keepalived入门之keepalive+haproxy双机热备

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Keepalive+haproxy双机热备

如图所示为整体的拓扑图：

一.部署前说明：

(1)系统版本: centos 6.6（64位）

(2)角色及ip相关信息:

角色名称	网络ip信息
客户端(CIP)	10.58.137.203/24
Master_DR	eth0:172.51.96.105/24 &&  eth1:192.168.0.105/24
Backup_DR	eth0:172.51.96.119/24 &&  eth1:192.168.0.119/24
VIP	172.51.96.175/24

(3)相关中间件信息

keepalive版本信息: keepalived-1.2.15

nginx版本信息:  haproxy-1.5.15  （提供proxy代理）

二.部署操作：

haproxy部署

分别在Master_DR和backup_DR上安装haproxy，操作如下：

1.1 到haproxy官网下载haproxy源码包如下
cd ~
wget http://www.haproxy.org/download/1.5/src/haproxy-1.5.15.tar.gz

1.2 创建haproxy运行用户

groupadd -r haproxy
useradd -r -g haproxy -M -s /sbin/nologin haproxy

1.3 编译安装haproxy：

cd ~
tar zxvf haproxy-1.5.15.tar.gz -C /usr/local/src
cd /usr/local/src/haproxy-1.5.15
make TARGET=linux26 PREFIX=/usr/local/haproxy
make install PREFIX=/usr/local/haproxy

注意：TARGET=Linux26 是通过uname -a 来查看Linux内核版本的

1.4 创建haproxy主配置文件：

mkdir /etc/haproxy/
vim /etc/haproxyhaproxy.cfg

其中master_dr以及backup_dr上的haproxy配置代码内容如下

#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
        log 127.0.0.1   local3            
        maxconn 204800
        chroot /usr/local/haproxy
        user  haproxy
        group haproxy
        daemon
        nbproc 1
        pidfile /var/run/haproxy.pid
        stats socket /usr/local/haproxy/stats
        description haproxy server
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
        log     global
        mode    http
        maxconn 10000
        option  httplog
        option  httpclose
        option  dontlognull
        option  forwardfor      except 127.0.0.0/8
        retries 3
        option redispatch
        option abortonclose
        balance roundrobin
        timeout http-request    10s
        timeout queue           1m
        timeout connect         10s
        timeout client          1m
        timeout server          1m
        timeout http-keep-alive 10s
        timeout check           10s
#---------------------------------------------------------------------
# use listen setting the haproxy status for site
#---------------------------------------------------------------------
listen admin_status     #设置haproxy监控状态
        bind *:3030
        mode http
        log 127.0.0.1 local3 err
        stats refresh 5s
        stats uri /status     #监控状态页面访问url
        stats realm www.skeryp.com
        stats auth admin:admin
        stats hide-version
        stats admin if TRUE
#------------------------------

1.5 创建haproxy系统服务启动脚本：

关于haproxy服务脚本代码请访问:http://www.iyunv.com/thread-190479-1-1.html
1.6 启动haproxy服务：

server haproxy restart


Keepalive部署

(1)分别在Master_DR和backup_DR上安装keepalive，操作如下：

1. 安装Keepalive所需要的相关依赖包:

# yum install openssl-devel popt-devel libnl-devel kernel-devel  -y

2. 编译安装keepalive

1.1 keepalived的源码获取

keepalived源码包我们可以到keepalived的官网:http://www.keepalived.org/去下载，相关说明文档亦可在其官网查看，比如keepalived的使用，相关配置说明，这里演示的版本为:1.2.15

cd ~
wget http://www.keepalived.org/software/keepalived-1.2.15.tar.gz

1.2 编译安装keepalived

<--编译安装keepalived-->

ln -s /usr/src/kernels/2.6.32-573.18.1.el6.x86_64/ /usr/src/linux
tar zxvf keepalived-1.2.15.tar.gz -C /usr/local/src
cd /usr/local/src/keepalived-1.2.15/
./configure \
--prefix=/usr/local/keepalived \
--with-kernel-dir=/usr/src/kernels/2.6.32-573.18.1.el6.x86_64
#2.6.32-573.18.1.el6.x86_64 这个需要根据kernel来匹配，一般安装了kernel-devel即可查看
make  make install

<--对keepalived进行相关路径优化调整-->

<---拷贝keepalived相关启动命令--->
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

<---将keepalived启动脚本添加到系统服务--->
# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
# chkconfig --add keepalived
# chkconfig --level 2345 keepalived on

<---创建keepalived相关配置文件--->
# mkdir -p /etc/keepalived
# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived

(3)分别配置Master_DR以及Backup_DR上的keepalive实例，如下所示:

1. master_dr配置代码示例（主调度器）

vim /etc/keepalived/keepalived.conf

内容如下

! Configuration File for keepalived

global_defs {
   notification_email {
       admin@bluemobi.cn
   }
   notification_email_from  lvs_admin@bluemobi.cn
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id DR_MASTER
}

vrrp_script check_haproxy {                              #表示创建一个脚本check_haproxy
   script "/etc/keepalived/scripts/check_haproxy.sh"     #引用的脚本路径
   interval 3                                          #表示检测时间的间隔为3s
}

vrrp_instance http {
    state BACKUP
    interface eth0   
    dont_track_primary
    nopreempt                        #不抢占master

    track_interface {                #表示需要检测的网卡
    eth0
    eth1
    }

    mcast_src_ip 172.51.96.105       #表示设置组播的源地址
    garp_master_delay 6
    virtual_router_id 60
    priority 110
    advert_int 1

    authentication {
    auth_type PASS
    autp_pass 1234
    }

    virtual_ipaddress {
    172.51.96.175/24 brd  172.51.96.255 dev eth0 label eth0:1
    }

    virtual_routes {
    172.51.96.175/24 dev eth0
    }

    track_script {
    check_haproxy
    }

    notify_master /etc/keepalived/scripts/state_master.sh
    notify_backup /etc/keepalived/scripts/state_backup.sh
    notify_fault  /etc/keepalived/scripts/state_fault.sh
}

2. backup_dr配置示例（备调度器）

vim /etc/keepalived/keepalived.conf

内容如下

! Configuration File for keepalived

global_defs {
   notification_email {
       admin@bluemobi.cn
   }
   notification_email_from  admin@bluemobi.cn
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id DR_BACKUP
}

vrrp_script check_haproxy {
   script "/etc/keepalived/scripts/check_haproxy.sh"
   interval 3
}

vrrp_instance http {
    state BACKUP
    interface eth0
    dont_track_primary

    track_interface {
    eth0
    eth1
    }

    mcast_src_ip 172.51.96.119
    garp_master_delay 6
    virtual_router_id 60
    priority 105
    advert_int 1

    authentication {
    auth_type PASS
    autp_pass 1234
    }

    virtual_ipaddress {
    172.51.96.175/24 brd  172.51.96.255 dev eth0 label eth0:1
    }

    virtual_routes {
    172.51.96.175/24 dev eth0
    }
   
    track_script {
    check_haproxy
    }

    notify_master /etc/keepalived/scripts/state_master.sh
    notify_backup /etc/keepalived/scripts/state_backup.sh
    notify_fault  /etc/keepalived/scripts/state_fault.sh
}

3.分别在主调度server和备调度server编写以下脚本，如下：

i 当调度器为切换master server时，记录切换时间日志

vim /etc/keepalived/scripts/state_master.sh

代码如下:

#!/bin/bash
echo -e  >> $LOGFILE
host=CN-SH-DR01      #设置当前的主机名
LOGFILE="/var/log/keepalived-state.log"
echo "[Master]" >> $LOGFILE
date >> $LOGFILE
echo "The ${host}  Starting to become master server...." >> $LOGFILE 2>&1

echo "Please run the “ipvsadm -Ln”  check the keepalived state ..." >> $LOGFILE
echo ".........................................................................!">> $LOGFILE
echo >>$LOGFILE

ii 当调度器为切换backup server时，记录切换时间日志

vim /etc/keepalived/scripts/state_backup.sh

代码如下:

#!/bin/bash
echo -e >> $LOGFILE
host=CN-SH-DR01     #设置当前的主机名
LOGFILE="/var/log/keepalived-state.log"
echo "[Backup]" >> $LOGFILE
date >> $LOGFILE
echo "The ${host}  Starting to become Backup server...." >> $LOGFILE 2>&1

echo "Please run the “ipvsadm -Ln”  check the state ..." >> $LOGFILE
echo "........................................................................!">> $LOGFILE
echo  >> $LOGFILE

iii  当调度器出现错误时，记录错误时间日志

vim /etc/keepalived/scripts/state_fault.sh

代码如下:

#!/bin/bash
echo -e >> $LOGFILE
host=CN-SH-DR01      #设置当前的主机名
LOGFILE="/var/log/keepalived-state.log"
echo "[fault errot ]" >> $LOGFILE
date >> $LOGFILE
echo "The ${host}  is fault error...." >> $LOGFILE 2>&1
echo "Please check the server state ..." >> $LOGFILE
echo "........................................................................!">> $LOGFILE
echo  >> $LOGFILE

iiii 服务状态健康监测脚本,比如当haproxy不可用时，及时切换到backup调度器上

vim /etc/keepalived/scripts/check_haproxy.sh

#!/bin/bash
#nginx="/usr/local/haproxy/sbin/haproxy"

PID=`ps -C haproxy --no-heading|wc -l`
if [ "${PID}" = "0" ];
    then
         /etc/init.d/haproxy start
    sleep 3
    LOCK=`ps -C haproxy --no-heading|wc -l`
    if [ "${LOCK}" = "0" ];
    then
        /etc/init.d/keepalived stop
    fi
fi

(4)依次重启master_dr,backup-dr上keepalive服务

# service keepalived restart


三.测试验证：

在两台调度器创建相关测试页，如下：

master-dr主调度服务器的测试页面

[iyunv@master-dr www]# curl 172.51.96.105
this is master server
[iyunv@master-dr www]#

backup-dr主调度服务器的测试页面

[iyunv@backup-dr htdocs]# curl 127.0.0.1

this is backup server
[iyunv@backup-dr htdocs]#

通过messages查看vip抢夺情况，如下所示: