mysql-proxy实现MySQL读写分离

使用二进制格式的mysql-proxy的安装配置

  • mysql-proxy本身并不能进行读写分离,要实现读写分离要依赖于lua,所以要先查看是否安装了lua,如果没有安装使用yum install安装上即可

    ~]# rpm -q lua
    lua-5.1.4-4.1.el6.x86_64
  • 创建系统用户

    useradd -r mysql-proxy
  • 解压包创建链接文件

    tar zxf mysql-proxy-0.8.5-linux-el6-x86-64bit.tar.gz -C /usr/local/
    ln -s mysql-proxy-0.8.5-linux-el6-x86-64bit/ mysql-proxy
  • 导出二进制程序

    ~]# vim /etc/profile.d/mysql-proxy.sh
    内容为:
    export PATH=/usr/loca/mysql-proxy/bin/:$PATH
    ~]# source  /etc/profile.d/mysql-proxy.sh
  • 查看mysql-proxy用法

    ~]# mysql-proxy --help-all
    #比较重要的选项有以下几个
    --daemon   #让mysql-proxy在后台工作
    --user=  #指定运行mysql-proxy进程的属主
    --proxy-backend-addresses=  #后端服务器
    --proxy-read-only-backend-addresses=  #只允许读的后端服务器
    --log-level=(error|warning|info|message|debug) #指定日志级别
    --log-file= #指定日志文件路径
    --plugins=  #要加载的插件名,插件路径在/usr/local/mysql-proxy/lib/mysql-proxy/plugins,该路径下有一个libadmin.so的插件,可以用来管理后端服务器,还有libproxy.so的插件,启用proxy的功能
    --keepalive  #如果proxy崩溃了,就会尝试去重启proxy
    --proxy-lua-script= #指定要使用的lua脚本文件,lua脚本路径在/usr/local/mysql-proxy/share/doc/mysql-proxy,该路径下有一个实现读写分离的lua脚本文件rw-splitting.lua
    --defaults-file #指定配置文件路径
  • 启用mysql-proxy

    ~]# mysql-proxy --daemon \
    > --user=mysql-proxy \
    > --log-level=debug \
    > --log-file=/var/log/mysql-proxy.log \
    > --plugins=proxy \
    > --plugins=admin \
    > --proxy-backend-addresses=172.25.78.2:3306 \
    > --proxy-read-only-backend-addresses=172.25.78.3:3306 \
    > --keepalive=true \
    > --proxy-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua \
    > --admin-username=admin \
    > --admin-password=adminpass \
    > --admin-lua-script=/usr/local/mysql-proxy/lib/mysql-proxy/lua/admin.lua
  • 查看启用的端口
    ]# netstat -tan | grep :40
    tcp        0      0 0.0.0.0:4040                0.0.0.0:*                   LISTEN      
    tcp        0      0 0.0.0.0:4041                 0.0.0.0:*                   LISTEN
    #4041是admin管理接口的端口,4040是mysql-proxy的端口

连接测试

  • 在代理服务器上(172.25.78.4)连接到管理接口查看有哪些后端服务器

    mysql -uadmin -padminpass -h172.25.78.4 --port=4041
    MySQL [(none)]> SELECT * FROM backends;
    +-------------+------------------+---------+------+------+-------------------+
    | backend_ndx | address          | state   | type | uuid | connected_clients |
    +-------------+------------------+---------+------+------+-------------------+
    |           1 | 172.25.78.2:3306 | unknown | rw   | NULL |                 0 |
    |           2 | 172.25.78.3:3306 | unknown | ro   | NULL |                 0 |
    +-------------+------------------+---------+------+------+-------------------+
  • 在master节点和slave节点上添加测试用户

    MariaDB [(none)]> GRANT SELECT,INSERT,UPDATE ON *.* TO 'test'@'172.25.78.%' IDENTIFIED BY 'testpass';
  • 在客户端进行测试

    ~]# mysql -utest -ptestpass -h172.25.78.4 -P4040
    MariaDB [(none)]> SHOW DATABASES;
    +--------------------+
    | Database           |
    +--------------------+
    | information_schema |
    | MYDB               |
    | S_SC_C             |
    | db_user            |
    | discuz             |
    | dvwa               |
    | hello              |
    | mysql              |
    | performance_schema |
    | test               |
    | testdb             |
    +--------------------+
    MariaDB [(none)]> USE S_SC_C;
    MariaDB [S_SC_C]> INSERT INTO S_1(sname,sdept) VALUES ('H','AA');
    MariaDB [S_SC_C]> SELECT * FROM S_1;
    +-----+-------+-------+
    | sid | sname | sdept |
    +-----+-------+-------+
    |   1 | HELLO | A     |
    |   2 | HE    | A     |
    |   3 | H     | AA    |
    +-----+-------+-------+
  • 在master上查看

    MariaDB [S_SC_C]> SELECT * FROM S_1;
    +-----+-------+-------+
    | sid | sname | sdept |
    +-----+-------+-------+
    |   1 | HELLO | A     |
    |   2 | HE    | A     |
    |   3 | H     | AA    |
    +-----+-------+-------+
  • 在slave上查看
    MariaDB [S_SC_C]> SELECT * FROM S_1;
    +-----+-------+-------+
    | sid | sname | sdept |
    +-----+-------+-------+
    |   1 | HELLO | A     |
    |   2 | HE    | A     |
    |   3 | H     | AA    |
    +-----+-------+-------+