简单的主从复制

简单的主从复制

配置文件说明

master：

cat /etc/my.cnf
[client]
port = 3306
socket = /data/soft/mysql/mysql.sock

[mysqld]
user    = mysql
port    = 3306
socket  = /data/soft/mysql/mysql.sock
basedir = /data/soft/mysql
datadir = /data/soft/mysql/data
log-bin = /data/soft/mysql/mysql-bin
server-id = 106  # server id 不能相同 可以选择使用主机ip最后三位
skip_name_resolve = 0 # 跳过域名解析参数

[mysqld_safe]
log-error=/data/soft/mysql/mysql.log
pid-file=/data/soft/mysql/mysqld.pid

slave：

cat /etc/my.cnf
[client]
port = 3306
socket = /data/soft/mysql/mysql.sock

[mysqld]
user    = mysql
port    = 3306
socket  = /data/soft/mysql/mysql.sock
basedir = /data/soft/mysql
datadir = /data/soft/mysql/data
log-bin = /data/soft/mysql/mysql-bin
server-id = 107  # server id 不能相同 可以选择使用主机ip最后三位
skip_name_resolve = 0 # 跳过域名解析参数
read_only = 1  # 从库只读 （非root用户 ）

[mysqld_safe]
log-error=/data/soft/mysql/mysql.log
pid-file=/data/soft/mysql/mysqld.pid

创建主从复制用户

master

mysql > grant replication slave  on *.* to repl@'%' identified by '123456';

初始化从库数据

master：
备份主库当前数据

 mysqldump -uroot -p123456 -A -B -F --master-data=2 >/tmp/full.sql

slave：
导入数据

mysql > set sql_log_bin=0;
mysql > source /tmp/full.sql;

开启从库复制

master：
查看当前使用的文件以及POS号

mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000012 |      120 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

slave:
配置主从复制

mysql > CHANGE MASTER TO
  MASTER_HOST='10.0.0.52',
  MASTER_USER='repl',
  MASTER_PASSWORD='123456',
  MASTER_PORT=3306,
  MASTER_LOG_FILE='mysql-bin.000012',
  MASTER_LOG_POS=120;

启动主从复制

mysql > start  slave;

测试主从同步

查看slave状态:主要查看Slave_IO_Running 与 Slave_SQL_Running 是否都为Yes

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.0.0.52
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000010
          Read_Master_Log_Pos: 842
               Relay_Log_File: 3307-relay-bin.000018
                Relay_Log_Pos: 283
        Relay_Master_Log_File: mysql-bin.000010
             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: 842
              Relay_Log_Space: 455
              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: 0
Master_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: 6
                  Master_UUID: 4f344556-e0ab-11e7-9138-000c29d60ab3
             Master_Info_File: /data/3307/data/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
           Master_Retry_Count: 86400
                  Master_Bind: 
      Last_IO_Error_Timestamp: 
     Last_SQL_Error_Timestamp: 
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
           Retrieved_Gtid_Set: 
            Executed_Gtid_Set: 
                Auto_Position: 0
1 row in set (0.00 sec)

主库创建新的库

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test               |
+--------------------+
4 rows in set (0.00 sec)
mysql > create database clsn;

查看从库

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| clsn               |
| mysql              |
| performance_schema |
| test               |
+--------------------+
5 rows in set (0.00 sec)

到此mysql主从复制就搭建完成

半同步复制配置

加载插件

master

mysql > INSTALL PLUGIN rpl_semi_sync_master SONAME 'semisync_master.so';

slave

mysql > INSTALL PLUGIN rpl_semi_sync_slave SONAME 'semisync_slave.so';

检查插件是否加载成功

mysql > show plugins;

启动半同步复制

master

mysql > SET GLOBAL rpl_semi_sync_master_enabled = 1;

slave

SET GLOBAL rpl_semi_sync_slave_enabled = 1;

查看半同步是否在运行
master

mysql > show status like 'Rpl_semi_sync_master_status';

slave

mysql < show status like 'Rpl_semi_sync_slave_status';

重启从库上的IO线程

slave

mysql > STOP SLAVE IO_THREAD;
mysql > START SLAVE IO_THREAD;

测试半同步复制

slave
查看延迟时间：rpl_semi_sync_slave_trace_level默认好像是32，可以通过CHANGE MASTER TO MASTER_DELAY = 30;设置

mysql> show variables like '%rpl_semi_sync%';
+---------------------------------+-------+
| Variable_name                   | Value |
+---------------------------------+-------+
| rpl_semi_sync_slave_enabled     | ON    |
| rpl_semi_sync_slave_trace_level | 32    |
+---------------------------------+-------+
2 rows in set (0.00 sec)

停止从库复制

stop slave;

master
创建新的库查，如果创建库的等待时间为设置的时间就证明是成功的

create database clsn;  # 此处创建应该需要等待32秒才返回成功