keepalived高可用集群（4）示例2 – keepalived + lvs集群

yum install keepalived  ipvsadm -y
ipvsadm安装并不启动

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
      }
    }
}

yum install keepalived   ipvsadm -y
ipvsadm安装并不启动

scp  192.168.19.100:/etc/keepalived/keepalived.conf 192.168.19.102:/etc/keepalived/

router_id Director2
state  BACKUP
priority 100

systemctl start keepalived
systemctl enable keepalived

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

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

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

systemctl stop keepalived.service

systemctl stop httpd