实际环境IP配置
192.168.19.100 负载均衡器 master
192.168.19.102 负载均衡器
192.168.19.103 web1
192.168.19.104 web2
1.在master上安装配置Keepalived:
yum install keepalived ipvsadm -y
ipvsadm安装并不启动
2.在master上修改配置文件
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id Director1 #两边不一样。
}
vrrp_instance VI_1 {
state MASTER #另外一台机器是BACKUP
interface ens33 #心跳网卡
virtual_router_id 51 #虚拟路由编号，主备要一致
priority 150 #优先级
advert_int 1 #检查间隔，单位秒
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.19.254/24 dev ens33 #VIP和工作接口
}
}
virtual_server 192.168.19.254 80 { #LVS 配置，VIP
delay_loop 3 #服务论询的时间间隔，#每隔3秒检查一次real_server状态
lb_algo rr #LVS 调度算法
lb_kind DR #LVS 集群模式
protocol TCP
real_server 192.168.19.104 80 {
weight 1
TCP_CHECK {
connect_timeout 3 #健康检查方式,连接超时时间
}
}
real_server 192.168.19.103 80 {
weight 1
TCP_CHECK {
connect_timeout 3
}
}
}
3.在backup上安装keepalived:
yum install keepalived ipvsadm -y
ipvsadm安装并不启动
4.拷贝master上的keepalived.conf到backup上：
scp 192.168.19.100:/etc/keepalived/keepalived.conf 192.168.19.102:/etc/keepalived/
5.拷贝后,修改配置文件
router_id Director2
state BACKUP
priority 100
6.master和backup上启动服务:
systemctl start keepalived
systemctl enable keepalived
7.web服务器配置，web1和web2同配置
安装web测试站点
yum install -y httpd && systemctl start httpd && systemctl enable httpd
netstat -antp | grep httpd
自定义web主页，以便观察负载均衡结果
echo web1 > /var/www/html/index.html
echo web2 > /var/www/html/index.html配置虚拟地址
cp /etc/sysconfig/network-scripts/{ifcfg-lo,ifcfg-lo:0}
vim /etc/sysconfig/network-scripts/ifcfg-lo:0
DEVICE=lo:0
IPADDR=192.168.19.254
NETMASK=255.255.255.255
ONBOOT=yes
其他行注释掉配置路由
vim /etc/rc.local
/sbin/route add -host 192.168.0.20 dev lo:0
在两台机器（RS）上，添加一个路由：route add -host 192.168.19.254 dev lo:0
确保如果请求的目标IP是$VIP，那么让出去的数据包的源地址也显示为$VIP配置ARP
# vim /etc/sysctl.conf
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.default.arp_ignore = 1
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
忽略arp请求，可以回复
reboot
8.测试：
1）观察lvs路由条目 master - ipvsadm -L
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP localhost.localdomain:http rr
-> 192.168.19.103:http Route 1 0 0
-> 192.168.19.104:http Route 1 0 0
2）观察vip地址在哪台机器上 ip a
inet 192.168.19.100/24 brd 192.168.19.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet 192.168.19.254/24 scope global secondary ens33
3）客户端浏览器访问vip
4）关闭master上的keepalived服务，再次访问vip
systemctl stop keepalived.service
5）关闭web1站点服务，再次访问VIP
systemctl stop httpd
