部署lvs+keepalived

1.总共需要四台机器，五个ip, 两台机器作为负载均衡director，两台机器作为real server, 一人ip作为虚拟ip,供外网用。

2.部署director master:

a. 安装keepalived：yum install keepalived

b.安装ipvs: yum install ipvsadm

c.配置keepalived:

cd /etc/keepalived/

vi keepalived.conf

内容如下：

! Configuration File for keepalived
vrrp_instance VI_1 {
    state MASTER
    interface eth1
    virtual_router_id 46
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass kevin_kocla
    }
    virtual_ipaddress {
       192.168.77.142
    }
}

virtual_server 192.168.77.142 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 3600
    protocol TCP

    real_server 192.168.77.42 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 30
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }

    real_server 192.168.77.44 80 {
        weight 2
        TCP_CHECK {
            connect_timeout 30
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}
其中192.168.77.142为虚拟ip.

3.部署director backup:

方法同2，整个配置文件拷过来修改，配置文件中

state MASTER 改为：state BACKUP

priority 100 改为：priority 80

4.部署real server, 在/etc/init.d目录下增加lvsrs文件，并赋予755权限，lvsrs内容如下：

#!/bin/bash
#description : Start Real Server
VIP=192.168.77.142
. /etc/rc.d/init.d/functions
case "$1" in
start)
echo " Start LVS of Real Server "
/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 Director server"
    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
注意在windows环境下编辑，在linux上有可以不能执行。

5. 部署另一台 real server.

6. 依次启动：

director master: service keepalived start

director backup: service keepalived start

real server 1 : service lvsrs start

rela server 2: service lvsrs start

7.测试访问。

可能用到命令：

ip add

ip add list

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