HaProxy+keepalived+mycat集群实战 2、haproxy记录日志，默认haproxy是不记录日志的，为了记录日志还需要配置syslog模块，在linux下是rsyslogd服务， #yum –y installrsyslog先安装rsyslog

集群部署图的理解：

1、  keepalive和haproxy必须装在同一台机器上，keepalived负责为该服务器抢占VIP。

2、  192.168.1.107上的keepalived会抢占VIP，抢占VIP有优先级，配置keepalived.conf中参数priority值越大优先越高，在同等情况下，keepalived服务器启动先得会先抢到VIP。

3、  Harpoxy负责将对VIP的请求分发到mycat上，起到负载均衡的作用，同时haproxy也能检测到mycat是否存活，haproxy只会将请求转发到存活的mycat上。

4、  如果一台服务器（keepalive+mycat）宕机，另外一台上的keepalived会立刻抢占vip并接管服务，如果一台mycat服务器宕机，haproxy转发时候不会转发到宕机的mycat上.

keepalived的安装配置：

两台机器进行keepalived安装，个别参数区别其他一致。

1、      安装：

#tar -zxvf  keepalived-1.2.19.tar.gz

# cd keepalived-1.2.19 &amp;&amp;<code>./configure --prefix=/usr/local/keepalived &amp;&amp;make&amp;&amp; make install</code>

<code>不报错，表示ok，有些系统可能需要安装gcc这个依赖包</code>

<code>Yum –y install gcc</code>

<code>2、    </code><code>配置</code>

<code>cp</code> <code>/usr/local/keepalived/sbin/keepalived </code> <code>/usr/sbin/</code>

cp /usr/local/keepalived/etc/sysconfig/keepalived  /etc/sysconfig/

cp /usr/local/keepalived/etc/rc.d/init.d/keepalived/etc/init.d/

<code>mkdir</code> <code>/etc/keepalived&amp;&amp; cd</code> <code>/etc/keepalived/</code>

cp /usr/local/keepalived/etc/keepalived/keepalived.conf/etc/keepalived

mkdir-p /usr/local/keepalived/var/log

vi/etc/keepalived/keepalived.conf ####Master

! Configuration File for keepalived

global_defs {

  notification_email {

    [email protected]

    [email protected]

    [email protected]

   }

  notification_email_from [email protected]

   smtp_server192.168.200.1

  smtp_connect_timeout 30

   router_idLVS_DEVEL

}

vrrp_instance VI_1 {

    state MASTER  ##把MASTER改成BACKUP

    interface eth1   #和本机网卡接口名一致

   virtual_router_id 51

    priority 100    ###权重 ,SLAVE点改小于100就好

    advert_int 1

    authentication{

        auth_typePASS

        auth_pass1111

    }

   virtual_ipaddress {

        192.168.1.219 dev eth1 scope global

notify_master /etc/keepalived/scripts/haproxy_master.sh

notify_backup /etc/keepalived/scripts/haproxy_backup.sh

notify_fault /etc/keepalived/scripts/haproxy_fault.sh

notify_stop /etc/keepalived/scripts/haproxy_stop.sh

###到这里可以测试下VIP的漂移功能。

二、安装HAPROXY

1、安装HAPROXY：

#useradd  haproxy

tar -zxvfhaproxy-1.4.20.tar.gz

cdhaproxy-1.4.20 &amp;&amp; make TARGET=linux26 PREFIX=/usr/local/haproxyARCH=X86_64 &amp;&amp; make install PREFIX=/usr/local/haproxy

chown –R  haproxy.haproxy /usr/local/haprox

cd /usr/local/haproxy

编辑配置文件haproxy.cfg，以提供，修改内容即可

若yum安装rsyslog 有这样问题：

<a href="http://s4.51cto.com/wyfs02/M01/89/93/wKioL1gXXAPi9kPFAABxhJs4tOA997.png-wh_500x0-wm_3-wmp_4-s_3384979875.png" target="_blank"></a>

一般安装好rsyslog会自动生成rsyslog.d这个目录，若无自己创建

 #cd /etc/rsyslog.d/ &amp;&amp; touch haproxy.conf

#vim /etc/rsyslog.d/haproxy.conf

$ModLoad imudp

$UDPServerRun 514

 local0.* /var/log/haproxy.log ###这个必须和haproxy.cfg的配置文件一致。

#vim /etc/rsyslog.cnf

<a href="http://s2.51cto.com/wyfs02/M00/89/95/wKiom1gXXCSxPZC9AAB7MGU5SJk178.png-wh_500x0-wm_3-wmp_4-s_1871194254.png" target="_blank"></a>

3、重启服务

#service rsyslogrestart

现在你就可以看到日志（/var/log/haproxy.log）了

到此haproxy+keepalived 的结合完毕，只需要在haproxy.cfg添加服务即可。

配置监听 mycat是否存活

在192.168.1.112 和192.168.1.113 上添加检测端口48700，为此需要用到xinetd,xinetd为LINUX系统基础服务

1、若无xinetd服务，则安装

#yum –y installxinetd

2、检查/etc/xined.conf是否有：

3、添加/etc/xinetd.d/mycat_status，此目录安装后默认存在。

#vimmycat_status

service mycat_status

{

        flags          = REUSE

        socket_type    = stream

        port           = 48700

        wait           = no

        user           = root

        server         =/usr/local/bin/mycat_status

        log_on_failure += USERID

        disable        = no

4、把mycat_status添加到/etc/services服务中去

<a href="http://s2.51cto.com/wyfs02/M00/89/95/wKiom1gXXHPyhkgYAAA9nJACaRg738.png-wh_500x0-wm_3-wmp_4-s_2209662831.png" target="_blank"></a>

5、/usr/local/bin/mycat_status的脚本，并设置权限777

6、重启服务、验证mycat_status服务是否启动成功

#service xinetd restart

#netstat –antup |grep 48700

<a href="http://s2.51cto.com/wyfs02/M02/89/96/wKiom1gXXKPRycFuAAAX4GEe1M4675.png-wh_500x0-wm_3-wmp_4-s_3732285218.png" target="_blank"></a>

配置haproxy的脚本脚本，在/etc/keepalived目录添加目录sripts，存放haproxy的脚本脚本。

1、check_haproxy.sh

vi/etc/keepalived/scripts/check_haproxy.sh

##脚本含义：如果没有haproxy进程存在，就启动haproxy，停止keepalived

#!/bin/bash

STARTHAPROXY="/usr/local/haproxy/sbin/haproxy -f/usr/local/haproxy/haproxy.cfg"

STOPKEEPALIVED="/etc/init.d/keepalived stop"

LOGFILE="/usr/local/keepalived/var/log/keepalived-haproxy-state.log"

echo "[check_haproxystatus]" &gt;&gt;$LOGFILE

A=`ps-C haproxy --no-header |wc-l`

date &gt;&gt;$LOGFILE

if [ $A-eq 0 ];then

echo $STARTHAPROXY&gt;&gt; $LOGFILE

$STARTHAPROXY &gt;&gt; $LOGFILE  2&gt;&amp;1

sleep5

fi

if [`ps -C haproxy --no-header |wc-l` -eq 0 ];then

exit 0

else

exit 1

2、haproxy_master.sh(master和slave一样)：

3、haproxy_backup.sh(master和slave一样)

4、haproxy_fault.sh(master和slave一样)

5、haproxy_stop.sh

在/etc/keepalived.conf配置文件去掉#好，启动这些脚本

要给脚本的权限：777

<a href="http://s2.51cto.com/wyfs02/M00/89/94/wKioL1gXXOiRZa0BAAAerExqxPw625.png-wh_500x0-wm_3-wmp_4-s_3961955892.png" target="_blank"></a>

<a href="http://s3.51cto.com/wyfs02/M00/89/94/wKioL1gXXOmAhr3iAAA8yOS9ke8298.png-wh_500x0-wm_3-wmp_4-s_593174943.png" target="_blank"></a>

5、重启keepalived 服务

#Service keepalived restart

测试~~~Ing~~~~

本文转自 DBAspace 51CTO博客，原文链接:http://blog.51cto.com/dbaspace/1867872