LVS-DR安装配置（ipvsadm+keepalived）

看到标题，你就知道我做什么，所以这里直接贴安装和配置步骤。
VIP： 192.168.1.98
LVS主：192.168.1.216 (redhat5-2.6.18-194.el5-x86_64)
LVS备：192.168.1.217 (redhat5-2.6.18-194.el5-x86_64)
real_server1:192.168.1.220 (suse11)
real_server2:192.168.1.226 (redhat5)

一、LVS主、备上都安装ipvsadm + keepalived
安装ipvsadm-1.24
1， wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz
2，创建一个连接文件：ln -sv /usr/src/kernels/2.6.18-194.el5-x86_64/ /usr/src/linux
3，解压：tar zxvf ipvsadm-1.24.tar.gz
4，安装：cd ipvsadm-1.24; make;make install
5，执行ipvsadm，检验ipvsadm 是否被正确安装

安装keepalived-1.1.20 （当前最新是1.2.2，发现安装不上，就选了1.1.*的最新一个版本）
1，wget http://www.keepalived.org/software/keepalived-1.1.20.tar.gz
2，解压：tar zxvf keepalived-1.1.20.tar.gz
3，安装：cd keepalived-1.1.20; ./configure –prefix=/usr/local/keepalive; make;make install
安装完成生成目录：/usr/local/keepalived
4，配置keepalived.conf ：
vi /usr/local/keepalive/etc/keepalived/keepalived.conf
LVS主：

! Configuration File for keepalived

global_defs {
   router_id LVS_DEVEL_1
}
vrrp_sync_group VGM {
    group {
        VI_CACHE
    }
}

vrrp_instance VI_CACHE {
    state MASTER
    interface eth0
    lvs_sync_daemon_inteface eth0
    virtual_router_id 216
    priority 150
    advert_int 5
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.98
    }
}
virtual_server 192.168.1.98 80 {
    delay_loop 6
    lb_algo wlc
    lb_kind DR
#    persistence_timeout 50  (这里可以让访问的IP在一段时间转发到相同的real_server)
    protocol TCP

    real_server 192.168.1.226 80 {
        weight 100
        TCP_CHECK {
            connect_timeout 5
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }

    real_server 192.168.1.220 80 {
        weight 100
        TCP_CHECK {
            connect_timeout 5
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}

LVS备的配置多和LVS主的配置一致，需要修改以下几段：

global_defs {
   router_id LVS_DEVEL_2 #随便取，不重复就行
}

vrrp_instance VI_CACHE {
    state BACKUP #
    interface eth0
    lvs_sync_daemon_inteface eth0
    virtual_router_id 217  #随便取，不重复就行
    priority 100   #备比主的值小就行
    advert_int 5
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.98
    }
}

配置完成。
LVS主/备启动keepalived。因为我的配置文件的路径不是/etc/keepalived/keepalived.conf
所以必须带上-f或--use-file

/usr/local/keepalive/sbin/keepalived --use-file /usr/local/keepalive/etc/keepalived/keepalived.conf

5，开启net.ipv4.ip_forward = 1 在 /etc/sysctl.conf 中，并使生效：sysctl -p

二、real_server都增加以下脚本并启动

#!/bin/bash
#description : start realserver
VIP=192.168.1.98
/etc/rc.d/init.d/functions
case "$1" in
start)
echo " start LVS of REALServer"
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
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
;;
stop)
/sbin/ifconfig lo:0 down
echo "close LVS Directorserver"
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 "Usage: $0 {start|stop}"
exit 1
esac

启动：/usr/local/bin/lvs_real start

在局域网中的其它电脑上ping 192.168.1.98 ，如果不通请先检查防火墙相关设置。

正在 Ping 192.168.1.98 具有 32 字节的数据:
来自 192.168.1.98 的回复: 字节=32 时间=6ms TTL=64
来自 192.168.1.98 的回复: 字节=32 时间=1ms TTL=64
来自 192.168.1.98 的回复: 字节=32 时间=1ms TTL=64
来自 192.168.1.98 的回复: 字节=32 时间=1ms TTL=64

配置成功。

LVS-DR安装配置（ipvsadm+keepalived）

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