实验拓扑图:
实验环境说明:MySQL主从已经部署完成,并且授权mysql-proxy主机数据库权限
系统 centos 6.4 _ x86_64
192.168.0.101 mysql-proxy
192.168.0.102 mysql-master
192.168.0.103 mysql-slave
部署开始:
检查依赖包
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[root@shell tools] # rpm -q lua
lua-5.1.4-4.1.el6.x86_64
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2.下载通用的压缩包 mysql-proxy-0.8.4-linux-glibc2.3-x86-64bit.tar.gz 直接解压使用
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useradd
-r mysql-proxy
wget http: //cdn .mysql.com /Downloads/MySQL-Proxy/mysql-proxy-0 .8.4-linux-glibc2.3-x86-64bit. tar .gz
tar
zxf mysql-proxy-0.8.4-linux-glibc2.3-x86-64bit. tar .gz -C /application
ln
-s /application/mysql-proxy-0 .8.4-linux-glibc2.3-x86-64bit /application/mysql-proxy
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3.环境变量配置
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echo
"export PATH=/application/mysql-proxy/bin:$PATH"
>> /etc/profile
source
/etc/profile
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4.启动mysql-proxy
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[root@mysql-proxy ~] # mysql-proxy --daemon --log-level=debug --log-file=/var/log/mysql-proxy.log --plugins=proxy --proxy-backend-addresses="192.168.0.102:3306" --proxy-read-only-backend-addresses="192.168.0.103:3306" --proxy-lua-script="/application/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua"
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5.检查启动结果
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[root@mysql-proxy lib] # netstat -nltp
Active Internet connections (only servers)
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 971 /sshd
tcp 0 0 0.0.0.0:4040 0.0.0.0:* LISTEN 1274 /mysql-proxy
tcp 0 0 :::22
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# 此时只能实现简单的读写分离
# 添加启动脚本和管理查询模块
6.为mysql-proxy服务脚本提供配置文件/etc/sysconfig/mysql-proxy
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# Options for mysql-proxy
ADMIN_USER= "admin"
ADMIN_PASSWORD= "admin"
ADMIN_ADDRESS= ""
#ADMIN_ADDRESS="0.0.0.0:4040"
ADMIN_LUA_SCRIPT= "/application/mysql-proxy/share/doc/mysql-proxy/admin.lua"
PROXY_ADDRESS= ""
PROXY_USER= "mysql-proxy"
#PROXY_OPTIONS="--daemon --log-level=info --log-use-syslog"
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7.编辑mysql-proxy依赖的admin.lua脚本
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cat
>> /application/mysql-proxy/share/doc/mysql-proxy/admin .lua <<EOF
--[[ $%BEGINLICENSE%$
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
EOF
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8. 编辑mysql-proxy启动脚本
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cat
>> /etc/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= "/application/mysql-proxy/bin/mysql-proxy"
# Source networking configuration.
if
[ -f /etc/sysconfig/network
]; then
. /etc/sysconfig/network
fi
# Check that networking is up.
[ ${NETWORKING} = "no"
] && exit
0
# Set default mysql-proxy configuration.
ADMIN_USER= "admin"
ADMIN_PASSWD= "admin"
ADMIN_LUA_SCRIPT= "/application/mysql-proxy/share/doc/mysql-proxy/admin.lua"
PROXY_OPTIONS= "--daemon --log-level=debug --log-file=/var/log/mysql-proxy.log --plugins=proxy --plugins=admin --proxy-backend-addresses=192.168.0.102:3306 --proxy-read-only-backend-addresses=192.168.0.103:3306"
PROXY_PID= /var/run/mysql-proxy .pid
PROXY_USER= "mysql-proxy"
PROXY_LUA= "/application/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua"
# 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 $PROXY_OPTIONS --pid- file =$PROXY_PID --proxy-address= "$PROXY_ADDRESS"
--user=$PROXY_USER --admin-username= "$ADMIN_USER"
--admin-lua-script= "$ADMIN_LUA_SCRIPT"
--admin-password="$ADMIN_PASSWO
RD"
RETVAL=$?
echo
if
[ $RETVAL - eq
0 ]; then
touch
/var/lock/subsys/mysql-proxy
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
EOF
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chmod 700 /etc/init.d/mysql-proxy
9. 重启mysql-proxy
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/etc/init .d /mysql-proxy
restart
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10.检查启动结果
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[root@mysql-proxy application] # netstat -nltpo
Active Internet connections (only servers)
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 971 /sshd
tcp 0 0 0.0.0.0:4040 0.0.0.0:* LISTEN 1396 /mysql-proxy
tcp 0 0 0.0.0.0:4041 0.0.0.0:* LISTEN 1396 /mysql-proxy
tcp 0 0 :::22 :::* LISTEN 971 /sshd
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说明: 4040 是mysql-proxy 本身监听的端口
4040 是mysql-proxy 管理模块监听的端口
11.此时登陆管理模块,查看后端状态
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mysql -uroot -P 4040 -p -h192.168.0.101 -e "select user,host from mysql.user"
mysql> select
* from backends;
+-------------+--------------------+---------+------+------+-------------------+
| backend_ndx | address | state | type
| uuid | connected_clients |
+-------------+--------------------+---------+------+------+-------------------+
| 1 | 192.168.0.102:3306 | unknown | rw | NULL | 0 |
| 2 | 192.168.0.103:3306 | unknown | ro | NULL | 0 |
+-------------+--------------------+---------+------+------+-------------------+
2 rows in
set
(0.00 sec)
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#由于此时没有进行任何操作,所以主从状态都是unknown
12.执行查询操作,查看主从状态变化
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mysql -uroot -P 4040 -p -h192.168.0.101 -e "show databases;"
mysql> select
* from backends;
+-------------+--------------------+---------+------+------+-------------------+
| backend_ndx | address | state | type
| uuid | connected_clients |
+-------------+--------------------+---------+------+------+-------------------+
| 1 | 192.168.0.102:3306 | up | rw | NULL | 0 |
| 2 | 192.168.0.103:3306 | unknown | ro | NULL | 0 |
+-------------+--------------------+---------+------+------+-------------------+
2 rows in
set
(0.00 sec)
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# 由于主是支持读写的,所以发现主状态变为了up是正常现象,要想观看到从的状态,需要多次查询
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mysql -uroot -P 4040 -p -h192.168.0.101 -e "select user,host from mysql.user"
mysql> select
* from backends;
+-------------+--------------------+-------+------+------+-------------------+
| backend_ndx | address | state | type
| uuid | connected_clients |
+-------------+--------------------+-------+------+------+-------------------+
| 1 | 192.168.0.102:3306 | up | rw | NULL | 0 |
| 2 | 192.168.0.103:3306 | up | ro | NULL | 0 |
+-------------+--------------------+-------+------+------+-------------------+
2 rows in
set
(0.00 sec)
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#此时发现主从状态全部变成了up状态