95
Cenots 5.8 mysql-m2 192.168.3.178 5.0.95
1.首先安装mysql，为了方便，使用yum安装。（两台都要装）
[root@localhost ~]# yum install mysql mysql-server mysql-devel
2.启动mysql
2.1:先初始化mysql表 ------两台都要做
[root@mysql-m2 ~]# mysql_install_db
[root@mysql-m2 ~]# /etc/init.d/mysqld start
Starting mysqld: [ OK ]
3.创建同步的数据库和同步的用户 //两台都要做
3.1：创建数据库
mysql> create database test_db;
Query OK, 1 row affected (0.11 sec)
mysql> flush privileges; // 刷新系统权限表
Query OK, 0 rows affected (0.01 sec)
3.2：创建同步用的用户
mysql> insert into mysql.user(Host,User,Password) values('localhost','rsync',password='123456');
Query OK, 1 row affected, 3 warnings (0.02 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
3.3：授权用户能进行远程登陆
mysql> grant all privileges on test_db.* to 'rsync'@'%' identified by '123456';
Query OK, 0 rows affected (0.03 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
3.4：授权能打开复制进程
mysql> grant replication slave on *.* to 'rsync'@'%' identified by '123456';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
4.修改my.cnf文件 //两台都要做
在mysql上修改my.cnf文件
[root@mysql-m1 ~]# vim /etc/my.cnf
在mysqld中配置/添加：
binlog-do-db=test_db
binlog-ignore-db=mysql
replicate-do-db=test_db
replicate-ignore-db=mysql,information_schema,test
log-slave-updates
sync_binlog=1
auto_increment_offset=1
auto_increment_increment=2
slave-skip-errors=all
这里注意配置server-id的值，不同即可。
配置完成后重启mysql
/etc/init.d/mysqld restart
5.锁表 //两台都要做
mysql> flush tables with read lock;
Query OK, 0 rows affected (0.00 sec)
6.查看这两台机器作为主服务器的状态
//mysql-m1:
mysql> show master status\G;
*************************** 1. row ***************************
File: mysql-bin.000009
Position: 98
Binlog_Do_DB: test_db
Binlog_Ignore_DB: mysql
1 row in set (0.00 sec)
//mysql-m2:
mysql> show master status\G;
*************************** 1. row ***************************
File: mysql-bin.000002
Position: 98
Binlog_Do_DB: test_db
Binlog_Ignore_DB: mysql
1 row in set (0.00 sec)
7.使用change master语句指定同步位置
//mysql-m1:
mysql> change master to master_host='192.168.3.178',
-> master_user='rsync',
-> master_password='123456',
-> master_log_file='mysql-bin.000002',
-> master_log_pos=98;
Query OK, 0 rows affected (0.03 sec)
//mysql-m2:
mysql> change master to master_host='192.168.3.173',
-> master_user='rsync',
-> master_password='123456',
-> master_log_file='mysql-bin.000009',
-> master_log_pos=98
-> ;
Query OK, 0 rows affected (0.08 sec)
8.打开表
//mysql-m1:
mysql> unlock tables;
Query OK, 0 rows affected (0.00 sec)
//mysql-m2:
mysql> unlock tables;
Query OK, 0 rows affected (0.00 sec)
9.分别启动从服务器线程
//mysql-m1:
mysql> start slave;
Query OK, 0 rows affected (0.01 sec)
//mysql-m2:
mysql> start slave;
Query OK, 0 rows affected (0.01 sec)
10.查看从服务器状态：
//mysql-m1:
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.3.178
Master_User: rsync
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 98
Relay_Log_File: mysqld-relay-bin.000002
Relay_Log_Pos: 235
Relay_Master_Log_File: mysql-bin.000002
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: test_db
Replicate_Ignore_DB: mysql,information_schema,test
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: 98
Relay_Log_Space: 235
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
1 row in set (0.00 sec)
//mysql-m2:
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.3.173
Master_User: rsync
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000009
Read_Master_Log_Pos: 98
Relay_Log_File: mysqld-relay-bin.000002
Relay_Log_Pos: 235
Relay_Master_Log_File: mysql-bin.000009
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: test_db
Replicate_Ignore_DB: mysql,information_schema,test
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: 98
Relay_Log_Space: 235
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
1 row in set (0.00 sec)
11.测试。
//mysql-m1:
创建表，并插入数据
mysql> use test_db;
Database changed
mysql> create table test_db(id int(3),name char(10),age char(8));
Query OK, 0 rows affected (0.04 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
mysql> insert into test_db values(001,'baofeng','31');
Query OK, 1 row affected (0.02 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
mysql> select * from test_db;
+------+---------+------+
| id | name | age |
+------+---------+------+
| 1 | baofeng | 31 |
+------+---------+------+
1 row in set (0.00 sec)
//mysql-m2查看:
mysql> use test_db;
Database changed
mysql> show tables;
+-------------------+
| Tables_in_test_db |
+-------------------+
| test_db |
+-------------------+
1 row in set (0.01 sec)
mysql> select * from test_db;
+------+---------+------+
| id | name | age |
+------+---------+------+
| 1 | baofeng | 31 |
+------+---------+------+
1 row in set (0.00 sec)
大家知道，mysql主从，从库进行操作是无法同步主库的。
现在在mysql-m2上进行删除操作:
mysql> delete from test_db;
Query OK, 1 row affected (0.00 sec)
mysql> show tables;
+-------------------+
| Tables_in_test_db |
+-------------------+
| test_db |
+-------------------+
1 row in set (0.00 sec)
//mysql-m1查看
mysql> select * from test_db;
Empty set (0.00 sec)
Import:这里有个很重要的点，如果mysql要做主主同步的库不为空，最好先停库导数据，然后锁表防止数据写入，在另外一个库上将数据导入
成功之后，然后解锁表，再进行slave复制同步操作。
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