maxscale实现MySQL负载均衡

maxscale实现MySQL负载均衡

原因

因为公司最近的请求量逐渐增加，原本的一主一从服务器无法支撑起系统的稳定运行，需要扩充从库，但从库扩大，如何保证所有的数据库可以进行负载均衡呢？找了一些大佬，了解到可以使用maxscale达到此目的。

准备

服务器基本配置

服务器	配置	备注
阿里云服务器(119)	4核8G	master(主库)
阿里云服务器(39)	16核32G	slave1(从库一)
电信服务器(59)	8核16G	slave2(从库二)
阿里云服务器(40)	2核4G	master2(备库)

系统配置

软件	版本	备注
CentOS	7.5
MySQL	5.7
maxscale	2.4

动手

1、首先，配置MySQL主从，实现主从复制

2、配置Maxscale

#maxscale配置
# MaxScale documentation:
# https://mariadb.com/kb/en/mariadb-enterprise/mariadb-maxscale-23/

# Global parameters
#
# Complete list of configuration options:
# https://mariadb.com/kb/en/mariadb-maxscale-23-mariadb-maxscale-configuration-usage-scenarios/

[maxscale]
threads=auto

# Server definitions
#
# Set the address of the server to the network
# address of a MariaDB server.
#

[server1]
type=server
address=119.*.*.*
port=3306
protocol=MariaDBBackend

[server2]
type=server
address=39.*.*.*
port=3306
protocol=MariaDBBackend

[server3]
type=server
address=59.*.*.*
port=3306
protocol=MariaDBBackend

[server4]
type=server
address=40.*.*.*
port=3306
protocol=MariaDBBackend






# Monitor for the servers
#
# This will keep MaxScale aware of the state of the servers.
# MariaDB Monitor documentation:
# https://mariadb.com/kb/en/mariadb-maxscale-23-mariadb-monitor/

[MariaDB-Monitor]
type=monitor
module=mariadbmon
servers=server1,server4
user=
password=
monitor_interval=2000

# Service definitions
#
# Service Definition for a read-only service and
# a read/write splitting service.
#

# ReadConnRoute documentation:
# https://mariadb.com/kb/en/mariadb-maxscale-23-readconnroute/

[Read-Only-Service]
type=service
router=readconnroute
servers=server2,server3
user=
password=
router_options=slave

# ReadWriteSplit documentation:
# https://mariadb.com/kb/en/mariadb-maxscale-23-readwritesplit/

[Read-Write-Service]
type=service
router=readwritesplit
servers=server1,server4
user=
password=

# Listener definitions for the services
#
# These listeners represent the ports the
# services will listen on.
#

[Read-Only-Listener]
type=listener
service=Read-Only-Service
protocol=MariaDBClient
port=4008

[Read-Write-Listener]
type=listener
service=Read-Write-Service
protocol=MariaDBClient
port=4006

在maxscale配置中，最新版2.4中容易踩的坑有：

1、2.4中移除MySQL驱动，全部统一使用MariaDB驱动，即上面配置文件中，选择驱动的时候，不需要修改**[MariaDB Monitor]为[MySQL Monitor]**

2、maxscale连接的字符串为你在主服务器所创建的账号，例如：账号是eee，密码是：123456，那么连接的字符串就是

mysql -ueee -p123456 -H127.0.0.1 -P4006

引用

1、MySQL主从备份方案

2、Maxscale配置方案

3、Maxscale官方文档