本篇是以MySql之主從複製爲基礎作的拓展mysql
在主從複製中,咱們設置了兩臺數據庫服務器(master,slave)linux
接下來咱們須要作到在master進行寫操做(insert,update,delete)
在slave上進行讀操做(select)sql
通常狀況下,會有多臺slave,由於數據庫的讀寫操做比基本是4:1
因此咱們使用多臺slave服務器來進行負載均衡,分擔數據庫的壓力數據庫
要完成讀寫分離,咱們還要繼續準備一臺數據庫服務器,做爲其集羣的中間件segmentfault
Mysql-Proxy是基於rw-splitting.lua實現的
首先安裝rw-splitting.lua:服務器
wget wget http://www.lua.org/ftp/lua-5.2.4.tar.gz tar zvfx lua-5.2.4.tar.gz cd lua-5.2.4
配置安裝文件:負載均衡
vi src/Makefile 找到 CFLAGS= -O2 -Wall (MYCFLAGS) 修改成: CFLAGS=−O2−Wall−fPIC (MYCFLAGS) :wq
安裝lua
make make install
配置系統變量:rest
cp etc/lua.pc /usr/lib/pkgconfig/ export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/lib/pkgconfig
下載地址:code
https://downloads.mysql.com/archives/proxy/
解壓安裝:
tar zxvf mysql-proxy-0.8.0-linux-rhel5-x86-32bit.tar.gz mv mysql-proxy-0.8.0-linux-rhel5-x86-32bit mysql-proxy
配置mysql-proxy
mkdir /mysql-proxy/init.d
cd /mysql-proxy/init.d
vi 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=/usr/local/bin PROXY_PATH=/opt/mysql-proxy/bin prog="mysql-proxy" # Source networking configuration. . /etc/sysconfig/network # Check that networking is up. [ ${NETWORKING} = "no" ] && exit 0 # Set default mysql-proxy configuration. #PROXY_OPTIONS="--daemon" PROXY_OPTIONS="--admin-username=root --admin-password=password --proxy-read-only-backend-addresses=192.168.10.131:3306 --proxy-backend-addresses=192.168.10.130:3306 --admin-lua-script=/opt/mysql-proxy/lib/mysql-proxy/lua/admin.lua --proxy-lua-script=/opt/mysql-proxy/scripts/rw-splitting.lua" PROXY_PID=/opt/mysql-proxy/run/mysql-proxy.pid # Source mysql-proxy configuration. if [ -f /etc/sysconfig/mysql-proxy ]; then . /etc/sysconfig/mysql-proxy fi PATH=$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: " NICELEVELNICELEVELPROXY_PATH/mysql-proxy $PROXY_OPTIONS --daemon --pid-file=$PROXY_PID --user=mysql --log-level=warning --log-file=/opt/mysql-proxy/log/mysql-proxy.log 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 +x /opt/mysql-proxy/init.d/mysql-proxy
mkdir /opt/mysql-proxy/run
mkdir /opt/mysql-proxy/log
mkdir /opt/mysql-proxy/scripts
拿到最新的rw-splitting.lua讀寫分離腳本
從https://downloads.mysql.com/archives/proxy/
下載最新的源碼包
解壓並cd到根目錄,把腳本考到咱們本地mysql-proxy的scripts文件夾下
cp lib/rw-splitting.lua /mysql-proxy/scripts
修改rw-splitting.lua:
vi /mysql-proxy/scripts/rw-splitting.lua
min_idle_connections = 1, //默認爲4 max_idle_connections = 1, //默認爲8
保存後啓動
/mysql-proxy/init.d/mysql-proxy start
以上即是MySql之讀寫分離