LVS+DR+Keepalived实现方式
来源地址：http://blog.yunvi.com/html/797.html
来源内容：
一：安装配置 LVS+DR+Keepalived
http://blog.yunvi.com/wp-content/uploads/2011/08/lvs+dr+keepalved-300x225.gif
负载服务器master真实IP 192.168.1.106
负载服务器backup真实IP 192.168.1.114
负载服务器虚拟IP 192.168.1.10
后端WEB服务器IP 192.168.1.50
后端WEB服务器IP 192.168.1.60
系统：Redhat 5.4 x86 内核：2.6.18-164.el5
1.下载所需要的软件：ipvsadm keepalived
wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz
wget http://www.keepalived.org/software/keepalived-1.1.18.tar.gz
2.安装ipvsadm(负载均衡器都要配置master和backup)
A．建立内核快捷方式：
ln –s /usr/src/kernels/2.6.18-164.e15-i686 /usr/src/linux
B.解压ipvsadm，编译ipvsadm
tar zxvfipvsadm-1.24.tar.gz
cd ipvsadm-1.24
make ; make install
C.显示如下：
# /sbin/ipvsadm -v
ipvsadm v1.24 2005/12/10 (compiled with popt and IPVS v1.2.1)
则Ipvsadm安装成功
3.安装keepalived负载均衡器都要配置master和backup)
tar zxvf keepalived-1.1.18tar.gz
cd keepalived-1.1.18
./configure --prefix=/usr/local/keepalived
make ; make install
cp etc/rc.d/init.d/keepalived/etc/rc.d/init.d/
cp etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived
cp etc/keepalived/keepalived.conf/etc/keepalived/
cp sbin/keepalived /usr/sbin/
启动keepalived
service keepalived start|stop|restart
4.配置master和backup
A．开启ip_forward 转发功能：
sysctl –w net.ipv4.ip_forward = 1
B．配置keepalived.conf 配置文件
Vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
crazyunix@139.com #
}
notification_email_from crazyunix@139.com
smtp_server smtp.139.com
# smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER #备份服务器上将MASTER改为BACKUP
interface eth0 #HA监测网络接口
virtual_router_id 51#主、备机的virtual_router_id必须相同
priority 90 #主、备机取不同的优先级，主机值较大，备份机值较小
advert_int 1 #VRRP Multicast广播周期秒数
authentication {
auth_type PASS #VRRP认证方式
auth_pass 1111 #VRRP口令字
}
virtual_ipaddress {
192.168.1.10 #(如果有多个VIP，继续换行填写.)
}
}
virtual_server 192.168.1.10 80 {
delay_loop 2 #每隔2秒查询realserver状态
lb_algo rr #lvs 算法
lb_kind DR #Direct Route
persistence_timeout 50 #同一IP的连接60秒内被分配到同一台realserver
protocol TCP #用TCP协议检查realserver状态
real_server 192.168.1.50 80 {
weight 100
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.1.60 80 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
BACKUP服务器同上配置，先安装lvs再按装keepalived,仍后配置/etc/keepalived/keepalived.conf，只需将红色标示的部分改一下即可.
5.配置 VIP:
vim /etc/sysconfig/network-scripts/ifcfg-lo:0
DEVICE=lo:0
IPADDR=192.168.1.10
NETMASK=255.255.255.255
ONBOOT=yes
NAME=loopback
重启网卡，启动keepalived 显示如下成功！
6.配置ipvsadm（配置master和backup）
添加负载均衡器
/sbin/ipvsadm -A -t 192.168.1.10:80 -s rr
增加realserver
/sbin/ipvsadm -a –t 192.168.1.10:80 -r 192.168.1.50:80 -g #192.168.1.50 是真实机的ip
/sbin/ipvsadm -a –t 192.168.1.10:80 -r 192.168.1.60:80 -g #192.168.1.60 是真实机的ip
routeadd -host 192.168.1.10 dev lo:0
7.配置realserver （web1和web2）
配置vip 地址
/sbin/ifconfig lo:0 192.168.1.10 netmask 255.255.255.255 broadcast 192.168.1.10 up
route add -host 192.168.1.10 dev lo:0
8.在realserver 安装测试httpd（只为显示结果）
yum install httpd –y
service httpd start
vim /var/www/html/index.html
this is 192.168.1.50/60
http://blog.yunvi.com/wp-content/uploads/2011/08/test1-300x281.jpg
9.在master负载均衡器上查看
# ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP192.168.1.10:80 rr persistent 50
-> 192.168.1.60:80 Route 1 0 0
-> 192.168.1.50:80 Route 100 0 0
10．访问：192.168.1.10 出现一下表示安装成功http://blog.yunvi.com/wp-content/uploads/2011/08/test2-300x252.png
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