lvs+keepalived

安装ipvsadmin
yum install -y gcc gcc-c++ makepcre pcre-devel kernel-devel openssl-devel libnl-devel popt-devel popt-static
tar -zxvf ipvsadm-1.26.tar.gz
cd ipvsadm-1.26
make && make install
ipvsadm -ln查看ipvsadm工作状态

配置keepalived
vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
[email protected]
   }
   notification_email_from [email protected]
   smtp_server mail.zhengjin99.com
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 101
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
172.16.33.123
    }
}

virtual_server 172.16.33.123 80 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 50
protocol TCP
real_server 172.16.33.126 80 {
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}

real_server 172.16.33.127 80 {
                weight 3
                TCP_CHECK {
                        connect_timeout 3
                        nb_get_retry 3
                        delay_before_retry 3
                }
        }
}

在realserver上书写脚本
vi realserver.sh
#!/bin/bash 
VIP=172.16.33.123
source /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 
       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