MaxScale Binlog Server实践

在之前的博文中有说到MaxScale,作为中间件,配合MHA使用或者主从使用可实现读写分离和负载均衡,今天简单介绍下MaxScale作为Binlog Server来减少主从延迟的问题;MySQL的主从架构中,链式拓扑的架构比较容易出现主从延迟的问题。本文着重介绍MaxScale作为Binlog Server是如何降低主从延迟的。

MaxScale配合MHA请移步至:

Part2:本文环境

HE1:192.168.1.248 slave

HE3:192.168.1.250 master

HE4:192.168.1.251 maxscale

架构演示

MaxScale Binlog Server实践

实战

Part1:安装maxscale

[root@HE4 ~]# yum -y install maxscale-2.0.1-2.CentOS.6.x86_64.rpm

[root@HE4 ~]# mkdir -p /data/binlog

[root@HE4 ~]# useradd maxscale

[root@HE4 ~]# chown -R maxscale. /data/binlog

[root@HE4 ~]# cat /etc/maxscale.cnf

[maxscale]

threads=1

##根据CPU核数设置

[Replication]

type=service

router=binlogrouter

user=mysync

passwd=MANAGER

# 使用主库上的repl复制账号

# 权限:

#  GRANT REPLICATION SLAVE,REPLICATION CLIENT ON *.* TO 'repl'@'%' IDENTIFIED BY  'repl';

router_options=server_id=1251,heartbeat=30,binlogdir=/data/binlog,transaction_safety=1,mariadb10-compatibility=1,send_slave_heartbeat=1

# server_id设置maxscale的,记得不能与主和从库重复,要唯一

#  heartbeat=30秒,意思为当maxscale在30秒内没有接收到主库推送的binlog日志,发送心跳检查

#  binlogdir设置接收binlog的存放路径,目录属性chown -R maxscale.maxscale  /data/binlog

# transaction_safety=1此参数用于启用binlog日志中的不完整事务检测。  当MariaDB MaxScale启动时,如果当前binlog文件已损坏或找到不完整的事务,则可能会出现错误消息。  在正常工作期间,binlog事件不会分配到从库,直到事务已经提交。 默认值为off,设置transaction_safety = on以启用不完全事务检测。

#  send_slave_heartbeat=1开启心跳检查

[Replication  Listener]

type=listener

service=Replication

protocol=MySQLClient

port=5308

# 后端的从库CHANGE  MASTER TO这个端口,默认5308

[CLI]

type=service

router=cli

[CLI Listener]

type=listener

service=CLI

protocol=maxscaled

port=6603

Part2:启动Maxscale

[root@HE4 ~]# /etc/init.d/maxscale start

Starting MaxScale: maxscale (pid 16680) is running...      [  OK  ]

[root@HE4 ~]# /etc/init.d/maxscale status

Checking MaxScale status: MaxScale (pid  16680) is running.[  OK  ]


Part2:从库配置

[root@HE1 ~]# mysql -umysync -pMANAGER -h192.168.1.251 -P5308

Welcome to the MariaDB monitor.  Commands end with ; or \g.

Your MySQL connection id is 3196

Server version: 10.0.0 2.0.1-maxscale

Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.

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

MySQL [(none)]>  CHANGE MASTER TO MASTER_HOST='192.168.1.250',MASTER_USER='mysync',MASTER_PASSWORD='MANAGER',MASTER_PORT=3306,MASTER_LOG_FILE='mysql-bin.000005',MASTER_LOG_POS=20;

ERROR 1234 (42000): Can not set MASTER_LOG_POS to 20: Permitted binlog pos is 4. Specified master_log_file=mysql-bin.000005

MySQL [(none)]>  CHANGE MASTER TO MASTER_HOST='192.168.1.250',MASTER_USER='mysync',MASTER_PASSWORD='MANAGER',MASTER_PORT=3306,MASTER_LOG_FILE='mysql-bin.000005',MASTER_LOG_POS=4;

MySQL [(none)]> start slave;

Query OK, 0 rows affected (0.00 sec)

这里可以看出,Maxscale binlog server只能从位置4开始配置

配置好后,在/data/binlog下生成的binlog文件

[root@HE4 ~]# cd /data/binlog/

[root@HE4 binlog]# ls

cache  master.ini  mysql-bin.000003

Part2:主库配置

[root@HE3 ~]# mysql -uroot -p

Enter password:

Welcome to the MariaDB monitor.  Commands end with ; or \g.

Your MariaDB connection id is 7

Server version: 10.1.16-MariaDB MariaDB Server

Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.

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

MariaDB [(none)]> show master status;

+------------------+----------+--------------+------------------+

| File            | Position | Binlog_Do_DB | Binlog_Ignore_DB |

+------------------+----------+--------------+------------------+

| mysql-bin.000005 |      652 |              |                  |

+------------------+----------+--------------+------------------+

1 row in set (0.00 sec)

MariaDB [(none)]>  grant replication client,replication slave on *.* to 'mysync'@'192.168.1.%' identified by 'MANAGER';

MariaDB [(none)]>flush privileges;

Part3:主从配置

从库指向binlogserver

[root@HE1 ~]# mysql -uroot -pMANAGER

Welcome to the MariaDB monitor.  Commands end with ; or \g.

Your MariaDB connection id is 5

Server version: 10.1.16-MariaDB MariaDB Server

Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.

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

MariaDB [(none)]> CHANGE MASTER TO MASTER_HOST='192.168.1.251',MASTER_USER='mysync',MASTER_PASSWORD='MANAGER',MASTER_PORT=5308,MASTER_LOG_FILE='mysql-bin.000005',MASTER_LOG_POS=652;

Query OK, 0 rows affected (0.02 sec)

MariaDB [(none)]> start slave;

Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> show slave status\G

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 192.168.1.251

Master_User: mysync

Master_Port: 5308

Connect_Retry: 60

Master_Log_File: mysql-bin.000005

Read_Master_Log_Pos: 652

Relay_Log_File: mysql-relay-bin.000002

Relay_Log_Pos: 537

Relay_Master_Log_File: mysql-bin.000005

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: 652

Relay_Log_Space: 835

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: 1250

Master_SSL_Crl:

Master_SSL_Crlpath:

Using_Gtid: No

Gtid_IO_Pos:

Replicate_Do_Domain_Ids:

Replicate_Ignore_Domain_Ids:

Parallel_Mode: conservative

1 row in set (0.00 sec)

——总结——

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