2019.10.17 MySQL半同步复制

在做MySQL主从半同步之前先做主从复制

一、部署MySQL主从半同步复制

半同步复制支持多种插件：/usr/lib64/mysql/plugin/*

半同步复制插件：

semisync_master.so

semisync_slave.so

[root@localhost ~]# rpm -ql mariadb-server | grep semisync
/usr/lib64/mysql/plugin/semisync_master.so
/usr/lib64/mysql/plugin/semisync_slave.so

1、111、112进入mysql查看插件是否安装

[root@localhost ~]# mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 6
Server version: 5.5.41-MariaDB-log MariaDB Server

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show plugins；

2、如果没有安装，则先在主节点安装并启用插件：

MariaDB [(none)]> install plugin rpl_semi_sync_master soname 'semisync_master.so';
Query OK, 0 rows affected (0.01 sec)

MariaDB [(none)]> show plugins；

MariaDB [(none)]> set @@global.rpl_semi_sync_master_enabled=ON;

Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> show global variables like '%semi%';

+------------------------------------+-------+
| Variable_name | Value |
+------------------------------------+-------+
| rpl_semi_sync_master_enabled | ON |
| rpl_semi_sync_master_timeout | 10000 |
| rpl_semi_sync_master_trace_level | 32 |
| rpl_semi_sync_master_wait_no_slave | ON |
+------------------------------------+-------+
4 rows in set (0.00 sec)

3、在从节点安装并启用插件：

MariaDB [(none)]> install plugin rpl_semi_sync_master soname 'semisync_master.so';
Query OK, 0 rows affected (0.01 sec)

MariaDB [(none)]> show plugins；

MariaDB [(none)]> set @@global.rpl_semi_sync_master_enabled=ON;

Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> show global variables like '%semi%';

4、先查看主节点，然后从节点启动IO线程，在查看主节点

MariaDB [(none)]> show global status like '%semi%';

从节点启动IO线程：

MariaDB [(none)]> stop slave IO_THREAD;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> start slave IO_THREAD;
Query OK, 0 rows affected (0.00 sec)

主节点：

5、在主节点为事先创建的用户进行主从复制授权：

MariaDB [(none)]> grant replication slave on *.* to 'myslave'@'192.168.200.%' identified by '123456';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.01 sec)

6、从节点：

MariaDB [(none)]> stop slave;
Query OK, 0 rows affected (0.01 sec)

MariaDB [(none)]> CHANGE MASTER TO
-> MASTER_HOST='192.168.200.111',
-> MASTER_USER='myslave',
-> MASTER_PASSWORD='123456',
-> MASTER_LOG_FILE='mysql-binlog.000004',
-> MASTER_LOG_POS=931;
Query OK, 0 rows affected (0.01 sec)

MariaDB [(none)]> start slave;
Query OK, 0 rows affected (0.00 sec)

7、在主节点创建数据库mydb

MariaDB [(none)]>create database nydb character set 'utf8';

Query OK, 1 row affected (0.00 sec)

在从节点查看数据库是否复制成功：

发现数据库mydb复制成功

在主节点进行数据操作：

MariaDB [(none)]> use mydb
Database changed
MariaDB [mydb]> create table tbl1 (id int,name varchar(100));
Query OK, 0 rows affected (0.03 sec）

主节点继续操作：

MariaDB [mydb]> insert into tbl1 values (1,'tom');
Query OK, 1 row affected (0.01 sec)

我们发现从节点的数据都在变化：

2019.10.17 MySQL半同步复制

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