半同步復制的實現
1、在主服務器上的配置
1)安裝mariadb-server
[[email protected] ~]# yum -y install mariadb-server
2)編輯/etc/my.cnf
[[email protected] ~]# vim /etc/my.cnf skip_name_resolve = ON innodb_file_per_table = ON server-id = 1 log-bin = master-log
3)授權可以復制本地數據庫信息的主機
[[email protected] ~]# systemctl start mariadb.service (啟動mariadb server) [[email protected]
4)安裝rplsemisync_master插件,並啟用
[[email protected] ~]# mysql MariaDB [(none)]> install plugin rpl_semi_sync_master soname ‘semisync_master.so‘; MariaDB [(none)]> set global rpl_semi_sync_master_enabled = ON; 補充: MariaDB [(none)]> show plugins;(可查看插件是否激活) MariaDB [(none)]> show global variables like ‘rpl_semi%‘;(可查看安裝的插件是否啟用) MariaDB [(none)]> show global status like ‘%semi%‘;(可查看從服務器的個數,此時是0個)
2、從服務器的配置
1)安裝mariadb-server
[[email protected] ~]# yum -y install mariadb-server
2)編輯/etc/my.cnf文件
[[email protected] ~]# vim /etc/my.cnf 在[mysqld]段的最後添加以下內容 skip_name_resolve = ON innodb_file_per_table = ON server-id = 2 (id號不能跟主服務器相同) relay-log = slave-log (自定義二進制日誌文件名)
3)設置要從哪個主服務器的那個位置開始同步
[[email protected] ~]# systemctl start mariadb.service [[email protected] ~]# 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=245;
4)安裝rplsemisync_slave插件並啟用
[[email protected] ~]# 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;
完成上面配置後,可以在主服務器上查看半同步復制的相關信息,命令如下:
MariaDB [(none)]> show global status like ‘%semi%‘; Rpl_semi_sync_master_clients 1 (從服務器有一臺)
3、測試
測試以個人實際情況而定
1)在主服務器上導入事先準備好的數據庫hellodb.sql
MariaDB [hellodb]> source /root/hellodb.sql;
2)在主服務器上查看半同步復制的狀態
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)在從服務器上查看是否同步
MariaDB [(none)]> show databases; MariaDB [(none)]> use hellodb; MariaDB [hellodb]> select * from students;
補充:基於上面的半同步復制配置復制的過濾器,復制過濾最好在從服務器上設置,步驟如下
1、從服務器的配置
1)關閉mariadb server
[[email protected] ~]# systemctl stop mariadb.service
2)編輯/etc/my.cnf文件
[[email protected] ~]# vim /etc/my.cnf skip_name_resolve = ON innodb_file_per_table = ON server-id = 2 relay-log = slave-log replicate-do-db = mydb (只復制mydb數據庫的內容) 補充:常用的過濾選項如下 Replicate_Do_DB= Replicate_Ignore_DB= Replicate_Do_Table= Replicate_Ignore_Table= Replicate_Wild_Do_Table= Replicate_Wild_Ignore_Table=
3)重啟mariadb server
[[email protected] ~]# systemctl start mariadb.service
4)重啟mariadb server後,半同步復制功能將被關閉,因此要重新啟動
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;(需先關閉從服務器復制功能再重啟) MariaDB [(none)]> start slave;
2、測試
1)主服務器上的hellodb數據庫創建一個新表semitable
MariaDB [hellodb]> create table semitable (id int);
2)在從服務器上查看hellodb數據庫是否有semitable
MariaDB [(none)]> use hellodb MariaDB [hellodb]> show tables;(並沒有) +-------------------+ | Tables_in_hellodb | +-------------------+ | classes | | coc | | courses | | scores | | students | | teachers | | toc | +-------------------+
3)在主服務器上創建mydb數據庫,並為其創建一個tbl1表
MariaDB [hellodb]> create database mydb;
4)在從服務器上查看mydb數據庫的是否有tbl1表
MariaDB [hellodb]> use mydb; MariaDB [mydb]> show tables; (可以查看到) +----------------+ | Tables_in_mydb | +----------------+ | tbl1 | +----------------+
本文出自 “汪立明” 博客,請務必保留此出處http://afterdawn.blog.51cto.com/7503144/1928231
半同步復制的實現