keepalived配置基于lvs DR模型的HA

iojsioi 发表于 2018-12-31 06:07:09

　　
基本架构图如下：
http://s4.运维网.com/wyfs02/M01/77/24/wKioL1ZkB2HxXxwCAAEk-GGAgoU809.jpg
平台环境：centos6.x
1. 安装keepalived、安装ipvsadm
yum –y install keepalivedipvsadm
2. 配置服务
2.1 lvs realserver 配置脚本
#!/bin/bash
VIP1=192.168.1.199
case "$1" in
start)
echo " start LVS of REALServer"
/sbin/ifconfig lo:0 $VIP1 broadcast $VIP1 netmask 255.255.255.255 up
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
;;
stop)
/sbin/ifconfig lo:0 down
echo "close LVS Directorserver"
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
2.2 keepalived master 配置文件
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 52
priority 100
advert_int 1
authentication {
   auth_type PASS
   auth_pass 1111
}
virtual_ipaddress {
192.168.1.199
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
virtual_server 192.168.1.199 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 50
protocol TCP
real_server 192.168.1.204 80 {
      weight 1
      HTTP_GET {
         url {
         path http://192.168.1.204/index.html
         status_code 200
         }
         connect_timeout 3
         nb_get_retry 3
         delay_before_retry 3
      }
   }
real_server 192.168.1.205 80 {
      weight 1
      HTTP_GET {
         url {
         path http://192.168.1.205/index.html
         status_code 200
         }
         connect_timeout 3
         nb_get_retry 3
         delay_before_retry 3
   }
}
}
2.3keepalived backup配置文件
! Configuration File for keepalived
global_defs {
notification_email {
   root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 52
priority 99
advert_int 1
authentication {
   auth_type PASS
   auth_pass 1111
}
virtual_ipaddress {
192.168.1.199
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
virtual_server 192.168.1.199 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 50
protocol TCP
real_server 192.168.1.204 80 {
      weight 1
      HTTP_GET {
         url {
         path http://192.168.1.204/index.html
         status_code 200
         }
         connect_timeout 3
         nb_get_retry 3
         delay_before_retry 3
      }
   }
   real_server 192.168.1.205 80 {
      weight 1
      HTTP_GET {
         url {
         path http://192.168.1.205/index.html
         status_code 200
         }
         connect_timeout 3
         nb_get_retry 3
         delay_before_retry 3
   }
}
}

　　

　　3.测试
启动服务，在master上查看ipvs规则生效状况
http://s3.运维网.com/wyfs02/M02/77/24/wKioL1ZkCCPQ-O0oAAA8DylHHEQ106.png

maill命令查看邮件
http://s1.运维网.com/wyfs02/M00/77/26/wKiom1ZkB_WRdpVvAABzuddlizE646.png

down掉master查看backup是否能成功接管

查看状态是否转换
http://s1.运维网.com/wyfs02/M01/77/25/wKioL1ZkCMKTj8N7AABSX_RoIR4544.png
　　查看ipvs规则是否生效

http://s5.运维网.com/wyfs02/M02/77/26/wKiom1ZkCFWS41OMAAA8DylHHEQ573.png
　　查看vip是否转移

http://s2.运维网.com/wyfs02/M00/77/25/wKioL1ZkCMOyTuj3AABgqbSuC6c088.png

　　

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keepalived配置基于lvs DR模型的HA