LVS/DR结合keepalived

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huangchen4865 2016-03-16 12:18:56 ©著作权

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LVS/DR 配置

准备3台机器：

dir(192.168.220.141)
rs1(192.168. 220.143)
rs2(192.168.220.144)

vip(192.168.220.110)

Director 上 vim /usr/local/sbin/lvs_dr.sh //增加
#! /bin/bash
echo 1 > /proc/sys/net/ipv4/ip_forward
ipv=/sbin/ipvsadm
vip=192.168.220.110
rs1=192.168.220.143
rs2=192.168.220.144
ifconfig eth0:0 $vip broadcast $vip netmask 255.255.255.255 up
route add -host $vip dev eth0:0
$ipv -C
$ipv -A -t $vip:80 -s rr
$ipv -a -t $vip:80 -r $rs1:80 -g -w 1
$ipv -a -t $vip:80 -r $rs2:80 -g -w 1

两台rs上：vim /usr/local/sbin/lvs_dr_rs.sh
#! /bin/bash
vip=192.168.220.110
ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up
route add -host $vip 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

然后director上执行: bash /usr/local/sbin/lvs_dr.sh
两台rs上执行: bash /usr/local/sbin/lvs_dr_rs.sh
Windows下浏览器测试访问

结合keepalived

再准备一台机器作为备用dir(192.168.220.129)

在主dir上

vim /etc/keepalived/keepalived.conf

vrrp_instance VI_1 {
state MASTER #备用服务器上为 BACKUP
interface eth0
virtual_router_id 51
priority 100  #备用服务器上为90
advert_int 1
authentication {
      auth_type PASS
      auth_pass 1111
}
virtual_ipaddress {
      192.168.220.110
}
}
virtual_server 192.168.220.110 80 {
delay_loop 6                #(每隔10秒查询realserver状态)
lb_algo wlc                #(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 192.168.220.143 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 192.168.220.144 80 {
      weight 100
      TCP_CHECK {
      connect_timeout 10
      nb_get_retry 3
      delay_before_retry 3
      connect_port 80
      }
   }
}

scp /etc/keepalived/keepalived.conf 192.168.220.129://etc/keepalived/keepalived.conf

在备用dir上

vim /etc/keepalived/keepalived.conf

修改以下几处：

state MASTER -> state BACKUP
priority 100 -> priority 90

配置完keepalived后，需要开启端口转发（主从都要做）：
echo 1 > /proc/sys/net/ipv4/ip_forward
然后，两个rs上执行 /usr/local/sbin/lvs_dr_rs.sh 脚本
最后，两个director上启动keepalived服务（先主后从）：
/etc/init.d/keepalived start
另外，需要注意的是，启动keepalived服务会自动生成vip和ipvsadm规则，不需要再去执行上面提到的/usr/local/sbin/lvs_dr.sh 脚本。