lvs（DR）keepalived实现高可用

实验环境&＃xff1a;

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&＃xff1a;

[root&＃64;centos-server ~]# sysctl -w net.ipv4.conf.all.send_redirects&＃61;0
net.ipv4.conf.all.send_redirects &＃61; 0
[root&＃64;centos-server ~]# sysctl -w net.ipv4.conf.default.send_redirects&＃61;0
net.ipv4.conf.default.send_redirects &＃61; 0
[root&＃64;centos-server ~]# sysctl -w net.ipv4.conf.eth2.send_redirects&＃61;0
net.ipv4.conf.eth2.send_redirects &＃61; 0
[root&＃64;centos-server ~]# service ipvsadm stop
[root&＃64;centos-server ~]# ipvsadm -A -t 192.168.150.200:80 -s rr
[root&＃64;centos-server ~]# ipvsadm -a -t 192.168.150.200:80 -r 192.168.150.129 -g -w 1
[root&＃64;centos-server ~]# ipvsadm -a -t 192.168.150.200:80 -r 192.168.150.142 -g -w 1
[root&＃64;centos-server ~]# iptable  s -I INPUT -p tcp --dport 80 -j ACCEPT
[root&＃64;centos-server ~]# service ipvsadm save

配置real server:

[root&＃64;centos-server ~]# vim /etc/sysctl.conf
net.ipv4.conf.all.arp_ignore&＃61;1
net.ipv4.conf.all.arp_announce&＃61;2
net.ipv4.conf.default.arp_ignore&＃61;1
net.ipv4.conf.default.arp_announce&＃61;2
net.ipv4.conf.lo.arp_ignore&＃61;1
net.ipv4.conf.lo.arp_announce&＃61;2
[root&＃64;centos-server ~]# sysctl -p
[root&＃64;centos-server ~]# ifconfig lo:0 192.168.150.200/32
[root&＃64;centos-server ~]# route add -host 192.168.150.200 dev lo:0
[root&＃64;centos-server ~]# setenforce 0
[root&＃64;centos-server ~]# yum install httpd
[root&＃64;centos-server ~]# service httpd start

配置keepalived&＃xff1a;

global_defs {notification_email {acassen&＃64;firewall.locfailover&＃64;firewall.locsysadmin&＃64;firewall.loc}notification_email_from Alexandre.Cassen&＃64;firewall.locsmtp_server 220.181.12.11smtp_connect_timeout 30router_id haproxy_DEVEL
}
vrrp_instance VI_1 {state MASTER    #另一端为SLAVEinterface eth3    #根据自己网卡情况而定virtual_router_id 51priority 100    #另一端为80advert_int 1authentication {auth_type PASSauth_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&＃64;centos-server ~]# service keepalived start

检测结果&＃xff1a;

查看是否正常调度&＃xff1a;

查看MASTER&＃xff0c;获得vip&＃xff1a;192.168.150.200&＃xff0c;及检查后端

查看SLAVE&＃xff0c;及检查后端服务&＃xff1a;

故障转移&＃xff1a;

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

[root&＃64;centos-server ~]# service keepalived stop

检测后端检查&＃xff1a;

停掉其中一台后端httpd

[root&＃64;centos-server ~]# service hdttp stop