lvs+keepalived实现负载均衡

　　客户端通过VIP（Virtual IP）（10.10.3.160）来访问负载均衡服务器。负载均衡服务器通过MASTER:10.10.3.156或BACKUP:10.10.3.157将请求分别转发给真实Web服务器（real server1:10.10.3.158 real server2:10.10.3.159）。　

　　测试环境：

　　Director Server1(Master):10.10.3.156

　　Director Server2(Backup):10.10.3.157

　　VIP:10.10.3.160

　　Real server1:10.10.3.158

　　Real server2:10.10.3.159

　　LVS版本：ipvsadm-1.26

　　keepalived版本：keepalived-1.2.7

1、在两台Director Server上分别安装并配置LVS+Keepalived

2、安装LVS前系统需要安装

yum -y install kernel-devel openssl-devel lftplibnl* popt* libnl* libpopt* gcc*

3、两台Director Server分别安装并配置LVS：

cd /usr/src

wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.26.tar.gz

（如果已经创建了软连接，那么删除之: rm /usr/src/linux 注意不能带最后的/，否则无法删除。）

查看内核方法：cat /proc/version（下一步中的2.6.32-358.el6.x86_64则是此处的Linux version）

ln -s /usr/src/kernels/2.6.32-358.el6.x86_64/ /usr/src/linux

tar -zxvf ipvsadm-1.26.tar.gz

cd ipvsadm-1.26

make && make install

编写并运行脚本（LVS服务器的脚本）

vi lvs.sh

#!/bin/bash

VIP=10.10.3.160
RIP1=10.10.3.158
RIP2=10.10.3.159

/etc/rc.d/init.d/functions

logger $0 called with $1
case "$1" in

start)
echo " start LVS of DirectorServer"
/sbin/ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.255 up
/sbin/route add -host $VIP dev eth0:0
echo "1" >/proc/sys/net/ipv4/ip_forward

#Clear IPVS table
/sbin/ipvsadm -C
#set LVS
/sbin/ipvsadm -A -t $VIP:80 -s rr
/sbin/ipvsadm -a -t $VIP:80 -r $RIP1:80 -g
/sbin/ipvsadm -a -t $VIP:80 -r $RIP2:80 -g

#Run LVS
/sbin/ipvsadm
;;
stop)
echo "close LVS Directorserver"
echo "0" >/proc/sys/net/ipv4/ip_forward
/sbin/ipvsadm -C
/sbin/ifconfig eth0:0 down
;;
*)

echo "Usage: $0 {start|stop}"
exit 1
esac
~

注：/sbin/ipvsadm -A -t $VIP:80 -s rr (rr代表轮询，还有其他分配方式)

/sbin/ipvsadm -a -t $VIP:80 -r $RIP1:80 -g (-g代表DR模式，还有其他模式)

给脚本加权限，并执行

chmod +x lvs.sh

./lvs.sh start

4、两台Director Server分别安装并配置keepalived：

cd ..(cd /usr/src)

wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz

tar zxvf keepalived-1.2.7.tar.gz

cd keepalived-1.2.7

./configure

make && make install

---------将keepalived做成启动服务，方便管理---------

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

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

mkdir /etc/keepalived/

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

service keepalived start

-----------开启路由转发-----------

vi /etc/sysctl.conf

修改下面的值，从0修改到1：

net.ipv4.ip_forward = 1

刷新系统变量,使系统文件变更马上生效

sysctl -p

------------配置Keepalived-------------

vi /etc/keepalived/keepalived.conf

输入 :.,$d ,清空文件内容

重新输入的内容为：

! Configuration File for keepalived
global_defs {
   notification_email {
      king_819@163.com
   }
   notification_email_from king_819@163.com
   smtp_server smtp.163.com
  # smtp_connect_timeout 30
   router_id LVS_DEVEL
}



# VIP1
vrrp_instance VI_1 {
    state MASTER             #备份服务器上将MASTER改为BACKUP
    interface eth0
    lvs_sync_daemon_interface eth0
    virtual_router_id 51
    priority 100    # 备份服务上将100改为90
    advert_int 5
    authentication {
        auth_type PASS
        auth_pass 1111
    }

    virtual_ipaddress {
        10.10.3.160
        #(如果有多个VIP，继续换行填写.)
    }
}



virtual_server 10.10.3.160 80 {
    delay_loop 6                  #(每隔10秒查询realserver状态)
    lb_algo rr                  #(lvs 算法)
    lb_kind DR                  #(Direct Route)
    persistence_timeout 60        #(同一IP的连接60秒内被分配到同一台realserver)
    protocol TCP              #(用TCP协议检查realserver状态)

    real_server 10.10.3.158 80 {
        weight 100               #(权重)
        TCP_CHECK {
        connect_timeout 10       #(10秒无响应超时)
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }

    real_server 10.10.3.159 80 {
        weight 100
        TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
     }
}

chkconfig --level 0123456 keepalived on

查看自启动状态

chkconfig --list keepalived

service keepalived restart

5、两台Real Server(WEB1和WEB2机器)分别编辑如下文件

vi /root/lvs_real.sh

#!/bin/bash

# description: Config realserver

#Written by : http://kerry.blog.51cto.com

SNS_VIP=10.10.3.160



/etc/rc.d/init.d/functions



case "$1" in

start)

       /sbin/ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP

       /sbin/route add -host $SNS_VIP dev lo:0

       echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore

       echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce

       echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore

       echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce

       sysctl -p >/dev/null 2>&1

       echo "RealServer Start OK"



       ;;

stop)

       /sbin/ifconfig lo:0 down

       /sbin/route del $SNS_VIP >/dev/null 2>&1

       echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore

       echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce

       echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore

       echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce

       echo "RealServer Stoped"

       ;;

*)

       echo "Usage: $0 {start|stop}"

       exit 1

esac



exit 0

赋给执行权限

chmod 755 /etc/rc.d/init.d/functions 别人的配置文档中没这个步骤，我不知道为什么总是说执行到这句时没有权限，所以我添加了执行权限

chmod 755 /root/lvs_real.sh

/root/lvs_real.sh start

将四台机器的IPTABLES全部关闭，防止出现其它问题：service iptables stop

两台Director server 分别启动keepalived服务，并执行./lvs.sh start

两台Real server 分别执行/root/lvs_real.sh start

这样高可用服务就配置好了。

配置两台Director server开机启动项：

vi /etc/rc.d/rc.local

配置两台Real server开机启动项：

vi /etc/rc.d/rc.local

我是这样模拟真实需求测试的：在两台web主机上安装tomcat，端口均为80，将CRM项目分别部署到web主机上，启动tomcat，在两个主机上分别将CRM登录页增加显示real server1 和real server 2。这样通过访问http://10.10.3.160/crm 可以看见两个登录页轮询显示，即测试实验成功。

posted @ 2013-10-13 17:49 姜莹莹阅读(435) 评论(0) 编辑收藏举报

Jiang YY

lvs+keepalived实现负载均衡

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