mariadb的读写分离

实验环境：CentOS7

设备：一台主数据库服务器，两台从数据库服务器，一台调度器

主从的数据库配置请查阅：http://www.cnblogs.com/wzhuo/p/7171757.html ；

[root@~ localhost]#yum install proxysql-1.3.6-1-centos7.x86_64.rpm  mariadb-server

#配置proxysql的配置文件
[root@~ localhost]# cat /etc/proxysql.cnf
mysql_variables=
{
#数据库的端口
interfaces="0.0.0.0:3306;/tmp/proxysql.sock"
#默认的数据库
default_schema="mydb"

#定义需要调度的数据库
mysql_servers =
(
#设置三台数据库系统：写的数据库hostgroup为0；读的数据库组为1
    {
        address = "172.16.254.47" # no default, required . If port is 0 , address is interpred as a Unix Socket Domain
        port = 3306           # no default, required . If port is 0 , address is interpred as a Unix Socket Domain
        hostgroup = 0            # no default, required
        status = "ONLINE"     # default: ONLINE
        weight = 1            # default: 1
        compression = 0       # default: 0
#   max_replication_lag = 10  # default 0 . If greater than 0 and replication lag passes such threshold, the server is shunned
    },
    {
        address = "172.16.253.177"
        port = 3306
        hostgroup = 1
    },
    {
        address= "172.16.252.182"
        port= 3306
        hostgroup= 1
        max_connections=200
    }

#定义可登陆的用户（需要现在master数据库上进行授权
#  如
MariaDB [hellodb]> grant all on *.* to 'myadmin'@'172.16.%.%' identified by '123456';

#）
mysql_users:
(
    {
        username = "myadmin" # no default , required
        password = "123456" # default: ''
        default_hostgroup = 0 # default: 0
        active = 1            # default: 1
        default_schema="mydb"
    }
#定义读写的组：
mysql_replication_hostgroups=
(
        {
                writer_hostgroup=0
                reader_hostgroup=1
                comment="test repl 1"
       }
[root@~ localhost]#systemctl start proxysql.service
[root@~ localhost]#ss -ntl
State      Recv-Q Send-Q Local Address:Port               Peer Address:Port
LISTEN     0      128           *:3306                      *:*
LISTEN     0      128    127.0.0.1:6032                      *:*
#测试:使用本机ip登陆：
[root@~ localhost]#mysql -h172.16.252.142 -umyadmin -p
MySQL [(none)]> create database testtest;
MySQL [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| hellodb            |
| mydb               |
| mysql              |
| performance_schema |
| test               |
| testdb             |
| testtest
#组0的数据库：
MariaDB [hellodb]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| hellodb            |
| mydb               |
| mysql              |
| performance_schema |
| test               |
| testdb             |
| testtest     

#组1的数据库；
MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| hellodb            |
| mydb               |
| mysql              |
| performance_schema |
| test               |
| testdb             |
| testtest