实验环境：

ipvsadm-1.26-4.el6.x86_64

system:centos-6.6.x86_64

kernel:2.6.32-504.el6.x86_64 

keepalived-1.2.13-4.el6.x86_64

配置DR：

[root@centos-server ~]# sysctl -w net.ipv4.conf.all.send_redirects=0
net.ipv4.conf.all.send_redirects = 0
[root@centos-server ~]# sysctl -w net.ipv4.conf.default.send_redirects=0
net.ipv4.conf.default.send_redirects = 0
[root@centos-server ~]# sysctl -w net.ipv4.conf.eth2.send_redirects=0
net.ipv4.conf.eth2.send_redirects = 0
[root@centos-server ~]# service ipvsadm stop
[root@centos-server ~]# ipvsadm -A -t 192.168.150.200:80 -s rr
[root@centos-server ~]# ipvsadm -a -t 192.168.150.200:80 -r 192.168.150.129 -g -w 1
[root@centos-server ~]# ipvsadm -a -t 192.168.150.200:80 -r 192.168.150.142 -g -w 1
[root@centos-server ~]# iptable  s -I INPUT -p tcp --dport 80 -j ACCEPT
[root@centos-server ~]# service ipvsadm save

配置real server:

[root@centos-server ~]# 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
[root@centos-server ~]# sysctl -p
[root@centos-server ~]# ifconfig lo:0 192.168.150.200/32
[root@centos-server ~]# route add -host 192.168.150.200 dev lo:0
[root@centos-server ~]# setenforce 0
[root@centos-server ~]# yum install httpd
[root@centos-server ~]# service httpd start

配置keepalived：

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 220.181.12.11
   smtp_connect_timeout 30
   router_id haproxy_DEVEL
}
vrrp_instance VI_1 {
    state MASTER    #另一端为SLAVE
    interface eth3    #根据自己网卡情况而定
    virtual_router_id 51
    priority 100    #另一端为80
    advert_int 1
    
    authentication {
        auth_type PASS
        auth_pass 1234
    }
  
   virtual_ipaddress {
        192.168.150.200/24 dev eth3
    
    }
}
virtual_server 192.168.150.200/24 80 {   
    delay_loop 6   
    lb_algo rr   
    lb_kind DR   
    persistence_timeout 50   
    protocol TCP   
  
    real_server 192.168.150.129 80 {   
        weight 3   
        TCP_CHECK {   
        connect_timeout 10   
        nb_get_retry 3   
        delay_before_retry 3   
        connect_port 80   
        }   
}
   real_server 192.168.150.142 80 {   
        weight 3   
        TCP_CHECK {   
        connect_timeout 10   
        nb_get_retry 3   
        delay_before_retry 3   
        connect_port 80   
        }   
  
    }   
}
[root@centos-server ~]# service keepalived start

检测结果：

查看是否正常调度：

查看MASTER，获得vip：192.168.150.200，及检查后端

查看SLAVE，及检查后端服务：

故障转移：

停掉MASTER的keepalived,查看SLAVE是否自动切换为MASTER

[root@centos-server ~]# service keepalived stop

检测后端检查：

停掉其中一台后端httpd

[root@centos-server ~]# service hdttp stop

本文出自 “龙爱雪琪” 博客，请务必保留此出处http://dragon123.blog.51cto.com/9152073/1602333

lvs-keepalived实现高可用