keepalive+lvs

 keepalive+lvs這種方式配置很快捷，一塊網卡就可以搞定，網絡斷掉，機器關掉或者服務停掉都可以切換過去，而且還會發送郵件通知，推薦。

 

主備機上的軟件包安裝與配置

 

Virtual IP:192.168.0.147
Load Balancer: eth0:192.168.0.46
Load Balancer: eth0:192.168.0.94
Real Server 1:192.168.0.64
Real Server 2:192.168.0.67

 

keepalived-1.2.2.tar.gz
kernel-devel (整合內核中的lvs功能)
gcc
make
openssl-devel
popt-devel
libnl-devel

 

 

 

tar zxf keepalived-1.2.2.tar.gz
./configure --with-kernel-dir=/usr/src/kernels/2.6.32-71.el6.x86_64/ --prefix=/usr/local/keepalive （制定內核源碼位置，制定安裝位置便於以後管理）
make
make install
ln -s /usr/local/keepalive/etc/rc.d/init.d/keepalived /etc/init.d/
ln -s /usr/local/keepalive/etc/keepalived/ /etc/
ln -s /usr/local/keepalive/sbin/keepalived /usr/sbin/
ln -s /usr/local/keepalive/etc/sysconfig/keepalived /etc/sysconfig/
ln -s /usr/local/keepalive/etc/rc.d/init.d/keepalived  /etc/init.d/

 

vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
   notification_email {
        root@localhost #接收警報的 email 地址,可以添加多個
   }
   notification_email_from yejkkeepalive@localhost
   smtp_server 127.0.0.1 #使用本機轉發 email
   smtp_connect_timeout 30
   router_id LVS_yejk #load balancer 的標識 ID,用於 email 警報
}
vrrp_instance VI_1 {
    state MASTER   #備機改爲 BACKUP,此狀態是由 priority 的值來決定的
    interface eth0  #HA 監測網絡接口
    virtual_router_id 82 #主、備機的 virtual_router_id 必須相同
    priority 150 #主機的優先級,備份機改爲 50
    advert_int 1 #主備之間的通告間隔秒數
    authentication { #主備切換時的驗證
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress { #HA 虛擬 ip,可加多個
        192.168.0.147
    }
}
virtual_server 192.168.0.111 80 {
    delay_loop 6 #每隔 6 秒查詢 realserver狀態
    lb_algo rr #lvs 調度算法,這裏使用輪叫
    lb_kind DR #lvs 負載均衡機制,這裏使用直連路由
#    persistence_timeout 50 #同一 IP 的連接 50 秒內被分配到同一臺 realserver
    protocol TCP #用 TCP 協議檢查 realserver 狀態
    real_server 192.168.0.64 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3  #故障重試秒數
            delay_before_retry 3  #重試延遲
        }
    }
    real_server 192.168.0.67 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}


注:備機的 keepalived 配置文件只改state和priority

 

分別在 realserver 上執行以下命令

 

vi /etc/sysctl.conf
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.lo.arp_announce = 2
sysctl -p
ifconfig eth0:0 192.168.0.147 netmask 255.255.255.255 up
route add -host 192.168.0.147 dev eth0:0
echo `hostname` > /var/www/html/index.html
service httpd start

測試:

訪問 http://192.168.0.111,看到頁面在兩個 realserver 上切換表示成功!

也可以通過 ipvsadm -Lnc 查看詳細連接情況!