lvs+keepalived实现LB热备实现网站高可用

在lvs高负载中，LB节点（也就是常说的DR）会存在单点问题；这里使用了keepalived来解决单点问题；实现冗余；

看图操作；

LB1：eth0:192.168.182.133  (vip：eth0:0 192.168.182.200)

LB2: eth0:192.168.182.138  (vip: eth0:0 192.168.182.200)

rs1: eth0:192.168.182.130  (vip: lo:0   192.168.182.200)

rs2: eth0:192.168.182.129  (vip: lo:0   192.168.182.200)

lvs模型为DR；

首先在两台rs1、rs2上进行操作；

echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 2 > /proc/sys/net/ipv4/conf/eth0/arp_announce
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 1 > /proc/sys/net/ipv4/conf/eth0/arp_ignore
service network restart
ifconfig lo:0 192.168.182.200 netmask 255.255.255.255 broadcast 182.168.182.200
route add -host 192.168.182.200 dev lo:0
yum install httpd -y
echo web1 > /var/www/html/index.html    #rs1标识web1
echo web2 > /var/www/html/index.html    #rs2标识web2
service httpd start

LB1、LB2上进行操作；

yum install ipvsadm keepalived httpd -y

LB1的上的keepalived配置文件

! Configuration File for keepalived
global_defs {
   notification_email {
    coffee_lanshan@sina.com
   }
   notification_email_from root@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_1
}
vrrp_instance VI_1 {
    state MASTER    #LB2为BACKUP
    interface eth0
    virtual_router_id 51
    priority 101       #LB2为100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass lansgg
    }
    virtual_ipaddress {
        192.168.182.200
    }
}
virtual_server 192.168.182.200 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    nat_mask 255.255.255.0
    persistence_timeout 50
    protocol TCP
    real_server 192.168.182.130 80 {
        weight 2
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 1
        connect_port 80
        }
    }
    sorry_server 127.0.0.1 80
    real_server 192.168.182.129 80 {
        weight 2
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 1
        connect_port 80
        }
    }
}

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