mysql-proxy读写分离

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下载地址：
MySQL-proxy-0.8.3-linux-glibc2.3-x86-64bit.tar.gz
http://downloads.mysql.com/archives/proxy/
添加用户：
[root@martin tools]# groupadd -r -g 303 mysql-proxy
[root@martin tools]# useradd -g mysql -u 303 -r -s /sbin/nologin mysql-proxy

[root@martin tools]# tar xf mysql-proxy-0.8.3-linux-glibc2.3-x86-64bit.tar.gz -C /usr/local/
[root@martin tools]# cd /usr/local/
[root@martin local]# ln -sv mysql-proxy-0.8.3-linux-glibc2.3-x86-64bit/ mysql-proxy

配置服务脚本：

[root@martin mysql-proxy]# vim /etc/rc.d/init.d/mysql-proxy
#!/bin/bash
#
# mysql-proxy This script starts and stops the mysql-proxy daemon
#
# chkconfig: – 78 30
# processname: mysql-proxy
# description: mysql-proxy is a proxy daemon for mysql
# Source function library.
. /etc/rc.d/init.d/functions
prog=”/usr/local/mysql-proxy/bin/mysql-proxy”
conf=”/etc/mysql-proxy.cnf”
PROXY_PID=”/var/run/mysql-proxy.pid”

# Check that networking is up.
[${NETWORKING} = “no” ] && exit 0
# Set default mysql-proxy configuration.
ADMIN_USER=”admin”
ADMIN_PASSWD=”admin”
ADMIN_LUA_SCRIPT=”/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua”
PROXY_OPTIONS=”–daemon”
PROXY_PID=/var/run/mysql-proxy.pid
PROXY_USER=”mysql-proxy”
# Source mysql-proxy configuration.
if [-f /etc/sysconfig/mysql-proxy]; then
. /etc/sysconfig/mysql-proxy
fi
RETVAL=0
start() {

echo -n $”Starting $prog: “
daemon $prog –defaults-file=$conf &>/dev/null
RETVAL=$?
if [$RETVAL -eq 0]; then
touch /var/lock/subsys/mysql-proxy
success
echo -e “\r”
fi
}
stop() {
echo -n $”Stopping $prog: “
killproc -p $PROXY_PID -d 3 $prog
RETVAL=$?
echo
if [$RETVAL -eq 0]; then
rm -f /var/lock/subsys/mysql-proxy
rm -f $PROXY_PID
fi
}
# See how we were called.
case “$1” in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
condrestart|try-restart)
if status -p $PROXY_PIDFILE $prog >&/dev/null; then
stop
start
fi
;;
status)
status -p $PROXY_PID $prog
;;
*)
echo “Usage: $0 {start|stop|restart|reload|status|condrestart|try-restart}”
RETVAL=1
;;
esac
exit $RETVAL

[root@martin mysql-proxy]# chmod +x /etc/rc.d/init.d/mysql-proxy
[root@martin mysql-proxy]# chkconfig –add mysql-proxy

为服务脚本提供配置文件 /etc/mysql-proxy.cnf

[root@martin ~]# vim /etc/mysql-proxy.cnf
[mysql-proxy]
daemon = true #以守护进程模式启动 mysql-proxy
pid-file = /var/run/mysql-proxy.pid
log-level = info #日志级别
plugins = admin,proxy #在 mysql-proxy 启动时加载的插件；
user = mysql-proxy #运行 mysql-proxy 进程的用户；
#
#Proxy Configuration
proxy-address = 0.0.0.0:3307 #代理服务监听的地址和端口；
proxy-backend-addresses = 192.168.1.222:3306# 后端 mysql 服务器的地址和端口一般是主服务器；
proxy-read-only-backend-addresses = 192.168.1.223:3306#从服务器
proxy-lua-script = /usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua#完成 mysql 代理功能的 Lua 脚本
#proxy-skip-profiling = true # 禁用 profile
#
# Admin Configuration
admin-address = 0.0.0.0:4042 #管理模块监听的地址和端口
admin-lua-script = /usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua
admin-username = admin#管理模块用户
admin-password = admin#管理模块密码

修改权限：
1 [root@martin mysql-proxy]# chmod 660 /etc/mysql-proxy.cnf

复制如下内容建立 admin.lua 文件，将其保存至 /usr/local/mysql-proxy/share/doc/mysql-proxy/ 目录中。
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103 [root@martin mysql-proxy]# vim /usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua

–[[$%BEGINLICENSE%$
Copyright (c) 2007, 2012, Oracle and/or its affiliates. All rights reserved.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; version 2 of the
License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA

$%ENDLICENSE%$ –]]

function set_error(errmsg)
proxy.response = {
type = proxy.MYSQLD_PACKET_ERR,
errmsg = errmsg or “error”
}
end

function read_query(packet)
if packet:byte() ~= proxy.COM_QUERY then
set_error(“[admin] we only handle text-based queries (COM_QUERY)”)
return proxy.PROXY_SEND_RESULT
end

local query = packet:sub(2)

local rows = {}
local fields = {}

if query:lower() == “select * from backends” then
fields = {
{name = “backend_ndx”,
type = proxy.MYSQL_TYPE_LONG },

{name = “address”,
type = proxy.MYSQL_TYPE_STRING },
{name = “state”,
type = proxy.MYSQL_TYPE_STRING },
{name = “type”,
type = proxy.MYSQL_TYPE_STRING },
{name = “uuid”,
type = proxy.MYSQL_TYPE_STRING },
{name = “connected_clients”,
type = proxy.MYSQL_TYPE_LONG },
}

for i = 1, #proxy.global.backends do
local states = {
“unknown”,
“up”,
“down”
}
local types = {
“unknown”,
“rw”,
“ro”
}
local b = proxy.global.backends[i]

rows[#rows + 1] = {
i,
b.dst.name, — configured backend address
states[b.state + 1], — the C-id is pushed down starting at 0
types[b.type + 1], — the C-id is pushed down starting at 0
b.uuid, — the MySQL Server’s UUID if it is managed
b.connected_clients — currently connected clients
}
end
elseif query:lower() == “select * from help” then
fields = {
{name = “command”,
type = proxy.MYSQL_TYPE_STRING },
{name = “description”,
type = proxy.MYSQL_TYPE_STRING },
}
rows[#rows + 1] = {“SELECT * FROM help”, “shows this help”}
rows[#rows + 1] = {“SELECT * FROM backends”, “lists the backends and their state”}
else
set_error(“use ‘SELECT * FROM help’ to see the supported commands”)
return proxy.PROXY_SEND_RESULT
end

proxy.response = {
type = proxy.MYSQLD_PACKET_OK,
resultset = {
fields = fields,
rows = rows
}
}
return proxy.PROXY_SEND_RESULT
end

启动脚本：
[root@martin mysql-proxy]# /etc/init.d/mysql-proxy restart
Stopping /usr/local/mysql-proxy/bin/mysql-proxy: [OK]
Starting /usr/local/mysql-proxy/bin/mysql-proxy: [OK]
[root@martin mysql-proxy]# ss -lntup|grep mysql-proxy
tcp LISTEN 0 128 *:3307 *:* users:((“mysql-proxy”,111652,10))
tcp LISTEN 0 128 *:4042 *:* users:((“mysql-proxy”,111652,9))

主服务器创建代理账号：
mysql> grant all on *.* to ‘admin’@’192.168.1.%’ identified by ‘222222’;
mysql> flush privileges;

查看代理信息：
[root@martin ~]# mysql -uadmin -padmin -h192.168.1.222 –port=4042

mysql> SELECT * FROM backends;
+————-+——————–+———+——+——+——————-+

| backend_ndx | address | state | type | uuid | connected_clients |

+————-+——————–+———+——+——+——————-+

| 1 | 192.168.1.222:3306 | up | rw | NULL | 0 |

| 2 | 192.168.1.223:3306 | unknown | ro | NULL | 0 |

+————-+——————–+———+——+——+——————-+

登入代理：
[root@martin mysql-proxy]# mysql -uadmin -p222222 -h192.168.1.222 –port=3307

over

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