mysql-proxy实现负载均衡及读写分离
mysql-proxy具有代理的功能,将客户端的mysql请求轮询至后台的mysql-server。
环境介绍:
一台mysql-proxy(178)
两台mysql-server(180,122)
一台mysql-client(254)
在mysql-proxy上安装如下包:
1.安装 pkg-config:(在RHEL6上默认已经安装,不需安装)
tar zxvf pkg-config-0.23.tar.gz
cd pkg-config-0.23
./configure
make
make install
确保 PKG_CONFIG_PATH 环境变量包含了相关的 pkg-config 配置文件路径:
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig
(如果是系统自带的pkg-config 则export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/lib/pkgconfig)
2.安装 libevent:
tar zxvf libevent-1.4.10-stable.tar.gz
cd libevent-1.4.10-stable
./configure
make
make install
3.安装 glib:
tar zxvf glib-2.20.0.tar.gz
cd glib-2.20.0
./configure
make
make install
4.安装 lua:
tar zxvf lua-5.1.4.tar.gz
cd lua-5.1.4
如果你的服务器是 64 位的,这时要调整一下 Makefile:vi src/Makefile,在 CFLAGS 里
加上-fPIC,否则会出错:
接下来不用执行常见的 configure,直接 make:
make linux
make install
5.安装 mysql-proxy:
安装 pkg-config 配置文件,以便编译 mysql-proxy 时能找到 lua:
cp etc/lua.pc /usr/local/lib/pkgconfig/lua.pc
如果没有执行此步骤的话,在编译安装 mysql-proxy 的时候,会得到类似下面的错误
信息:
Package lua5.1 was not found in the pkg-config search path.
Perhaps you should add the directory containing `lua5.1.pc'
to the PKG_CONFIG_PATH environment variable
No package 'lua5.1' found
tar zxvf mysql-proxy-0.7.0.tar.gz
cd mysql-proxy-0.7.0
./configure
make
make install
按照官方介绍做好启动脚本/etc/init.d/mysql-proxy
#!/bin/sh
#
# mysql-proxy This script starts and stops the mysql-proxy daemon
#
# chkconfig: - 78 30
# processname: mysql-proxy
# description: mysql-proxy is a proxy daemon to mysql
# Source function library.
. /etc/rc.d/init.d/functions
PROXY_PATH=/opt/mysql-proxy/sbin
prog="mysql-proxy"
# Source networking configuration.
. /etc/sysconfig/network
# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0
# Set default mysql-proxy configuration.
PROXY_OPTIONS="--daemon"
PROXY_PID=/var/run/mysql-proxy.pid
# Source mysql-proxy configuration.
if [ -f /etc/sysconfig/mysql-proxy ] ; then
. /etc/sysconfig/mysql-proxy
fi
PATH=$PATH:/usr/bin:/usr/local/bin:$PROXY_PATH
# By default it's all good
RETVAL=0
# See how we were called.
case "$1" in
start)
# Start daemon.
echo -n $"Starting $prog: "
daemon $NICELEVEL $PROXY_PATH/mysql-proxy $PROXY_OPTIONS --pid-file $PROXY_PID
RETVAL=$?
echo
if [ $RETVAL = 0 ]; then
touch /var/lock/subsys/mysql-proxy
fi
;;
stop)
# Stop daemons.
echo -n $"Stopping $prog: "
killproc $prog
RETVAL=$?
echo
if [ $RETVAL = 0 ]; then
rm -f /var/lock/subsys/mysql-proxy
rm -f $PROXY_PID
fi
;;
restart)
$0 stop
sleep 3
$0 start
;;
condrestart)
[ -e /var/lock/subsys/mysql-proxy ] && $0 restart
;;
status)
status mysql-proxy
RETVAL=$?
;;
*)
echo "Usage: $0 {start|stop|restart|status|condrestart}"
RETVAL=1
;;
esac
exit $RETVAL
chmod 755 /etc/init.d/mysql-proxy
chmod +x /etc/init.d/mysql-proxy
接下来要修改参数脚本/etc/sysconfig/mysql-proxy,在其中加入如下语句:
PROXY_OPTIONS="--proxy-backend-address=192.168.0.180:3306 --proxy-backend-addresses=192.168.0.122:3306 --daemon"
#service mysql-proxy start 会出现警告信息(ulimit -n 8192)
测试:
在 180上建数据库 DB1|t1|180
在 122上建数据库 DB1|t1|122
监听端口4040
设置grant语句
180>GRANT ALL PRIVILEGES on *.* to root@192.168.0.178 identified by '******'
122>GRANT ALL PRIVILEGES on *.* to root@192.168.0.178 identified by '******'
#iptables -I INPUT 1 -d 192.168.0.122/24 -p tcp --dport 3306 -j accept
#iptables -I INPUT 1 -d 192.168.0.180/24 -p tcp --dport 3306 -j accept
#mysql -uroot -p****** -P 4040 -h 192.168.0.178
测试时终端不要退,退了会看不出结果。(轮询)
二 读写分离
#mysql-proxy --help-all
查看得知 -b 可读写 -r 只读
在mysql-proxy源代码lib目录中 有读写分离脚本(rw-splitting.lua)
#cp rw-splitting.lua /usr/local/share 复制读写分离脚本到随便一个目录。
#vi /etc/sysconfig/mysql-proxy
PROXY_OPTIONS="-P 192.168.0.178:3306 -b 192.168.0.253 -r 192.168.0.252 -r 192.168.0.251 -r 192.168.0.250 -s /usr/local/share --daemon"
测试可以实现读写分离。
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