#!/bin/bash
#
#chkconfig: 2345 94 06
#
. /etc/rc.d/init.d/functions
#加载脚本配置文件，提供变量值
if [ -e /usr/mysql-proxy.conf ] ; then
. /usr/mysql-proxy.conf
fi
#查看是否安装mysql-proxy软件
if ! `cd /usr/local/mysql-proxy > /dev/null` ; then
tar xf /root/$VER -C /usr/local/
ln -s /usr/local/mysql-proxy-0.8.5-linux-glibc2.3-x86-32bit /usr/local/mysql-proxy
fi
start() {
/usr/local/mysql-proxy/bin/mysql-proxy --daemon --log-level=$LOGLEVEL --log-file="$LOGFILE" --plugins=‘proxy‘ --proxy-backend-addresses="$MASTERADDR" --proxy-read-only-backend-addresses="$SLAVEADDR" --proxy-lua-script=‘$PROXYLUA‘ --plugins=‘admin‘ --admin-username="$ADMINUSER" --admin-password="$PASSWD" --admin-lua-script="$ADMINLUA"
}
stop() {
killall mysql-proxy
}
#查看代理运行状态时，需保证本机装有mysql客户端程序
status() {
mysql -u$ADMINUSER -h$PROXYADDR -p$PASSWD --port=$ADMINPORT -e"select * from backends"
}
test() {
if `netstat -ntpl | grep ‘mysql-proxy‘ > /dev/null` ; then
STAT=OK
else
STAT=FAULT
fi
}
case $1 in
start)
start
test
echo "Start mysql-proxy...[$STAT]"
;;
stop)
stop
echo "stop mysql-proxy...[OK]"
;;
restart)
stop
echo "stop mysql-proxy...[OK]"
start
test
echo "Start mysql-proxy...[$STAT]"
;;
status)
status
;;
*|help)
echo "Usage:$0 {start|stop|restart|status|help]"
;;
esac需要加载的配置文件，提供变量值
VER="mysql-proxy-0.8.5-linux-glibc2.3-x86-32bit.tar.gz"
LOGLEVEL="info"
LOGFILE="/var/log/mysql-proxy.log"
MASTERADDR="192.168.1.51:3306"
SLAVEADDR="192.168.1.53:3306"
PROXYLUA="/usr/local/mysql-proxy/share/doc/mysql-proxy/rm-splitting.lua"
ADMINUSER="admin"
PASSWD="admin"
ADMINLUA="/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua"
PROXYADDR=‘192.168.1.54‘
PROXYPORT=4040
ADMINPORT=4041
admin.lua脚本
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
原文地址：http://10900996.blog.51cto.com/10890996/1795254
