一、双主模型复制:两个节点互为主从,均可读写。
二、配置双主模型复制:
1、演示环境:
IP |
操作系统 |
数据库版本 |
安装方式 |
角色 |
192.168.1.145 |
CentOS 7.6 x86_64 |
MariaDB-10.3.15 |
yum |
master1 |
192.168.1.146 |
CentOS 7.6 x86_64 |
MariaDB-10.3.15 |
yum |
master2 |
2、两个节点的服务器时间同步
3、master1修改server.cnf配置文件:# vim /etc/my.cnf.d/server.cnf
[mysqld]
port=3306
socket=/var/lib/mysql/mysql.sock
datadir=/var/lib/mysql
log_error=/var/log/mariadb.log
lower_case_table_names=1
character_set_server=utf8mb4
collation_server=utf8mb4_general_ci
innodb_file_per_table=1
skip_name_resolve=1
slow_query_log=1
slow_query_log_file=mariadb-slow.log
log_bin=master1-bin
log_bin_index=master1-bin.index
binlog_format=mixed
relay_log=relay1-log
relay_log_index=relay1-log.index
server_id=1
sync_binlog=1
innodb_flush_log_at_trx_commit=1
备注:中继日志默认不存在,只有当复制启动时才会自动生成
4、master1创建具有复制权限的用户:
MariaDB [(none)]> grant replication slave,replication client on *.* to 'repluser'@'192.168.1.146' identified by '123456';
MariaDB [(none)]> flush privileges;
5、master1查看正在使用的二进制日志文件名称及事件位置:
MariaDB [(none)]> show master status;
6、master2修改server.cnf配置文件:# vim /etc/my.cnf.d/server.cnf
[mysqld]
port=3306
socket=/var/lib/mysql/mysql.sock
datadir=/var/lib/mysql
log_error=/var/log/mariadb.log
lower_case_table_names=1
character_set_server=utf8mb4
collation_server=utf8mb4_general_ci
innodb_file_per_table=1
skip_name_resolve=1
slow_query_log=1
slow_query_log_file=mariadb-slow.log
log_bin=master2-bin
log_bin_index=master2-bin.index
binlog_format=mixed
relay_log=relay2-log
relay_log_index=relay2-log.index
server_id=2
sync_binlog=1
innodb_flush_log_at_trx_commit=1
7、master2使用具有复制权限的用户连接至master1:
MariaDB [(none)]> change master to master_host='192.168.1.145',master_user='repluser',master_password='123456',master_port=3306,master_log_file='master1-bin.000001',master_log_pos=2035;
MariaDB [(none)]> show slave status\G
备注:
(1)Slave_IO_Running和Slave_SQL_Running的值,默认为No
(2)自动在数据目录/var/lib/mysql中创建relay2-log.000001、relay2-log.index和relay-log.info文件
(3)Master_Log_File的值为master1的二进制日志文件名称
(4)Read_Master_Log_Pos的值为master1二进制日志事件的位置
8、master2启动复制线程:
MariaDB [(none)]> start slave;
备注:
(1)start slave等同于分别执行start slave io_thread和start slave sql_thread
(2)stop slave表示停止主从复制线程
(3)重启master2所在的服务器,复制线程会自动启动
MariaDB [(none)]> show slave status\G
备注:
(1)只有当Slave_IO_Running和Slave_SQL_Running的值都为Yes时,复制线程才算启动成功
(2)Seconds_Behind_Master的值为0,说明master2没有落后于master1
(3)复制时的详细信息记录在master2的错误日志/var/log/mariadb.log中
9、master2创建具有复制权限的用户:
MariaDB [(none)]> grant replication slave,replication client on *.* to 'repluser'@'192.168.1.145' identified by '123456';
MariaDB [(none)]> flush privileges;
10、master2查看正在使用的二进制日志文件名称及事件位置:
MariaDB [(none)]> show master status;
11、master1使用具有复制权限的用户连接至master2:
MariaDB [(none)]> change master to master_host='192.168.1.146',master_user='repluser',master_password='123456',master_port=3306,master_log_file='master2-bin.000001',master_log_pos=2035;
MariaDB [(none)]> show slave status\G
备注:
(1)Slave_IO_Running和Slave_SQL_Running的值,默认为No
(2)自动在数据目录/var/lib/mysql中创建relay1-log.000001、relay1-log.index和relay-log.info文件
(3)Master_Log_File的值为master2的二进制日志文件名称
(4)Read_Master_Log_Pos的值为master2二进制日志事件的位置
12、master1启动复制线程:
MariaDB [(none)]> start slave;
备注:重启master1所在的服务器,复制线程会自动启动
MariaDB [(none)]> show slave status\G
备注:
(1)只有当Slave_IO_Running和Slave_SQL_Running的值都为Yes时,复制线程才算启动成功
(2)Seconds_Behind_Master的值为0,说明master1没有落后于master2
(3)复制时的详细信息记录在master1的错误日志/var/log/mariadb.log中
13、master1查看master2相关信息:
MariaDB [(none)]> show slave hosts;
14、master2查看master1相关信息:
MariaDB [(none)]> show slave hosts;
三、测试双主模型复制:
1、master1创建测试数据:
MariaDB [(none)]> create database db1;
MariaDB [(none)]> use db1;
MariaDB [db1]> create table tb1(id int unsigned auto_increment primary key not null,name char(20) not null);
MariaDB [db1]> desc tb1;
MariaDB [db1]> insert into tb1(name) values('zhangsan'),('lisi');
MariaDB [db1]> select * from tb1;
MariaDB [db1]> show master status;
2、master2查看测试数据:
MariaDB [(none)]> show databases;
MariaDB [(none)]> use db1;
MariaDB [db1]> show tables;
MariaDB [db1]> desc tb1;
MariaDB [db1]> select * from tb1;
MariaDB [db1]> show slave status\G
3、master2创建测试数据:
MariaDB [db1]> insert into tb1(name) values('wangwu'),('zhaoliu');
MariaDB [db1]> select * from tb1;
MariaDB [db1]> show master status;
4、master1查看测试数据:
MariaDB [db1]> select * from tb1;
MariaDB [db1]> show slave status\G