Mysql的雙主架構
雙主模型架構：兩個節點都有二進制日誌和中繼日誌，都要啓用dump線程，io線程，sql線程。
io線程：負責從其他節點請求二進制日誌事件。
dump線程：從本地的二進制日誌讀取事件。
sql線程：從中繼日誌中讀取事件保存在本地數據庫中，並寫入二進制日誌。
配置實現雙主模型：
1）雙方節點具有複製權限的用戶
2）雙方節點都得啓用中繼日誌和需要配置二進制日誌
3）爲保證具有自動增長功能的字段能正確生成id，需要配置兩個節點分別使用偶數或奇數。
本次實驗使用兩個節點分別node1:192.168.1.117，node2:192.168.1.119。在上面兩個節點最好乾淨的數據庫，先做下初始化。之後就可以配置mysql的雙主模型了。
[root@www mydata]# ls
binlogs data relaylogs //此三個目錄文件在配置中都會使用到。
[root@www mydata]# ll //還需要屬主屬組爲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]#
在兩個node節點上的配置文件處分別編輯如下：
在node1上
[root@www mysql]# vim /etc/mysql/my.cnf
# binary logging is required for replication
log-bin=/mydata/binlogs/mysql-master1-bin //二進制日誌存放位置。
relay-log=/mydata/relaylogs/mysql-relay-log //中繼日誌存放位置。
# 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節點上。
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
分別啓動數據庫
[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上創建庫。
MariaDB [(none)]> CREATE DATABASE double_master;
Query OK, 1 row affected (0.00 sec)
在node1上查看所有數據庫。
MariaDB [(none)]> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| information_schema |
| double_master |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.05 sec)
在node1上創建表。
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; //查看錶double_tb1數據。
+----+-----------+--------+
| id | name | gender |
+----+-----------+--------+
| 1 | Wu Zetian | f |
| 3 | Li Shimin | m |
+----+-----------+--------+
2 rows in set (0.06 sec)
在node2節點上查看。
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; //查看結果和node1上一樣。
+----+-----------+--------+
| id | name | gender |
+----+-----------+--------+
| 1 | Wu Zetian | f |
| 3 | Li Shimin | m |
+----+-----------+--------+
2 rows in set (0.07 sec)