lvs(dr)+keepalived

LVS原理請看：http://ixdba.blog.51cto.com/2895551/552947

LVS-MASTER 192.168.100.113

LVS-BACKUP 192.168.100.116

REALSERVER1 192.168.100.114

REALSERVER2 192.168.100.115

VIP 192.168.100.125

一. 在LVS-MASTER跟LVS-BACKUP安裝keepalived跟ipvsadm,我選擇yum安裝

[root@localhost ~]# yum install -y ipvsadm keepalived

安裝完成後配置keepalived

LVS-MASTER配置：

[root@localhost ~]# cd /etc/keepalived/

[root@localhost keepalived]# > keepalived.conf

[root@localhost keepalived]# vim keepalived.conf

將此段代碼複製進去

global_defs {

notification_email {

[email protected]

}

notification_email_from [email protected]

smtp_server 192.168.80.1

smtp_connection_timeout 30

router_id LVS_DEVEL # 設置lvs的id，在一個網絡內應該是唯一的

}

vrrp_instance VI_1 {

state MASTER #指定Keepalived的角色，MASTER爲主，BACKUP爲備

interface eth0 #設置對外服務的接口

virtual_router_id 51 #虛擬路由編號，主備要一致

priority 100 #定義優先級，數字越大，優先級越高，主DR必須大於備用DR

advert_int 1 #檢查間隔，默認爲1s

authentication { #設置驗證類型和密碼，master和buckup一定要設置一樣

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.100.125 #定義虛擬IP(VIP)爲192.168.100.125，可多設，每行一個

}

# 定義對外提供服務的LVS的VIP以及port

virtual_server 192.168.100.125 80 {

delay_loop 6 # 設置健康檢查時間，單位是秒

lb_algo wrr # 設置負載調度的算法爲wlc

lb_kind DR # 設置LVS實現負載的機制，有NAT、TUN、DR三個模式

nat_mask 255.255.255.0

persistence_timeout 0 #會話保持時間，單位秒

protocol TCP

real_server 192.168.100.114 80 { # 指定real server1的IP地址

weight 3 # 配置節點權值，數字越大權重越高

TCP_CHECK {

connect_timeout 10 #連接超時時間

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

real_server 192.168.100.115 80 { # 指定real server2的IP地址

weight 3 # 配置節點權值，數字越大權重越高

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

啓動keepalived 服務

[root@localhost ~]# service keepalived start

正在啓動 keepalived： [確定]

[root@localhost ~]# chkconfig keepalived on

[root@localhost ~]# chkconfig --list | grep keepalived

keepalived 0:關閉1:關閉2:啓用3:啓用4:啓用5:啓用6:關閉

LVS-BACKUP配置：

只需要將LVS-MASTER配置修改兩處即可

state BACKUP #指定Keepalived的角色，MASTER爲主，BACKUP爲備

priority 90 #定義優先級，數字越大，優先級越高，主DR必須大於備用DR

REALSERVER1跟REALSERVER2 配置

[root@localhost ~]# vi /etc/rc.d/init.d/realserver 把以下腳本貼到realserver裏去

#!/bin/bash
#cription: config realserver lo and apply noarp

WEB_VIP=192.168.100.125 #虛擬vip，也就是虛擬ip
. /etc/rc.d/init.d/functions

case "$1" in

start)
   ifconfig lo:0 $WEB_VIP netmask 255.255.255.255 broadcast $WEB_VIP
   /sbin/route add -host $WEB_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 "1" > /proc/sys/net/ipv4/conf/eth0/arp_ignore
   echo "2" > /proc/sys/net/ipv4/conf/eth0/arp_announce
   echo "1" > /proc/sys/net/ipv4/conf/default/arp_ignore
   echo "2" > /proc/sys/net/ipv4/conf/default/arp_announce
   sysctl -p >/dev/null 2>&1
   echo "RealServer Start OK"
   ;;
stop)
   ifconfig lo:0 down
   route del $WEB_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 "0" > /proc/sys/net/ipv4/conf/eth0/arp_ignore
   echo "0" > /proc/sys/net/ipv4/conf/eth0/arp_announce
   echo "0" > /proc/sys/net/ipv4/conf/default/arp_ignore
   echo "0" > /proc/sys/net/ipv4/conf/default/arp_announce
   echo "RealServer Stoped"
   ;;
status)
       # Status of LVS-DR real server.
       islothere=`/sbin/ifconfig lo:0 | grep $WEB_VIP`
       isrothere=`netstat -rn | grep "lo:0" | grep $WEB_VIP`
       if [ ! "$islothere" -o ! "isrothere" ];then
         # Either the route or the lo:0 device
         # not found.
         echo "LVS-DR real server Stopped."
       else
         echo "LVS-DR Running."
       fi
;;
*)
       # Invalid entry.
       echo "$0: Usage: $0 {start|status|stop}"
       exit 1
;;
esac
exit 0