Haproxy 为 mysql 做负载均衡

tar zxvf haproxy-1.4..tar.gz
cd haproxy-1.4.
uname -r

vim /etc/haproxy.cfg

global
        #日志
        log 127.0.0.1    local0
        maxconn
        chroot /tmp
        uid
        gid  

        daemon
        nbproc
        pidfile logs/haproxy.pid
        #debug
        #quiet
defaults
        log     127.0.0.1       local3
        mode    http
        #option  httplog
        #option  httpclose
        option  dontlognull
        #option  forwardfor
        option  redispatch
        retries
        maxconn
        contimeout
        clitimeout
        srvtimeout
        balance roundrobin
        bind-process
#监控状态页配置
listen stats
        mode http
        bind 0.0.0.0:
        stats enable
        stats   uri     /dbstat
        stats   realm Global\ statistics
        #身份验证
        stats auth admin:hello123

listen  mysql_proxy
        #代理端口
        bind 0.0.0.0:
        #模式 TCP
        mode tcp
        #调度算法
        balance roundrobin
        #mysql健康检查
        option mysql-check
        #健康检查加上check
        server  s1 192.168.1.42: weight  check port  inter 1s rise  fall
        server  s3 192.168.1.43: weight  check port  inter 1s rise  fall 

#启动服务
/usr/local/haproxy/sbin/haproxy -f /etc/haproxy.cfg
#杀掉服务
pkill haproxy

#启动脚本
vim /etc/init.d/haproxy

========================================
#! /bin/sh
set -e

PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/haproxy/sbin
PROGDIR=/usr/local/haproxy
PROGNAME=haproxy
DAEMON=$PROGDIR/sbin/$PROGNAME
CONFIG=/etc/haproxy.cfg
PIDFILE=$PROGDIR/logs/$PROGNAME.pid
DESC="HAProxy daemon"
SCRIPTNAME=/etc/init.d/$PROGNAME

# Gracefully exit if the package has been removed.
test -x $DAEMON || exit 

start()
{
        echo -n "Starting $DESC: $PROGNAME"
        $DAEMON -f $CONFIG
        echo "."
}

stop()
{
        echo -n "Stopping $DESC: $PROGNAME"
        haproxy_pid=cat $PIDFILE
        kill $haproxy_pid
        echo "."
}

restart()
{
        echo -n "Restarting $DESC: $PROGNAME"
        $DAEMON -f $CONFIG -p $PIDFILE -sf $(cat $PIDFILE)
        echo "."
}

case "$1" in
  start)
        start
        ;;
  stop)
        stop
        ;;
  restart)
        restart
        ;;
  *)
        echo "Usage: $SCRIPTNAME {start|stop|restart}" >&
        exit
        ;;
esac

exit
=================================================
chmod +x /etc/init.d/haproxy

#启动服务
/etc/init.d/haproxy start

参考：

http://www.2cto.com/database/201412/357835.html

http://blog.sina.com.cn/s/blog_5f66526e0100om1x.html