mysql-proxy实现读写分离：

一：mysql主从数据库的配置
要求：配置主

从复制： server2 主 172.25.28.2
server3 从 172.25.28.3
二：安装配置mysql-proxy

[root@server1 /]# tar zxf mysql-proxy-0.8.5-linux-el6-x86-64bit -C /usr/local/

[root@server1 local]# ln -s mysql-proxy-0.8.5-linux-el6-x86-64bit/ mysql-proxy  ##简化路径

[root@server1 local]# mkdir /usr/local/mysql-proxy/conf[root@server1 local]# mkdir /usr/local/mysql-proxy/log

[root@server1 local]# vim mysql-proxy/conf/mysql-proxy.conf ##编译配置文件

[mysql-proxy]daemon=true   #打入后台user=root     #keepalive=trueplugins=proxy,adminlog-level=info    #日志级别log-file=/usr/local/mysql-proxy/log/mysql-proxy.log  ##proxy日志地址proxy-address=172.25.28.1:3306  #本机ip地址      proxy-backend-addresses=172.25.28.2:3306  ##backend主   注意addressesproxy-read-only-backend-addresses=172.25.28.3:3306  ##backend从proxy-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua    ##lua脚本地址admin-address=172.25.28.1:4041   ##proxy的管理用户adminiphe端口admin-username=adminadmin-password=westosadmin-lua-script=/usr/local/mysql-proxy/lib/mysql-proxy/lua/admin.lua   #admin的lua脚本地址；

更改lua脚本
[root@server1 local]# vim /usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua
使其快速进入读写分离状态

-- connection poolif not proxy.global.config.rwsplit then        proxy.global.config.rwsplit = {                min_idle_connections = 1,  ##最小连接数                max_idle_connections = 2,  ##最大连接数后实现读写分离                is_debug = false        }

开启proxy控制

[root@server1 local]# /usr/local/mysql-proxy/bin/mysql-proxy --defaults-file=/usr/local/mysql-proxy/conf/mysql-proxy.conf

查看日志状态：

[root@server1 mysql-proxy]#  /usr/local/mysql-proxy/bin/mysql-proxy --defaults-file=/usr/local/mysql-proxy/conf/mysql-proxy.conf[root@server1 mysql-proxy]#cat  log/mysql-proxy.log2017-10-21 13:15:54: (message) chassis-unix-daemon.c:136: [angel] we try to keep PID=1409 alive2017-10-21 13:15:54: (critical) plugin proxy 0.8.5 started2017-10-21 13:15:54: (critical) plugin admin 0.8.5 started2017-10-21 13:15:54: (critical) network-socket.c:492: bind(172.25.28.1:3306) failed: Address already in use (98)2017-10-21 13:15:54: (critical) chassis-mainloop.c:270: applying config of plugin proxy failed2017-10-21 13:15:54: (critical) mysql-proxy-cli.c:599: Failure from chassis_mainloop. Shutting down.2017-10-21 13:15:54: (message) Initiating shutdown, requested from mysql-proxy-cli.c:6002017-10-21 13:15:54: (message) shutting down normally, exit code is: 12017-10-21 13:15:54: (critical) chassis-unix-daemon.c:189: [angel] PID=1380 died on signal=11 (it used 2 kBytes max) ... waiting 3min before restart2017-10-21 13:15:54: (message) chassis-unix-daemon.c:176: [angel] PID=1409 exited normally with exit-code = 1 (it used 1 kBytes max)2017-10-21 13:15:54: (message) Initiating shutdown, requested from mysql-proxy-cli.c:2732017-10-21 13:15:54: (message) shutting down normally, exit code is: 12017-10-21 13:15:56: (message) chassis-unix-daemon.c:136: [angel] we try to keep PID=1410 alive2017-10-21 13:15:56: (critical) plugin proxy 0.8.5 started2017-10-21 13:15:56: (critical) plugin admin 0.8.5 started2017-10-21 13:15:56: (message) proxy listening on port 172.25.28.1:33062017-10-21 13:15:56: (message) added read/write backend: 172.25.28.2:33062017-10-21 13:15:56: (message) added read-only backend: 172.25.28.3:33062017-10-21 13:15:56: (message) admin-server listening on port 172.25.28.1:4041[root@server1 mysql-proxy]# 

根据日志可以查看已经控制到mysql

过滤端口：

[root@server1 mysql-proxy]# netstat -anltpActive Internet connections (servers and established)Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name   tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      936/sshd            tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN      1012/master         tcp        0      0 172.25.28.1:4041            0.0.0.0:*                   LISTEN      1410/mysql-proxy    tcp        0      0 172.25.28.1:3306            0.0.0.0:*                   LISTEN      1410/mysql-proxy    tcp        0      0 172.25.28.1:53135           172.25.28.2:3306            TIME_WAIT   -                   tcp        0      0 172.25.28.1:22              172.25.28.250:55476         ESTABLISHED 1072/sshd           tcp        0      0 172.25.28.1:53137           172.25.28.2:3306            TIME_WAIT   -                   tcp        0      0 :::22                       :::*                        LISTEN      936/sshd            tcp        0      0 ::1:25                      :::*                        LISTEN      1012/master         

z在master（server1）端给zpy用户权限：

mysql> grant all on test.* to zpy@'%' identified by 'zpy';Query OK, 0 rows affected (0.00 sec)

下来我们开始检测：
在mysql安装lsof：

[root@server2 ~]# yum install -y lsof

重新开一台设备：

[root@foundation28 mysql10.21]# mysql -h 172.25.28.1 -u zpy -p   ##通过访问proxy，直接转到mysqlEnter password: Welcome to the MariaDB monitor.  Commands end with ; or \g.Your MySQL connection id is 8Server version: 5.1.71-log Source distributionCopyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

如上每登陆一次，使用lsof观察3306 端口，连接一次

[root@server2 ~]# lsof -i :3306COMMAND  PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAMEmysqld  1411 mysql   11u  IPv4   9514      0t0  TCP *:mysql (LISTEN)mysqld  1411 mysql   31u  IPv4  10201      0t0  TCP 172.25.28.2:mysql->172.25.28.1:53132 (ESTABLISHED)

当连接数大于2（lua脚本中设置的时）；即启动了读写分离机制：
我们可以登陆admin p’roxy管理用户查看：

[root@foundation28 mysql10.21]# mysql -h 172.25.28.1 -u admin -pwestos -P 4041;Welcome to the MariaDB monitor.  Commands end with ; or \g.Your MySQL connection id is 1Server version: 5.0.99-agent-adminCopyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.MySQL [(none)]> select * from backends;+-------------+------------------+---------+------+------+-------------------+| backend_ndx | address          | state   | type | uuid | connected_clients |+-------------+------------------+---------+------+------+-------------------+|           1 | 172.25.28.2:3306 | up      | rw   | NULL |                 0 ||           2 | 172.25.28.3:3306 | unknown | ro   | NULL |                 0 |+-------------+------------------+---------+------+------+-------------------+2 rows in set (0.00 sec)MySQL [(none)]> Bye[root@foundation28 mysql10.21]# 

当然我们也可以使用上一篇所用的关闭I/O线程，然后写入数据最后在两端查看不同；；