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  • 搭建keepalived遇到的问题

    搭建keepalived遇到的问题

    主机192.168.100.10

    备机192.168.100.20

    VIP192.168.100.30

    一.防火墙开启后双机都是master。

    在搭建之后开启防火墙发现双机日志都是MASTER

    1 Aug 29 12:58:17 localhost Keepalived_vrrp[18365]: VRRP_Instance(VI_1) Transition to MASTER STATE
    2 Aug 29 12:58:18 localhost Keepalived_vrrp[18365]: VRRP_Instance(VI_1) Entering MASTER STATE
    3 Aug 29 12:58:18 localhost Keepalived_vrrp[18365]: VRRP_Instance(VI_1) setting protocol VIPs.
    4 Aug 29 12:58:18 localhost Keepalived_vrrp[18365]: VRRP_Instance(VI_1) Sending gratuitous ARPs on em1 for 192.168.100.30
    5 Aug 29 12:58:18 localhost Keepalived_healthcheckers[18364]: Netlink reflector reports IP 192.168.100.30 added
    6 Aug 29 12:58:23 localhost Keepalived_vrrp[18365]: VRRP_Instance(VI_1) Sending gratuitous ARPs on em1 for     192.168.100.30

    通过查看VRRP通信原理发现VRRP基于报文实现的。master设置一定时间发送一个报文给backup如果backup没有收到就自己成为master。可推出导致问题的原因是因为backup没有收到文

    所以自己成为了master。

    VRRP控制报文只有一种:VRRP通告(advertisement)。它使用IP多播数据包进行封装,组地址为224.0.0.18,发布范围只限于同一局域网内。这保证了VRID在不同网络中可以重复使用。为了减少网络带宽消耗只有主控路由器才可以周期性的发送VRRP通告报文。备份路由器在连续三个通告间隔内收不到VRRP或收到优先级为0的通告后启动新的一轮VRRP选举。

     1 vrrp_instance VI_1 {
     2     state BACKUP
     3     interface em1
     4     virtual_router_id 51
     5     priority 50
     6     advert_int 1 #VRRP报文的发送间隔
     7     authentication {
     8         auth_type PASS
     9         auth_pass admin
    10     }
    11     virtual_ipaddress {
    12        192.168.100.30 dev em1
    13     }

     在iptables上设置。

     1 vim /etc/sysconfig/iptables

    2 添加-A INPUT -p vrrp -j ACCEPT 

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  • 原文地址:https://www.cnblogs.com/weiji100/p/3944791.html
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