lvs dr keepalived配置方案

lvs-dr+keepalived是linux下的經典負載均衡解決方案，因其配置簡單、效能優越而廣受歡迎，dr是基於二層mac位址的**，real server收到請求後直接響應客戶機，所以這種架構的效率很高，不過要求lvs server和real server在同乙個物理網段內，就是在同乙個交換機下，架構圖如下：

keepalived是保證乙個lvs server失效以後啟用備份lvs server的，我給我的配置方案如下：

lvs server1 10.20.3.74

lvs server2 10.20.3.76

realserver1 10.20.3.93

realserver2 10.20.3.94

virtual ip 10.20.3.78

一、lvs server配置

安裝keepalived和ipvsadm 1.24

#ln -s /usr/src/kernels/2.6.18-53.el5pae-i686/ /usr/src/linux 這一步很重要，要不然會編譯報錯

#tar zxvf keepalived-1.2.2.tar.gz

#cd keepalived-1.2.2

#./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/

#tar zxvf ipvsadm1.24.tar.gz

#cd ipvsadm1.24

#./configure && make && make install

安裝keepalived 時，configure完成是這樣的

keepalived configuration

------------------------

keepalived version : 1.2.2

compiler : gcc

compiler flags : -g -o2 -dethertype_ipv6=0x86dd

extra lib : -lpopt -lssl -lcrypto

use ipvs framework : yes

ipvs sync daemon support : yes

ipvs use libnl : no

use vrrp framework : yes

use debug flags : no

如果要用到lvs的話，use ipvs framework必須是yes的

/usr/include/stdint.h:41: error: conflicting types for 『int64_t』

編譯keepalived-1.2.2，執行make時出現錯誤。這個錯誤出現的原因可能是標頭檔案linux/types.h和sys/types.h的int64_t、u_int64_t定義有衝突，標頭檔案linux/types.h在定義int64_t等時沒有防止重複定義，而sys/types.h標頭檔案在定義int64_t等時是有防止重複定義的措施的。將sys/types.h(其中包含了linux/types.h)放到所有標頭檔案的前面，問題解決

! configuration file for keepalived

global_defs

# notification_email_from localhost@lvs-server1

# smtp_server 127.0.0.1

# smtp_connect_timeout 30

router_id lvs_devel

}vrrp_instance vi_1

virtual_ipaddress

}virtual_server 10.20.3.78 80

}real_server 10.20.3.94 80 }}

啟動keepalived，#service keepalived start

以上輸出表示配置成功

#ping 10.20.3.78

ping 10.20.3.78 (10.20.3.78) 56(84) bytes of data.

64 bytes from 10.20.3.78: icmp_seq=1 ttl=64 time=0.043 ms

64 bytes from 10.20.3.78: icmp_seq=2 ttl=64 time=0.042 ms

通了，表示位址正常

二、real server配置

real server增加乙個啟動指令碼即可，不需要安裝任何軟體，我的如下

/usr/sbin/realserver.sh

vip=10.20.3.78

sh /etc/rc.d/init.d/functions

case "$1" in

start)

ifconfig lo:0 $vip netmask 255.255.255.255 broadcast $vip up

/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

sysctl -p >/dev/null 2>&1

echo "realserver start ok"

;;stop)

route del $vip >/dev/null 2>&1

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

echo "realserver stoped"

;;*)

echo "usage: $0 "

exit 1

esac

exit 0

放到/usr/sbin下賦予執行許可權，在/etc/rc.local增加一行隨機啟動sh /etc/sbin/realserver.sh

ifconfig可以看到多了乙個介面

lo:0 link encap:local loopback

inet addr:10.20.3.78 mask:255.255.255.255

up loopback running mtu:16436 metric:1

三、驗證

訪問10.20.3.78，如果能轉到10.20.3.93/94的內容，即表示配置成功

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