一、主从同步：（A--->B）
master:192.168.71.128
slave:192.168.71.138
1、Master配置:
vi /etc/my.cnf
server-id = 1
log-bin=mysql-bin 启用二进制日志
binlog-ignore-db = mysql 不同步mysql库
授权从数据库192.168.71.138使用账号rsync密码bobo365同步主数据库所有数据
mysql> grant replication slave on *.* to rsync@'192.168.71.138' identified by 'bobo365';
Query OK, 0 rows affected (0.01 sec)
刷新权限
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
设置表为只读状态
mysql> flush tables with read lock;
Query OK, 0 rows affected (0.00 sec)
记录file和position值，slave端要用到该数值。
mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000025 | 541 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
解锁数据库只读。
mysql> unlock tables;
Query OK, 0 rows affected (0.00 sec)
2、Slave配置：
vim /etc/my.cnf
server-id = 2
mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)
mysql> change master to master_host='192.168.71.128',master_user='rsync',master_
password='bobo365',master_log_file='mysql-bin.000025',master_log_pos=541;
Query OK, 0 rows affected (0.01 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.71.128
Master_User: rsync
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000025
Read_Master_Log_Pos: 886
Relay_Log_File: localhost-relay-bin.000002
Relay_Log_Pos: 598
Relay_Master_Log_File: mysql-bin.000025
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: 886
Relay_Log_Space: 758
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
1 row in set (0.00 sec)
3、测试：
master：
mysql> create database m2s;
Query OK, 1 row affected (0.00 sec)
mysql> use m2s;
Database changed
mysql> create table m2s_tb(id int(2),name char(10));
Query OK, 0 rows affected (0.01 sec)
mysql> insert into m2s_tb values(001,'todu');
Query OK, 1 row affected (0.00 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| bb |
| db_nagiosql_v3 |
| m2s |
| mysql |
| performance_schema |
| testcopy |
+--------------------+
7 rows in set (0.00 sec)
Slave：
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| cactidb |
| collabtive |
| db_nagiosql_v3 |
| m2s |
| my_wiki |
| mysql |
| performance_schema |
| test |
| testcopy |
+--------------------+
10 rows in set (0.00 sec)
mysql> use m2s;
Database changed
mysql> select * from m2s_tb;
+------+------+
| id | name |
+------+------+
| 1 | todu |
+------+------+
1 row in set (0.00 sec)
二、双向同步：（A<--->B）
使用主主前提：
A、表的主键自增
B、程序写库指定ID
双主互为主从：
解决主键自增长变量冲突：
Master1：
auto_increment_increment = 2 #自增ID的间隔，如 1 3 5间隔为2.
auto_increment_offset = 1
Master2：
auto_increment_increment = 2 #自增ID的间隔，如 2 4 6间隔为2.
auto_increment_offset = 2
存在ID不连续问题：
----> 1 3 5 6 8 10 11 13 15
互为主从参数：
log-bin = /data/3307/mysql-bin
log-slave-updates #开启从库binlog日志
三、二次学习内容补充（对比学习）
环境：
3306 主
3307 从
主库操作：
开启binlog：log-bin = /data/3306/mysql-bin
更改server id：server-id = 1
添加复制用户：
grant replication slave on *.* to rep@'192.168.1.%' identified by 'bobo365';
加读锁：
flush table with read lock;
show master status;
mysql-bin.000011 | 43275
show master logs;
窗口不关，重新开窗口dump数据：
mysqldump -S /data/3306/mysql.sock -uroot -pbobo365 -A -B -E --master-data=2 > /home/rep.sql
或者直接锁表：
mysqldump -S /data/3306/mysql.sock -uroot -pbobo365 -A -B -E -X --master-data=2 > /home/rep.sql
或者--master-data=1
则从库不用如下参数：
MASTER_LOG_FILE='mysql-bin.000011',
MASTER_LOG_POS=43275;
解锁：
unlock tables;
从库：
#log-bin = /data/3307/mysql-bin
server-id = 3
把主库备份文件rep.sql灌入主库：
source /home/rep.sql
登录到从库执行：
CHANGE MASTER TO
MASTER_HOST='192.168.1.61',
MASTER_PORT=3306,
MASTER_USER='rep',
MASTER_PASSWORD='bobo365',
MASTER_LOG_FILE='mysql-bin.000011',
MASTER_LOG_POS=43275;
查看mster info文件：
[root@zhong-61 data]# more master.info
23
mysql-bin.000011
43275
192.168.1.61
rep
bobo365
3306
开启开关：
start slave;
检查：
show slave status\G
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
附录：
对比第一次，第二次增加遗漏关键步骤：
在主库做全备，在从库做全备导入。
