LAMP+redis搭建discuz论坛，基于mysql-proxy插件主从同步

测试环境：

MySQL-proxy   IP：192.168.72.134

MySQL-master  IP：192.168.72.128

MySQL-slave   IP：192.168.72.130

前提：MySQL主库与从库已经实现主从复制。

实现主从复制请参考我的前一篇博文：https://www.cnblogs.com/aqicheng/p/12186397.html

接下来的操作在proxy服务器上：

[root@SQL-proxy ~]# cd /usr/local/src/

[root@SQL-proxy src]# wgethttp://ftp.ntu.edu.tw/pub/MySQL/Downloads/MySQL-Proxy/mysql-proxy-0.8.5-linux-el6-x86-64bit.tar.gz


[root@SQL-proxy src]# ll -h

total 12M

-rw-r--r-- 1 root root 12M Aug 19  2014 mysql-proxy-0.8.5-linux-el6-x86-64bit.tar.gz

[root@SQL-proxy src]# tar zxf mysql-proxy-0.8.5-linux-el6-x86-64bit.tar.gz -C /usr/local/

[root@SQL-proxy src]# cd .. 

[root@SQL-proxy local]# mv mysql-proxy-0.8.5-linux-el6-x86-64bit/ mysql-proxy-0.8.5

[root@SQL-proxy local]# ll -d mysql-proxy-0.8.5

drwxr-xr-x  8 7161 wheel 4096 Aug 19  2014 mysql-proxy-0.8.5    # 看到所属用户和组有问题

[root@SQL-proxy local]# chown -R root:root mysql-proxy-0.8.5/  # 改为root

[root@SQL-proxy local]# ln -s mysql-proxy-0.8.5/ mysql-proxy    # 必备软连接

[root@SQL-proxy local]# cd mysql-proxy

[root@SQL-proxy mysql-proxy]# mkdir etc              # 创建 lua 脚本存放目录

[root@SQL-proxy mysql-proxy]# mkdir logs            # 创建日志目录

把实现读写分离的 lua 脚本复制到 etc 目录下

[root@SQL-proxy mysql-proxy]# cp share/doc/mysql-proxy/rw-splitting.lua etc/   

[root@SQL-proxy mysql-proxy]# cp share/doc/mysql-proxy/admin-sql.lua etc/

创建启动参数文件，启动服务时命令行就不用老长老长的。

[root@SQL-proxy ~]# vim /etc/mysql-proxy.cnf

[mysql-proxy]
user=root
admin-username=root
admin-password=123456
proxy-address=192.168.72.134

proxy-backend-addresses=192.168.72.139:3306
proxy-read-only-backend-addresses=192.168.72.130:3306

proxy-lua-script=/usr/local/src/mysql-proxy/etc/rw-splitting.lua

admin-lua-script=/usr/local/src/mysql-proxy/etc/admin-sql.lua
log-file=/usr/local/src/mysql-proxy/logs/mysql-proxy.log
log-level=info
daemon=true
keepalive=true

启动服务

[root@SQL-proxy ~]#  /usr/local/src/mysql-proxy/bin/mysql-proxy  --defaults-file=/etc/mysql-proxy.cnf

2017-04-24 16:40:19: (critical) mysql-proxy-cli.c:326: loading config from '/etc/mysql-proxy.cnf' failed: permissions of /etc/mysql-proxy.cnf aren't secure (0660 or stricter required)

2017-04-24 16:40:19: (message) Initiating shutdown, requested from mysql-proxy-cli.c:328

2017-04-24 16:40:19: (message) shutting down normally, exit code is: 1

！！看到无法启动，文件权限要改，因为文件里面有账号密码。

[root@SQL-proxy ~]# chmod 660 /etc/mysql-proxy.cnf     # 改权限

[root@SQL-proxy ~]# ll /etc/mysql-proxy.cnf 

-rw-rw---- 1 root root 432 Apr 24 16:31 /etc/mysql-proxy.cnf

[root@SQL-proxy ~]# /usr/local/mysql-proxy/bin/mysql-proxy --defaults-file=/etc/mysql-proxy.cnf                                              #  重新启动

[root@SQL-proxy ~]# netstat -lntup   # 查看服务

Active Internet connections (only servers)

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name   

tcp        0      0 192.168.0.86:3306           0.0.0.0:*                   LISTEN      3086/mysql-proxy 

老是命令行敲一长串命令肯定不科学了，直接上服务管理脚本。

[root@SQL-proxy ~]# 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


DEFAULT_FILE=/etc/mysql-proxy.cnf
PROXY_PID=/var/run/mysql-proxy.pid

RETVAL=0

start() {
    echo -n $"Starting MySQL-proxy...  : "
    daemon $prog --defaults-file=$DEFAULT_FILE
    RETVAL=$?
    echo
    if [ $RETVAL -eq 0 ]; then
        touch /var/lock/subsys/mysql-proxy.lock
    fi
}

stop() {
    echo -n $"Stopping MySQL-proxy...  : "
    killproc -p $PROXY_PID -d 3 $prog
    RETVAL=$?
    echo
    if [ $RETVAL -eq 0 ]; then
        rm -f /var/lock/subsys/mysql-proxy.lock
        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

[root@SQL-proxy ~]# chmod +x /etc/init.d/mysql-proxy   #  给执行权限

[root@SQL-proxy ~]# chkconfig mysql-proxy on           # 可以加入开机启动

测试一下脚本：

[root@SQL-proxy ~]# /etc/init.d/mysql-proxy status
mysql-proxy (pid  3086) is running...
[root@SQL-proxy ~]# 
[root@SQL-proxy ~]# /etc/init.d/mysql-proxy stop
Stopping MySQL-proxy...  :                                 [  OK  ]
[root@SQL-proxy ~]# 
[root@SQL-proxy ~]# /etc/init.d/mysql-proxy status
mysql-proxy is stopped
[root@SQL-proxy ~]# netstat -lntup
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      1079/sshd           
tcp        0      0 :::22                       :::*                        LISTEN      1079/sshd           
[root@SQL-proxy ~]# /etc/init.d/mysql-proxy start
Starting MySQL-proxy...  :                                 [  OK  ]
[root@SQL-proxy ~]# /etc/init.d/mysql-proxy restart
Stopping MySQL-proxy...  :                                 [  OK  ]
Starting MySQL-proxy...  :                                 [  OK  ]
[root@SQL-proxy ~]# 
[root@SQL-proxy ~]# netstat -lntup               
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name   
tcp        0      0 192.168.0.86:3306           0.0.0.0:*                   LISTEN      3143/mysql-proxy

以上MySQL-proxy服务器搭建完成，但是用于连接后端数据库的用户：proxy还需要在数据库端创建