一：安裝配置 LVS+DR+Keepalived
client 訪問的地址 VIP 192.168.133.100
?????? 負載服務器master真實IP??????? 192.168.133.128
?????? 負載服務器backup真實IP??? 192.168.133.150
?????? 負載服務器虛擬IP????????????? 192.168.133.100
?????? 后端WEB服務器IP???????????????? 192.168.133.128
?????? 后端WEB服務器IP???????????????? 192.168.133.150
系統：Redhat 5.4 x86 內核：2.6.18-164.el5
1.下載所需要的軟件：ipvsadm keepalived
wget? http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz ??? 我這里是直接安裝的RHEL4.0自帶的ipvsadm-1.24-6.i386.rpm
wget? http://www.keepalived.org/software/keepalived-1.1.18.tar.gz
2.安裝ipvsadm(負載均衡器都要配置master和backup)
? 從Linux內核版本2.6起，ip_vs code已經被整合進了內核中，因此，只要在編譯內核的時候選擇了ipvs的功能，您的Linux即能支持LVS。Linux 2.4.23以后的內核版本也整合了ip_vs code，但如?? 果是更舊的內核版本，您得自己手動將ip_vs code整合進內核原碼中，并重新編譯內核方可使用lvs。
?? 我使用的RHEL4.0? 這個版本支持ipvsadm，所以無需更改內核配置? rpm -ivh ipvsadm-1.24-6.i386.rpm
?? 然后使用ipvsadm -v
?? ipvsadm v1.24 2005/12/10 (compiled with popt and IPVS v1.2.1)
?? 則Ipvsadm安裝成功??????????????????????????????????????????????????????????
3.安裝keepalived負載均衡器都要配置master和backup)? 以下建議完全參照，否則會有一些問題
tar??? zxvf keepalived-1.1.18tar.gz
cd keepalived-1.1.18
./configure --prefix=/usr/local/keepalived
make?
make install
?cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
?cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
?mkdir /etc/keepalived
?cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
?cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
啟動keepalived
service keepalived start|stop|restart

4.配置master和backup
A．開啟ip_forward 轉發功能：
echo 1 >/proc/sys/net/ipv4/ip_forward?? 默認是0，關閉ip轉發；這里需要開啟，所以設置值為1
B．配置keepalived.conf 配置文件 （backup 192.168.133.150）
! Configuration File for keepalived

global_defs {
?? notification_email {
????? acassen@firewall.loc
????? failover@firewall.loc
????? sysadmin@firewall.loc
?? }
?? notification_email_from? Alexandre.Cassen@firewall.loc
?? smtp_server 192.168.133.128
?? smtp_connect_timeout 30
?? router_id LVS_DEVEL
}

vrrp_instance VI_1 {???????? #配置負載均衡器的 主和備 ，并做相關設置
??? state BACKUP???????????? #備份服務器上將MASTER改為BACKUP?
??? interface eth0?????????? #HA監測網絡接口
??? virtual_router_id 51???? #主、備機的virtual_router_id必須相同
??? priority 100???????????? #主、備機取不同的優先級，主機值較大，備份機值較小
??? advert_int 1???????????? #VRRP Multicast廣播周期秒數
??? authentication {
??????? auth_type PASS?????? #VRRP認證方式
??????? auth_pass 1111?????? #VRRP口令字
??? }
??? virtual_ipaddress {
??????? 192.168.133.100????? #(如果有多個VIP，繼續換行填寫.)
????????
??? }
}

virtual_server 192.168.133.100 80 {????? VIP設置
??? delay_loop 2???????????????????????? #每隔2秒查詢realserver狀態
??? lb_algo rr?????????????????????????? #lvs 算法
??? lb_kind DR?????????????????????????? #Direct Route
??? nat_mask 255.255.255.0???????????????
??? persistence_timeout 50?????????????? #同一IP的連接60秒內被分配到同一臺realserver
??? protocol TCP???????????????????????? #用TCP協議檢查realserver狀態

??? real_server 192.168.133.128 80 {???? 真實主機1配置
??????? weight 100?????????????????????? #設置后臺主機的權重
??????? TCP_CHECK {????????????????????? #TCP協議檢查
??????????? connect_timeout 3??????????? #
??????????? nb_get_retry 3?????????????? #
??????????? delay_before_retry 3???????? #
??????? }
??? }
??? real_server 192.168.133.150 80? {??? 真實主機2配置
??????? weight 1???????????????????????? #設置后臺主機的權重
??????? TCP_CHECK {????????????????????? #TCP協議檢查
??????????? connect_timeout 3??????????? #
??????????? nb_get_retry 3?????????????? #
??????????? delay_before_retry 3???????? #
??????? }
??? }
}
配置keepalived.conf 配置文件 （master 192.168.133.128）
! Configuration File for keepalived
global_defs {
?? notification_email {
????? acassen@firewall.loc
????? failover@firewall.loc
????? sysadmin@firewall.loc
?? }
?? notification_email_from? Alexandre.Cassen@firewall.loc
?? smtp_server 192.168.133.128
?? smtp_connect_timeout 30
?? router_id LVS_DEVEL
}
vrrp_instance VI_1 {
??? state MASTER
??? interface eth0
??? virtual_router_id 51
??? priority 100
??? advert_int 1
??? authentication {
??????? auth_type PASS
??????? auth_pass 1111
??? }
??? virtual_ipaddress {
??????? 192.168.133.100
??? }
}

virtual_server 192.168.133.100 80 {
??? delay_loop 2
??? lb_algo rr
??? lb_kind DR
??? nat_mask 255.255.255.0
??? persistence_timeout 50
??? protocol TCP

??? real_server 192.168.133.128 80 {
??????? weight 100
??????? TCP_CHECK {
??????????? connect_timeout 3
??????????? nb_get_retry 3
??????????? delay_before_retry 3
??????? }
??? }
??? real_server 192.168.133.150 80 {
??????? weight 1
??????? TCP_CHECK {
??????????? connect_timeout 3
??????????? nb_get_retry 3
??????????? delay_before_retry 3
??????? }
??? }
}

5.配置 VIP:?? master 配置一下就可以
vim /etc/sysconfig/network-scripts/ifcfg-lo:0
DEVICE=lo:0
IPADDR=192.168.133.100
NETMASK=255.255.255.255
ONBOOT=yes
NAME=loopback
重啟網卡，啟動keepalived 顯示如下成功！
?? service network restart
?? service keepalived restart