mysql-proxy读写分离

Posted 2020-07-12

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：

[[email protected]  tools]# groupadd -r -g 303 mysql-proxy
[[email protected]  tools]# useradd -g mysql -u 303 -r -s /sbin/nologin mysql-proxy

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

配置服务脚本：

[[email protected] 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

[[email protected] mysql-proxy]# chmod +x /etc/rc.d/init.d/mysql-proxy
[[email protected] mysql-proxy]# chkconfig --add mysql-proxy

为服务脚本提供配置文件/etc/mysql-proxy.cnf

[[email protected] ~]# 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：

[[email protected] 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。

[[email protected] 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：

[[email protected] 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  ]
[[email protected] 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：

[[email protected] ~]# 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：

[[email protected] mysql-proxy]# mysql -uadmin -p222222 -h192.168.1.222 --port=3307

over