MaxScale读写分离

1.简介

maxscale是mariadb公司开发的一套数据库中间件，可以很方便的实现读写分离方案；并且提供了读写分离的负载均衡和高可用性保障。另外maxscale对于前端应用而言是透明的，我们可以很方便的将应用迁移到maxscale中实现读写分离方案，来分担主库的压力。maxscale也提供了sql语句的解析过滤功能。这里我们主要讲解maxscale的安装、配置以及注意事项。

 

2.安装环境

CentOS 6.5 x86_64：10.10.214.18 MaxScale

CentOS 6.5 x86_64：10.10.214.88 Master MySQL-5.6.19

CentOS 6.5 x86_64：10.10.214.89 Slave MySQL-5.6.19

CentOS 6.5 x86_64：10.10.214.90 Slave MySQL-5.6.19

配置好主从

在开始配置之前，需要在 master和slave中为 MaxScale 创建两个用户，用于监控模块和路由模块。

创建监控用户

mysql> create user scalemon@'%' identified by "123456";

mysql> grant replication slave, replication client on *.* to scalemon@'%';

mysql> grant select on test.* to scaleroute@'%';

mysql> grant select on mysql.* to scaleroute@'%';

创建路由用户

mysql> create user scaleroute@'%' identified by "123456";

mysql> grant select on mysql.* to scaleroute@'%';

flush privileges;

 

3.MaxScale安装、配置和启动

下载rpm包maxscale-2.0.1-2.centos.6.x86_64.rpm

rpm -ivh  maxscale-2.0.1-2.centos.6.x86_64.rpm

 

cat /etc/maxscale.cnf

[maxscale]
threads=1
log_info=1
logdir=/tmp/
 
[server1]
type=server
address=10.10.214.88
port=3306
protocol=MySQLBackend
serv_weight=1
 
[server2]
type=server
address=10.10.214.89
port=3306
protocol=MySQLBackend
serv_weight=3
 
[server3]
type=server
address=10.10.214.90
port=3306
protocol=MySQLBackend
serv_weight=3
 
[MySQL Monitor]
type=monitor
module=mysqlmon
servers=server1,server2,server3
user=scalemon
passwd=123456
monitor_interval=10000
#默认每隔10秒执行监控检查
 
 
[Read-Write Service]
type=service
router=readwritesplit
servers=server1,server2,server3
user=scaleroute
passwd=123456
max_slave_connections=100%
 
[Read Connection Router]
type=service
router=readconnroute
router_options=slave
servers=server1,server2,server3,server3
user=scalemon
passwd=123456
 
[MaxAdmin Service]
type=service
router=cli
 
[Read-Write Listener]
type=listener
service=Read-Write Service
protocol=MySQLClient
port=4006
#读/写分离的端口，应用连接这个端口
 
[Read Connection Listener] 
type=listener 
service=Read Connection Router 
protocol=MySQLClient 
port=4008
#slave负载均衡的端口，应用连接这个端口
 
[MaxAdmin Listener]
type=listener
service=MaxAdmin Service
protocol=maxscaled
socket=default

启动MaxScale

/etc/init.d/maxscale restart

查看具体的启动日志，有报错可以根据日志调试

tail -f /tmp/maxscale1.log

 

读写分离验证

mysql  -h10.10.214.18 -P4006 -uscalemon -p123456  test

mysql> insert into t1 values(1,'aa');

Query OK, 1 row affected (0.12 sec)

 

mysql>

mysql> insert into t1 values(2,'bb');

Query OK, 1 row affected (0.15 sec)

 

mysql> insert into t1 values(3,'cc');

Query OK, 1 row affected (0.12 sec)

 

可以看到写的全部落到了88上     

mysql> select count(*) from t1;

可以看到读全部落到了89上

 

负载均衡验证：

mysql  -h10.10.214.18 -P4008 -uscalemon -p123456  test

mysql> select count(*) from t1;

 

可以看到读平均落到了89和90上

 

maxadmin -S /tmp/maxadmin.sock

MaxScale> list services

Services.

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

Service Name              | Router Module        | #Users | Total Sessions

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

Read-Write Service        | readwritesplit       |      1 |     4

Read Connection Router    | readconnroute        |      2 |     7

MaxAdmin Service          | cli                  |      2 |     2

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

 

MaxScale> list servers

Servers.

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

Server             | Address         | Port  | Connections | Status             

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

server1            | 10.10.214.88    |  3306 |           0 | Master, Running

server2            | 10.10.214.89    |  3306 |           0 | Slave, Running

server3            | 10.10.214.90    |  3306 |           1 | Slave, Running

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