LVS + Keepalived之dr模式

kernelsky

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一、仅lvs服务器端安装
yum install ipvsadm openssl-devel popt popt-devel libnl-devel
cd /opt/src/
tar xzvf keepalived-1.2.7.tar.gz
cd keepalived-1.2.7
./configure
make && make install
cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/sbin/keepalived /usr/sbin/
 
修改/etc/keepalived/keepalived.conf文件
[iyunv@WEB ~]# cat /etc/keepalived/keepalived.conf 
! Configuration File for keepalived
 
global_defs {
   notification_email {
    
     123@123.com
   }
   notification_email_from 123@123.com
   smtp_server mail.123.com
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
 
vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 52
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
       192.168.1.88
    }
}
virtual_server 192.168.1.88 80 {
    delay_loop 6
    lb_algo lc
    lb_kind DR
    #lb_kind TUN
    persistence_timeout 60
    protocol TCP
    
    real_server 192.168.1.18 80 {
        weight 3           
        TCP_CHECK {
        connect_timeout 30  
        nb_get_retry 3
        delay_before_retry 2
        connect_port 80
        }
    }
    real_server 192.168.1.68 80 {
        weight 3
        TCP_CHECK {
        connect_timeout 30
        nb_get_retry 3
        delay_before_retry 2
        connect_port 80
        }
     }
 }
[iyunv@WEB ~]#
[iyunv@WEB ~]# service ipvsadm start
[iyunv@WEB ~]# service keepalived start
 
注意：
打开转发或关闭，dr/tun模式无影响
echo "1" > /proc/sys/net/ipv4/ip_forward
 
二、实际服务器端的操作
[iyunv@localhost ~]# cat /usr/local/vip.sh
#!/bin/bash
# Script to start LVS DR real server.
# description: LVS DR real server
.  /etc/rc.d/init.d/functions
VIP=192.168.1.88
#host=`/bin/hostname`
case "$1" in
start)
       # Start LVS-DR real server on this machine.
        /sbin/ifconfig lo down
        /sbin/ifconfig lo 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
        /sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
        /sbin/route add  $VIP dev lo:0
;;
stop)
        # Stop LVS-DR real server loopback device(s).
        /sbin/ifconfig lo:0 down
        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
;;
status)
        # Status of LVS-DR real server.
        islothere=`/sbin/ifconfig lo:0 | grep $VIP`
        isrothere=`netstat -rn | grep "lo:0" | grep $VIP`
        if [ ! "$islothere" -o ! "isrothere" ];then
            # Either the route or the lo:0 device
            # not found.
            echo "LVS-DR real server Stopped."
        else
            echo "LVS-DR real server Running."
        fi
;;
*)
            # Invalid entry.
            echo "$0: Usage: $0 {start|status|stop}"
            exit 1
;;
esac
[iyunv@localhost ~]#  /usr/local/vip.sh start|stop|status
 
 
 
 
三、lvs查看
 
ipvsadm -ln
ipvsadm -lnc
ipvsadm -l -n --stats
 
调度算法：rr|wrr|lc|wlc|lblc|lblcr|dh|sh|sed|nq