MariaDB的主从复制、主主复制、半同步复制

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这篇文章主要详细介绍了mariadb的主从复制、主主复制、半同步复制的概念和方法。

参考http://www.jb51.net/article/97786.htm

主从服务器的时间要同步,数据库版本最好是一致的,以免造成函数处理、日志读取、日志解析等发生异常。
以下三个主从复制的设置是独立的。
注意防火墙和selinux的影响。

1、简单主从复制的实现

1.1 服务器1操作

1)安装mariadb-server

[root@localhost ~]# yum -y install mariadb-server

2)编辑/etc/my.cnf文件

在[mysqld]段的最后添加以下内容

[root@localhost ~]# vim /etc/my.cnfskip_name_resolve = ONinnodb_file_per_table = ON    server-id = 1 (id号不能跟从服务器相同)    log-bin = master-log (自定义二进制日志文件名)

3)授权可以复制本地数据库信息的主机

[root@localhost ~]# systemctl start mariadb.service (启动mariadb server)[root@localhost ~]# mysqlMariaDB [(none)]> grant replication slave,replication client on *.* to 'repluser'@'10.1.51.%' identified by 'replpasswd'; MariaDB [(none)]> flush privileges;MariaDB [(none)]> show master status\G (查看主服务器的状态信息,在从服务器中要用到)*************************** 1. row ***************************File: master-log.000003 (正在使用的二进制日志文件)Position: 497 (所处的位置)Binlog_Do_DB:Binlog_Ignore_DB:

1.2 从服务器的配置

1)安装mariadb-server

[root@localhost ~]# yum -y install mariadb-server

2)编辑/etc/my.cnf文件

在[mysqld]段的最后添加以下内容

[root@localhost ~]# vim /etc/my.cnfskip_name_resolve = ONinnodb_file_per_table = ONserver-id = 2 (id号不能跟主服务器相同)relay-log = slave-log (自定义二进制日志文件名)

3)设置要从哪个主服务器的那个位置开始同步

[root@localhost ~]# systemctl start mariadb.service[root@localhost ~]# mysql MariaDB [(none)]> change master to master_host='10.1.51.60',master_user='repluser',master_password='replpasswd',master_log_file='master-log.000003',master_log_pos=497;MariaDB [(none)]> start slave; (启动复制功能)MariaDB [(none)]> show slave status\G (查看从服务器的状态,下面显示的是部分内容) Master_Host: 10.1.51.60 Master_User: repluser Master_Port: 3306 Connect_Retry: 60 Master_Log_File: master-log.000003 Read_Master_Log_Pos: 497 Relay_Log_File: slave-log.000002 Relay_Log_Pos: 530 Relay_Master_Log_File: master-log.000003 Slave_IO_Running: Yes Slave_SQL_Running: Yes Master_Server_Id: 1

1.3 测试

1)在主服务器导入事先准备好的数据库

[root@localhost ~]# mysql < hellodb.sql

2)在从服务器查看是否同步

MariaDB [(none)]> show databases;+--------------------+| Database   |+--------------------+| information_schema || hellodb   |(数据库已经同步)| mysql    || performance_schema || test    |+--------------------+MariaDB [(none)]> use hellodb;MariaDB [hellodb]> show tables; (hellodb数据库的表也是同步的)+-------------------+| Tables_in_hellodb |+-------------------+| classes   || coc    || courses   || scores   || students   || teachers   || toc    |+-------------------+

2、双主复制的实现

2.1 安装MariaDB

服务器1的操作:

1)安装mariadb-server

[root@localhost ~]# yum -y install mariadb-server

2)编辑/etc/my.cnf文件

[root@localhost ~]# vim /etc/my.cnf在[mysqld]段的最后添加以下内容skip_name_resolve = ONinnodb_file_per_table = ONserver-id = 1 (id号不能跟从服务器相同)log-bin = master-log (自定义主服务器的二进制日志文件名)relay-log = slave-log (自定义从服务器的二进制日志文件名)auto_increment_offset = 1 auto_increment_increment = 2

3)启动服务

[root@localhost ~]# systemctl start mariadb.service[root@localhost ~]#systemctl enable mariadb.service

服务器2的操作:

1)安装mariadb-server

[root@localhost ~]# yum -y install mariadb-server

2)编辑/etc/my.cnf文件

[root@localhost ~]# vim /etc/my.cnfskip_name_resolve = ONinnodb_file_per_table = ONserver-id = 2relay-log = slave-loglob-bin = master-logauto_increment_offset = 2 auto_increment_increment = 2

3)启动服务

[root@localhost ~]# systemctl start mariadb.service[root@localhost ~]#systemctl enable mariadb.service

2.2 配置双主复制

1) 在服务器2上查看的master状态

说明:记录数据,在服务器2上配置时会用到。

MariaDB [(none)]> show master status\G*************************** 1. row ***************************File: master-log.000003Position: 521Binlog_Do_DB:Binlog_Ignore_DB:

2)服务器1上进行如下配置

说明:以下配置的内容为服务器2的IP及服务器2上查到的master数据。

[root@localhost ~]# mysqlMariaDB [(none)]> grant replication slave,replication client on *.* to 'repluser'@'192.168.1.%' identified by 'replpasswd';MariaDB [(none)]> change master to master_host='192.168.1.188',master_user='repluser',master_password='replpasswd',master_log_file='master-log.000003',master_log_pos=521;MariaDB [(none)]> start slave;MariaDB [(none)]> SHOW SLAVE STATUS\G*************************** 1. row ***************************              Slave_IO_State: Waiting for master to send event                  Master_Host: 192.168.1.188                  Master_User: repluser                  Master_Port: 3306                Connect_Retry: 60              Master_Log_File: master-log.000003          Read_Master_Log_Pos: 521              Relay_Log_File: slave-log.000002                Relay_Log_Pos: 806        Relay_Master_Log_File: master-log.000003            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: 521              Relay_Log_Space: 1094              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: 0Master_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: 21 row in set (0.00 sec)

3)在服务器1查看master状态

MariaDB [(none)]> show master status\G*************************** 1. row ***************************File: master-log.000003Position: 795Binlog_Do_DB: Binlog_Ignore_DB:

4)服务器2上进行如下配置

说明:以下的配置内容为服务器1的IP及服务器1中查到的master信息
[root@localhost ~]# mysql

 MariaDB [(none)]> grant replication slave,replication client on *.* to 'repluser'@'192.168.1.%' identified by 'replpasswd'; MariaDB [(none)]> change master to master_host='192.168.1.187',master_user='repluser',master_password='replpasswd',master_log_file='master-log.000003',master_log_pos=795; MariaDB [(none)]> start slave; MariaDB [(none)]> show slave status\G*************************** 1. row ***************************              Slave_IO_State: Waiting for master to send event                  Master_Host: 192.168.1.187                  Master_User: repluser                  Master_Port: 3306                Connect_Retry: 60              Master_Log_File: master-log.000003          Read_Master_Log_Pos: 795              Relay_Log_File: slave-log.000002                Relay_Log_Pos: 530        Relay_Master_Log_File: master-log.000003            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: 795              Relay_Log_Space: 818              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: 0Master_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: 11 row in set (0.00 sec)

2.3 测试

1)在任意一台服务器上创建mydb数据库

MariaDB [(none)]> create database mydb;

2)在另一台服务器上查看

MariaDB [(none)]> show databases;+--------------------+| Database   |+--------------------+| information_schema || mydb    || mysql    || performance_schema || test    |+--------------------+

3、半同步复制的实现

3.1 在主服务器上的配置

1)安装mariadb-server

[root@localhost ~]# yum -y install mariadb-server

2)编辑/etc/my.cnf

[root@localhost ~]# vim /etc/my.cnf    skip_name_resolve = ON    innodb_file_per_table = ON    server-id = 1    log-bin = master-log

3)授权可以复制本地数据库信息的主机

[root@localhost ~]# systemctl start mariadb.service (启动mariadb server)[root@localhost ~]# mysql MariaDB [(none)]> grant replication slave,replication client on *.* to 'repluser'@'10.1.51.%' identified by 'replpasswd'; MariaDB [(none)]> flush privileges;MariaDB [(none)]> show master status\G (查看主服务器的状态信息,在从服务器中要用到)*************************** 1. row ***************************File: master-log.000003 (正在使用的二进制日志文件)Position: 245 (所处的位置)Binlog_Do_DB:Binlog_Ignore_DB:

4)安装rpl semi sync_master插件,并启用

[root@localhost ~]# mysqlMariaDB [(none)]> install plugin rpl_semi_sync_master soname 'semisync_master.so';MariaDB [(none)]> set global rpl_semi_sync_master_enabled = ON;补充:MariaDB [(none)]> show plugins;(可查看插件是否激活)MariaDB [(none)]> show global variables like 'rpl_semi%';(可查看安装的插件是否启用)MariaDB [(none)]> show global status like '%semi%';(可查看从服务器的个数,此时是0个)

3.2从服务器的配置

1)安装mariadb-server

[root@localhost ~]# yum -y install mariadb-server

2)编辑/etc/my.cnf文件

在[mysqld]段的最后添加以下内容[root@localhost ~]# vim /etc/my.cnfskip_name_resolve = ONinnodb_file_per_table = ONserver-id = 2 (id号不能跟主服务器相同)relay-log = slave-log (自定义二进制日志文件名)

3)设置要从哪个主服务器的那个位置开始同步

[root@localhost ~]# systemctl start mariadb.service[root@localhost ~]# mysqlMariaDB [(none)]> change master to master_host='10.1.51.60',master_user='repluser',master_password='replpasswd',master_log_file='master-log.000003',master_log_pos=245;

4)安装rpl semi sync_slave插件并启用

[root@localhost ~]# mysql MariaDB [(none)]> install plugin rpl_semi_sync_slave soname 'semisync_slave.so'; MariaDB [(none)]> set global rpl_semi_sync_slave_enabled = ON; MariaDB [(none)]> start slave;

完成上面配置后,可以在主服务器上查看半同步复制的相关信息,命令如下:
MariaDB [(none)]> show global status like ‘%semi%’;
Rpl_semi_sync_master_clients 1 (从服务器有一台)

3.3 测试

测试以个人实际情况而定

1)在主服务器上导入事先准备好的数据库hellodb.sql

MariaDB [hellodb]> source /root/hellodb.sql;

2)在主服务器上查看半同步复制的状态

MariaDB [hellodb]> show master status;+-------------------+----------+--------------+------------------+| File    | Position | Binlog_Do_DB | Binlog_Ignore_DB |+-------------------+----------+--------------+------------------+| master-log.000003 |  8102 |    |     |+-------------------+----------+--------------+------------------+MariaDB [hellodb]> show global status like '%semi%';+--------------------------------------------+-------+| Variable_name        | Value |+--------------------------------------------+-------+| Rpl_semi_sync_master_clients    | 1  || Rpl_semi_sync_master_net_avg_wait_time  | 1684 || Rpl_semi_sync_master_net_wait_time   | 60630 || Rpl_semi_sync_master_net_waits    | 36 || Rpl_semi_sync_master_no_times    | 1  || Rpl_semi_sync_master_no_tx     | 1  || Rpl_semi_sync_master_status    | ON || Rpl_semi_sync_master_timefunc_failures  | 0  || Rpl_semi_sync_master_tx_avg_wait_time  | 1884 || Rpl_semi_sync_master_tx_wait_time   | 65965 || Rpl_semi_sync_master_tx_waits    | 35 || Rpl_semi_sync_master_wait_pos_backtraverse | 0  || Rpl_semi_sync_master_wait_sessions   | 0  || Rpl_semi_sync_master_yes_tx    | 35 |+--------------------------------------------+-------+

3)在从服务器上查看是否同步

MariaDB [(none)]> show databases;MariaDB [(none)]> use hellodb;MariaDB [hellodb]> select * from students;

4 补充:

基于上面的半同步复制配置复制的过滤器,复制过滤最好在从服务器上设置,步骤如下

4.1 从服务器的配置

1)关闭mariadb server

[root@localhost ~]# systemctl stop mariadb.service

2)编辑/etc/my.cnf文件

[root@localhost ~]# vim /etc/my.cnfskip_name_resolve = ONinnodb_file_per_table = ONserver-id = 2relay-log = slave-logreplicate-do-db = mydb (只复制mydb数据库的内容)

补充:常用的过滤选项如下

Replicate_Do_DB=Replicate_Ignore_DB=Replicate_Do_Table=Replicate_Ignore_Table=Replicate_Wild_Do_Table=Replicate_Wild_Ignore_Table=

3)重启mariadb server

[root@localhost ~]# systemctl start mariadb.service

4)重启mariadb server后,半同步复制功能将被关闭,因此要重新启动

MariaDB [(none)]> show global variables like '%semi%';+---------------------------------+-------+| Variable_name     | Value |+---------------------------------+-------+| rpl_semi_sync_slave_enabled  | OFF || rpl_semi_sync_slave_trace_level | 32 |+---------------------------------+-------+MariaDB [(none)]> set global rpl_semi_sync_slave_enabled = ON;MariaDB [(none)]> stop slave;(需先关闭从服务器复制功能再重启)MariaDB [(none)]> start slave;

4.2测试

1)主服务器上的hellodb数据库创建一个新表semitable

MariaDB [hellodb]> create table semitable (id int);

2)在从服务器上查看hellodb数据库是否有semitable

MariaDB [(none)]> use hellodbMariaDB [hellodb]> show tables;(并没有)+-------------------+| Tables_in_hellodb |+-------------------+| classes   || coc    || courses   || scores   || students   || teachers   || toc    |+-------------------+

3)在主服务器上创建mydb数据库,并为其创建一个tbl1表

MariaDB [hellodb]> create database mydb;

4)在从服务器上查看mydb数据库的是否有tbl1表

MariaDB [hellodb]> use mydb;MariaDB [mydb]> show tables; (可以查看到)+----------------+| Tables_in_mydb |+----------------+| tbl1   |+----------------+
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