LVS+keepalive

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本文详细介绍了如何在CentOS6.4操作系统中配置LVS负载均衡，包括安装必要的软件包、编辑配置文件、设置VIP、启动服务以及通过ipvsadm命令进行操作。

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写于2013年秋，CentOS6.4

1、LVS主机

[hadoop@slave3 dw]$ sudo yum install ipvsadm
[hadoop@slave3 dw]$ sudo yum install keepalived
[hadoop@slave3 dw]$ sudo vi /etc/keepalived/keepalived.conf
         ! Configuration File for keepalived
global_defs {
   router_id LVS_MASTER      #网上资料说这个值也需要修改，具体不详，之前我们线上的主备就一直是一样的 ^ ^还是修改一下吧！
}
vrrp_instance VI_1 {
    state MASTER             #LVS_Backup上修改成BACKUP
    interface eth0
    virtual_router_id 51
    priority 100             #LVS_Backup上修改成80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.95.3.68
    }
}
virtual_server 10.95.3.68 21050 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    persistence_timeout 50
    protocol TCP

    real_server 10.95.3.67 21050 {
        weight 1
        TCP_CHECK {
               connect_timeout 10
               nb_get_retry 3
               connect_port 21050
        }
    }
    real_server 10.95.3.65 21050 {
        weight 1
        TCP_CHECK {
               connect_timeout 10
               nb_get_retry 3
               connect_port 21050
        }
    }
}
virtual_server 10.95.3.68 8888 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    persistence_timeout 50
    protocol TCP

    real_server 10.95.3.67 8888 {
        weight 1
        TCP_CHECK {
               connect_timeout 10
               nb_get_retry 3
               connect_port 8888
        }
    }
    real_server 10.95.3.65 8888 {
        weight 1
        TCP_CHECK {
               connect_timeout 10
               nb_get_retry 3
               connect_port 8888
        }
    }
}

待检验
[hadoop@slave3 dw]$ vi /dw/bin/vip.sh

!/bin/bash

VIP=10.95.3.68
/sbin/ifconfig eth7:0 $VIP broadcast$ VIP netmask 255.255.255.255 up
/sbin/route add -host $VIP dev eth7:0 [hadoop@slave3 dw]$ chmod a+x /dw/bin/vip.sh
[hadoop@slave3 dw]$ sudo /dw/bin/vip.sh
2、每台应用主机

[hadoop@slave4 ~]$  vi /dw/bin/real_server.sh
#!/bin/bash
VIP=10.95.3.68
. /etc/rc.d/init.d/functions
case "$1" in
start)
     ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP
     /sbin/route add -host $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)
     ifconfig lo:0 down
     route del $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: $0 {start|stop}"
     exit 1
esac
exit 0
[hadoop@slave4 ~]$ chmod u+x /dw/bin/real_server.sh
[hadoop@slave4 ~]$ sudo /dw/bin/real_server.sh start

3、lvs主机

[hadoop@slave3 dw]$  sudo chkconfig keepalived on
[hadoop@slave3 dw]$ sudo service keepalived restart

4、查看

sudo watch ipvsadm

查看LVS的连接情况: sudo ipvsadm -L -n
查看LVS的吞吐量情况: sudo ipvsadm -L -n --rate
查看LVS的统计信息: sudo ipvsadm -L -n --stats
实时查看LVS连接状态变化: sudo watch ipvsadm -ln
5、ipvsadm命令，此命令只对LVS有效，不会更新到/etc/keepalived/keepalived.conf

sudo ipvsadm -A -t 10.95.3.68:8042 -s rr                               #添加虚拟地址
sudo ipvsadm -a -t 10.95.3.68:8042 -r 10.95.3.63:8042 -g        #添加real_server 10.95.3.63并使用dr模式
sudo ipvsadm -a -t 10.95.3.68:8042 -r 10.95.3.64:8042 -g          #添加real_server 10.95.3.64并使用dr模式

sudo ipvsadm -S                                                  #保存上述规则到内核
sudo ipvsadm -d -t 10.95.3.68:8042 -r 10.95.3.64:8042            #删除real_server 10.95.3.64
sudo ipvsadm -D -t 10.95.3.68:8042                                        #删除虚拟地址