前言:
MySQL读写分离是指让master处理写操作,让slave处理读操作,非常适用于读操作量比较大的场景,可减轻master的压力。使用mysql-proxy实现mysql的读写分离,mysql-proxy实际上是作为后端mysql主从服务器的代理,它直接接受客户端的请求,对SQL语句进行分析,判断出是读操作还是写操作,然后分发至对应的mysql服务器上。mysql-proxy是官方提供的mysql中间件产品可以实现负载平衡,读写分离,failover等MySQL Proxy就是这么一个中间层代理,简单的说,MySQL Proxy就是一个连接池,负责将前台应用的连接请求转发给后台的数据库,并且通过使用lua脚本,可以实现复杂的连接控制和过滤,从而实现读写分离和负载平衡。对于应用来说,MySQL Proxy是完全透明的,应用则只需要连接到MySQL Proxy的监听端口即可。当然,这样proxy机器可能成为单点失效,但完全可以使用多个proxy机器做为冗余,在应用服务器的连接池配置中配置到多 个proxy的连接参数即可。
实验系统:CentOS 6.6_x86_64
实验前提:防火墙和selinux都关闭
实验说明:本实验共有4台主机,IP分配如拓扑
实验软件:mariadb-10.0.20 mysql-proxy-0.8.5-linux-el6-x86-64bit
下载地址:http://pan.baidu.com/s/1i3F5Pop
实验拓扑:
一、准备工作:
1.将主机名称改为如下所示:
2.将hosts文件添加如下内容:
3.master、slave1和slave2安装mariadb:
tar xf mariadb-10.0.20-linux-x86_64.tar.gz -C /usr/local/ cd /usr/local/ ln -sv mariadb-10.0.20-linux-x86_64 mysql useradd -r mysql mkdir -pv /mydata/data chown -R mysql.mysql /mydata/data/ cd mysql/ chown -R root.mysql . scripts/mysql_install_db --user=mysql --datadir=/mydata/data/ cp support-files/my-large.cnf /etc/my.cnf cp support-files/mysql.server /etc/init.d/mysqld chkconfig --add mysqld chkconfig mysqld on
二、配置主从复制
1.master上配置my.cnf:
[mysqld] server-id = 1 datadir = /mydata/data log-bin = /mydata/data/master-bin binlog_format = ROW sync_binlog = 1 //确保每次事务提交之前都能将二进制日志同步磁盘上
2.slave1上配置my.cnf:
[mysqld] #log-bin=mysql-bin #binlog_format=mixed server-id = 2 datadir = /mydata/data relay_log = /mydata/data/relay-log read_only = 1 sync_master_info = 1 //及时同步master文件 sync_relay_log = 1 //及时同步relay-log文件 sync_relay_log_info = 1 //及时同步relay-log-info文件
3.slave2上配置my.cnf:
[mysqld] #log-bin=mysql-bin #binlog_format=mixed server-id = 3 datadir = /mydata/data relay_log = /mydata/data/relay-log read_only = 1 sync_master_info = 1 sync_relay_log = 1 sync_relay_log_info = 1
4.在master上创建复制用户:
service mysqld start /usr/local/mysql/bin/mysql -------------------------------------------> GRANT REPLICATION SLAVE,REPLICATION CLIENT ON *.* TO ‘slave‘@‘192.168.19.%‘ IDENTIFIED BY ‘123456‘; FLUSH PRIVILEGES;
5.在master上查看二进制日志位置:
SHOW MASTER LOGS;
6.两台slave上操作:
CHANGE MASTER TO MASTER_HOST=‘master‘,MASTER_USER=‘slave‘,MASTER_PASSWORD=‘123456‘,MASTER_LOG_FILE=‘master-bin.000001‘,MASTER_LOG_POS=637; START SLAVE; SHOW SLAVE STATUSG
三、安装mysql-proxy
1.此实验中19.79为mysql-proxy服务器,所以软件安装在此主机上:
tar xf mysql-proxy-0.8.5-linux-el6-x86-64bit.tar.gz -C /usr/local/ cd /usr/local/ ln -sv mysql-proxy-0.8.5-linux-el6-x86-64bit mysql-proxy useradd -r mysql-proxy
2.提供服务脚本:
vim /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="/usr/local/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="/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 $PROXY_OPTIONS --pid-file=$PROXY_PID --proxy-address="$PROXY_ADDRESS" --user=$PROXY_USER --admin-username="$ADMIN_USER" --admin-lua-script="$ADMIN_LUA_SCRIPT" --admin-password="$ADMIN_PASSWORD" RETVAL=$? 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
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chmod x /etc/init.d/mysql-proxy
chkconfig --add mysql-proxy
3.为服务脚本提供配置文件:
vim /etc/sysconfig/mysql-proxy ---------------------------------------------------------> # Options for mysql-proxy ADMIN_USER="admin" ADMIN_PASSWORD="admin" ADMIN_ADDRESS="" ADMIN_LUA_SCRIPT="/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua" PROXY_ADDRESS="" PROXY_USER="mysql-proxy" PROXY_OPTIONS="--daemon --log-level=info --log-use-syslog --plugins=proxy --plugins=admin --proxy-backend-addresses=192.168.19.66:3306 --proxy-read-only-backend-addresses=192.168.19.74:3306 --proxy-read-only-backend-addresses=192.168.19.76:3306 --proxy-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua"
//--daemon:以守护进程模式启动mysql-proxy
//--proxy-backend-addresses:后端可读写的mysql服务器的地址和端口
//--proxy-read-only-backend-addresses:后端只读mysql服务器的地址和端口
//--proxy-lua-script:完成mysql代理功能的Lua脚本
4.提供admin.lua文件:
vim /usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua
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