MaxScale实现mysql读写分离，负载均衡

文档地址：https://github.com/mariadb-corporation/MaxScale/blob/2.1/Documentation/Documentation-Contents.md

1，maxscale安装

下载地址：https://downloads.mariadb.com/MaxScale/2.1.3/centos/7/x86_64/

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wget https://downloads.mariadb.com/MaxScale/2.1.3/centos/7/x86_64/maxscale-2.1.3-1.centos.7.x86_64.rpm
yum list installed | grep maxscale 查看是否安装过maxscale yum remove -y maxscale.x86_64 卸载之前的版本 yum install -y maxscale-2.1.3-1.centos.7.x86_64.rpm 安装rpm包

2，配置文件路径

vim /etc/maxscale.cnf 配置文件
/var/log/maxscale/maxscale.log日志文件
maxscale --config=/etc/maxscale.cnf---->maxadmin
/usr/share/maxscale/maxscale start / stop/ restart/ reload启动脚本 centos6 /etc/init.d/maxscale

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3，mysql增加用户

添加maxscale监控以及获取user表信息的用户
create user 'maxscale'@'%' identified by 'maxscale';
grant select on mysql.user to 'maxscale'@'%';
grant select on mysql.db to 'maxscale'@'%';
grant select on mysql.tables_priv to 'maxscale'@'%';
grant show databases on . to 'maxscale'@'%';
grant replication client on . to 'maxscale'@'%';

（重点）添加连接maxscale代理的客户端用户。（机器多个ip，都要进行添加，包括内网ip）
client用户，并增加代理访问db的权限。
grant all privileges on . to 'scaleclient'@'192.168.0.62' identified by 'scaleclient';
grant all privileges on . to 'scaleclient'@'192.168.0.63' identified by 'scaleclient';
登录代理若连不上代理，查看log或者是mysql用户权限配置不正确

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