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半同步復制的實現

mysql

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]
/* */ ~]# mysql MariaDB [(none)]> grant replication slave,replication client on *.* to [email protected]%‘ identified by ‘replpasswd‘; MariaDB [(none)]> flush privileges; MariaDB [(none)]> show master status\G (查看主服務器的狀態信息,在從服務器中要用到) *************************** 1. row *************************** File: master-log.000003 (正在使用的二進制日誌文件) Position: 245 (所處的位置) Binlog_Do_DB: Binlog_Ignore_DB:

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