Mysql的双主架构
Mysql的双主架构
双主模型架构：两个节点都有二进制日志和中继日志，都要启用dump线程，io线程，sql线程。
io线程：负责从其他节点请求二进制日志事件。
dump线程：从本地的二进制日志读取事件。
sql线程：从中继日志中读取事件保存在本地数据库中，并写入二进制日志。
配置实现双主模型：
1）双方节点具有复制权限的用户
2）双方节点都得启用中继日志和需要配置二进制日志
3）为保证具有自动增长功能的字段能正确生成id，需要配置两个节点分别使用偶数或奇数。
本次实验使用两个节点分别node1:192.168.1.117，node2:192.168.1.119。在上面两个节点最好干净的数据库，先做下初始化。之后就可以配置mysql的双主模型了。
[root@www mydata]# ls
binlogs data relaylogs //此三个目录文件在配置中都会使用到。
[root@www mydata]# ll //还需要属主属组为mysql。
total 12
drwxr-xr-x. 2 mysql mysql 4096 Feb 15 13:25 binlogs
drwxr-xr-x. 2 mysql mysql 4096 Feb 15 13:24 data
drwxr-xr-x. 2 mysql mysql 4096 Feb 15 13:26 relaylogs
[root@www mydata]#
在两个node节点上的配置文件处分别编辑如下：
在node1上
[root@www mysql]# vim /etc/mysql/my.cnf
# binary logging is required for replication
log-bin=/mydata/binlogs/mysql-master1-bin //二进制日志存放位置。
relay-log=/mydata/relaylogs/mysql-relay-log //中继日志存放位置。
# binary logging format - mixed recommended
binlog_format=mixed
# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id = 1
auto-increment-offset =1
auto-increment-increment =2 //id每次增加2。
在node2节点上。
log-bin=/mydata/binlogs/mysql-master2-bin
relay-log=/mydata/relaylogs/mysql-relay-log
# binary logging format - mixed recommended
binlog_format=mixed
# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id = 11
auto-increment-offset =2
auto-increment-increment =2
分别启动数据库
[root@bogon data]# service mysqld start
Starting MySQL....... [ OK ]
在node1和node2上
MariaDB [(none)]> GRANT REPLICATION SLAVE,REPLICATION CLIENT ON *.* TO reuser@'192.168.1.%'
IDENTIFIED BY 'repass';
Query OK, 0 rows affected (0.09 sec)
MariaDB [(none)]> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
在node1上
MariaDB [(none)]> SHOW MASTER STATUS;
+--------------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+--------------------------+----------+--------------+------------------+
| mysql-master1-bin.000001 | 501 | | |
+--------------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
MariaDB [(none)]>
在node2上
MariaDB [(none)]> SHOW MASTER STATUS;
+--------------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+--------------------------+----------+--------------+------------------+
| mysql-master2-bin.000003 | 501 | | |
+--------------------------+----------+--------------+------------------+
1 row in set (0.81 sec)
MariaDB [(none)]>
在node2上
MariaDB [(none)]> CHANGE MASTER TO
MASTER_HOST='192.168.1.117',MASTER_USER='reuser',MASTER_PASSWORD='repass',MASTER_LOG_FILE='mysql-master1-bin.000001',MASTER_LOG_POS=501;
Query OK, 0 rows affected (0.06 sec)
在node1上
MariaDB [(none)]> CHANGE MASTER TO
MASTER_HOST='192.168.1.119',MASTER_USER='reuser',MASTER_PASSWORD='repass',MASTER_LOG_FILE='mysql-master2-bin.000003',MASTER_LOG_POS=501;
Query OK, 0 rows affected (0.16 sec)
MariaDB [(none)]> START SLAVE;
Query OK, 0 rows affected (0.08 sec)
MariaDB [(none)]> SHOW SLAVE STATUS\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.119
Master_User: reuser
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-master2-bin.000003
Read_Master_Log_Pos: 501
Relay_Log_File: mysql-relay-log.000002
Relay_Log_Pos: 537
Relay_Master_Log_File: mysql-master2-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
在node2上
MariaDB [(none)]> CHANGE MASTER TO
MASTER_HOST='192.168.1.117',MASTER_USER='reuser',MASTER_PASSWORD='repass',MASTER_LOG_FILE='mysql-master1-bin.000001',MASTER_LOG_POS=501;
Query OK, 0 rows affected (0.16 sec)
MariaDB [(none)]> START SLAVE;
Query OK, 0 rows affected (0.08 sec)
MariaDB [(none)]> SHOW SLAVE STATUS\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.117
Master_User: reuser
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-master1-bin.000001
Read_Master_Log_Pos: 501
Relay_Log_File: mysql-relay-log.000002
Relay_Log_Pos: 537
Relay_Master_Log_File: mysql-master1-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
在node2上创建库。
MariaDB [(none)]> CREATE DATABASE double_master;
Query OK, 1 row affected (0.00 sec)
在node1上查看所有数据库。
MariaDB [(none)]> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| information_schema |
| double_master |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.05 sec)
在node1上创建表。
MariaDB [(none)]> USE double_master;
Database changed
MariaDB [double_master]> CREATE TABLE double_tb1(id INT(11) AUTO_INCREMENT PRIMARY KEY,name CHAR(20),gender ENUM('m','f'));
Query OK, 0 rows affected (0.55 sec)
MariaDB [double_master]> INSERT INTO double_tb1 VALUES(NULL,'Wu Zetian','f'),(NULL,'Li Shimin','m');
Query OK, 2 rows affected (0.07 sec)
Records: 2 Duplicates: 0 Warnings: 0
MariaDB [double_master]> SELECT * FROM double_tb1; //查看表double_tb1数据。
+----+-----------+--------+
| id | name | gender |
+----+-----------+--------+
| 1 | Wu Zetian | f |
| 3 | Li Shimin | m |
+----+-----------+--------+
2 rows in set (0.06 sec)
在node2节点上查看。
MariaDB [(none)]> USE double_master;
Database changed
MariaDB [double_master]> SHOW TABLES;
+-------------------------+
| Tables_in_double_master |
+-------------------------+
| double_tb1 |
+-------------------------+
1 row in set (0.00 sec)
MariaDB [double_master]> SELECT * FROM double_tb1; //查看结果和node1上一样。
+----+-----------+--------+
| id | name | gender |
+----+-----------+--------+
| 1 | Wu Zetian | f |
| 3 | Li Shimin | m |
+----+-----------+--------+
2 rows in set (0.07 sec)