haproxy实现mysql双主高可用的详细过程

一、安装haproxy

1.找到haproxy的包

http://pkgs.fedoraproject.org/repo/pkgs/haproxy/haproxy-1.7.9.tar.gz

也可以直接用yum安装

yum install -y haproxy

2.解压

tar zxf haproxy-1.7.9.tar.gz

3.编译安装

cd haproxy-1.7.9

make TARGET=linux2628 ARCH=x86_64 PREFIX=/usr/local/haproxy
make install PREFIX=/usr/local/haproxy

#参数说明
TARGET=linux26 #内核版本，使用uname -r查看内核，如：2.6.18-371.el5，此时该参数就为linux26；kernel 大于2.6.28的用：TARGET=linux2628
ARCH=x86_64 #系统位数
PREFIX=/usr/local/haprpxy #/usr/local/haprpxy为haprpxy安装路径

4.编辑启动脚本（自己创建）

vi /etc/init.d/haproxy

#!/bin/sh
#
# haproxy
#
# chkconfig:   - 85 15
# description:  HAProxy is a free, very fast and reliable solution \
#               offering high availability, load balancing, and \
#               proxying for TCP and  HTTP-based applications
# processname: haproxy
# config:      /etc/haproxy/haproxy.cfg
# pidfile:     /var/run/haproxy.pid# Source function library.
. /etc/rc.d/init.d/functions# Source networking configuration.
. /etc/sysconfig/network# Check that networking is up.
[ "$NETWORKING" = "no" ] && exit 0exec="/usr/sbin/haproxy"
prog=$(basename $exec)[ -e /etc/sysconfig/$prog ] && . /etc/sysconfig/$progcfgfile=/etc/haproxy/haproxy.cfg
pidfile=/var/run/haproxy.pid
lockfile=/var/lock/subsys/haproxycheck() {$exec -c -V -f $cfgfile $OPTIONS
}start() {$exec -c -q -f $cfgfile $OPTIONSif [ $? -ne 0 ]; thenecho "Errors in configuration file, check with $prog check."return 1fiecho -n $"Starting $prog: "# start it up here, usually something like "daemon $exec"daemon $exec -D -f $cfgfile -p $pidfile $OPTIONSretval=$?echo[ $retval -eq 0 ] && touch $lockfilereturn $retval
}stop() {echo -n $"Stopping $prog: "# stop it here, often "killproc $prog"killproc $progretval=$?echo[ $retval -eq 0 ] && rm -f $lockfilereturn $retval
}restart() {$exec -c -q -f $cfgfile $OPTIONSif [ $? -ne 0 ]; thenecho "Errors in configuration file, check with $prog check."return 1fistopstart
}reload() {$exec -c -q -f $cfgfile $OPTIONSif [ $? -ne 0 ]; thenecho "Errors in configuration file, check with $prog check."return 1fiecho -n $"Reloading $prog: "$exec -D -f $cfgfile -p $pidfile $OPTIONS -sf $(cat $pidfile)retval=$?echoreturn $retval
}force_reload() {restart
}fdr_status() {status $prog
}case "$1" instart|stop|restart|reload)$1;;force-reload)force_reload;;check)check;;status)fdr_status;;condrestart|try-restart)[ ! -f $lockfile ] || restart;;*)echo $"Usage: $0 {start|stop|status|restart|try-restart|reload|force-reload}"exit 2
esac

5.加入自启动

chkconfig --add haproxy

chkconfig haproxy on

chmod +x /etc/init.d/haproxy

二、配置haproxy

1.新建目录和用户

mkdir /etc/haproxy

mkdir /var/lib/haproxy

useradd -r haproxy

2.编辑配置文件

vi /etc/haproxy/haproxy.cfg

globallog         127.0.0.1 local2chroot      /var/lib/haproxypidfile     /var/run/haproxy.pidmaxconn     4000user        haproxygroup       haproxydaemonstats socket /var/lib/haproxy/statsdefaultslog     globallog 127.0.0.1 local3mode    httpoption  tcplogoption  dontlognullretries 10option redispatchmaxconn         2000timeout connect         10stimeout client          1mtimeout server          1mtimeout http-keep-alive 10stimeout check           10slisten  mysqlbind 0.0.0.0:7306mode tcpbalance roundrobinserver mysql1 192.168.1.78:3306server mysql2 192.168.1.77:3306listen statsbind 0.0.0.0:1080mode httpoption httplogmaxconn 10stats refresh 30sstats uri /statsstats realm XingCloud\ Haproxystats auth admin:admin #用这个账号登录，可以自己设置stats auth Frank:Frankstats hide-versionstats admin if TRUE

3.配置日志

(1).vim /etc/rsyslog.conf

# Provides UDP syslog reception #去掉下面两行注释，开启UDP监听

$ModLoad imudp

$UDPServerRun 514

local2.* /var/log/haproxy.log #添加日志

(2).vi /etc/sysconfig/rsyslog

SYSLOGD_OPTIONS=""

改为 SYSLOGD_OPTIONS="-r -m 2 -c 2"

(3).创建日志文件

touch /var/log/haproxy.log

4.启动日志和haproxy

service haproxy start

service rsyslog restart

netstat -plantu | grep 7306 --查看端口7306

三、测试haproxy是否成功

1.在两台数据库添加权限

GRANT ALL ON *.* TO 'haproxy'@'192.168.1.%' IDENTIFIED BY '123456';

FLUSH PRIVILEGES;

2.在haproxy这台服务器远程登录到mysql服务器，测试

yum install -y mysql (若没有mysql客户端，安装)

mysql -uhaproxy -p123456 -h 192.168.1.78

mysql -uhaproxy -p123456 -h 192.168.1.77

3.测试haproxy

在其他的服务器上输入(haproxy的服务器地址192.168.88)：

mysql -uhaproxy -p123456 -h 192.168.88 -P 7306

是否能连接到数据库

7306是在配置文件中设置的端口，通过haproxy的7306端口访问mysql的3306端口

4.页面访问

浏览器输入http://192.168.1.88:1080/stats

出现下图所示：

证明成功。