主動/被動 HA 代理：浮動 IP 不是“浮動”

我在主動/被動模式下設置 HA 代理。

haproxy-a : 172.29.240.172
haproxy-b : 172.29.240.173
Floating IP (VIP) : 172.29.240.188

在任何配置之前：

[root@haproxy-a/b ~]# cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 7.3 (Maipo)

[root@haproxy-a ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
   link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
   inet 127.0.0.1/8 scope host lo
      valid_lft forever preferred_lft forever
2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
   link/ether 00:50:56:9b:22:86 brd ff:ff:ff:ff:ff:ff
   inet 172.29.240.172/26 brd 172.29.240.191 scope global ens160
      valid_lft forever preferred_lft forever

[root@haproxy-b keepalived]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
   link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
   inet 127.0.0.1/8 scope host lo
      valid_lft forever preferred_lft forever
2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
   link/ether 00:50:56:9b:2b:a6 brd ff:ff:ff:ff:ff:ff
   inet 172.29.240.173/26 brd 172.29.240.191 scope global ens160
      valid_lft forever preferred_lft forever

我已經完成的步驟。

在兩台伺服器上配置keepalived

haproxy-a/b # yum install -y keepalived
[root@haproxy-a ~]# cat /etc/keepalived/keepalived.conf 
vrrp_script chk_haproxy {
     script "killall -0 haproxy"
     interval 1
           weight -90
     }

vrrp_instance VI_1 {
   interface ens160 #interface to monitor
       state MASTER
       virtual_router_id 51
       priority 100  # highest priority wins the election of master

   virtual_ipaddress {
     172.29.240.188
   }

   track_script {
     chk_haproxy
   }
}

[root@haproxy-b ~]# cat /etc/keepalived/keepalived.conf 
vrrp_script chk_haproxy {
     script "killall -0 haproxy"
     interval 1
           weight -10
     }

vrrp_instance VI_1 {
   interface ens160 #interface to monitor
       state BACKUP
       virtual_router_id 51
       priority 50  # highest priority wins the election of master

   virtual_ipaddress {
     172.29.240.188
   }

   track_script {
     chk_haproxy
   }
}

keepalived然後我在兩個節點上啟動服務。firewalld&iptables已停止，並且在作業系統級別上沒有更改其他配置。

一旦keepalived啟動，我看不到分配給任一系統的浮動 IP。兩個節點上的系統日誌都說：

Jul  6 13:26:51 haproxy-a Keepalived_vrrp[1862]: ip address associated with VRID not present in received packet : 172.29.240.188
Jul  6 13:26:51 haproxy-a Keepalived_vrrp[1862]: one or more VIP associated with VRID mismatch actual MASTER advert
Jul  6 13:26:51 haproxy-a Keepalived_vrrp[1862]: bogus VRRP packet received on ens160 !!!
Jul  6 13:26:51 haproxy-a Keepalived_vrrp[1862]: VRRP_Instance(VI_1) Dropping received VRRP packet...

virtual_router_idkeepalived 中的每個邏輯節點都必須在廣播域中具有自己的唯一性。

引用自：https://serverfault.com/questions/859698