keepalived+ip组播

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开启ip组播

centos7

centos6

keepalived安装配置

2台主机

server hostname ip
keepalived ka1 192.168.99.103
keepalived ka2 192.168.99.104

1、2台分别安装keepalived

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[ka1]$ yum -y install keepalived
[ka2]$ yum -y install keepalived

2、修改ka1的配置

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[ka1]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
       root@localhost
   }
   notification_email_from root@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka1
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_iptables
   vrrp_mcast_group4 224.100.100.100   #不写默认是224.0.0.18
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 11
    priority 100
    advert_int 1
    #nopreempt   #非抢占模式，当优先级更高的主机上线时，不会抢占为主服务器
    authentication {
        auth_type PASS
        auth_pass 123
    }
    virtual_ipaddress {
        192.168.0.100 dev eth0 label eth0:1
    }
}

3、修改ka2的配置

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! Configuration File for keepalived

global_defs {
   notification_email {
       root@localhost
   }
   notification_email_from root@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka2
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_iptables
   vrrp_mcast_group4 224.100.100.100   #不写默认是224.0.0.18
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 11
    priority 80
    advert_int 1
    #nopreempt   #非抢占模式，当优先级更高的主机上线时，不会抢占为主服务器
    authentication {
        auth_type PASS
        auth_pass 123
    }
    virtual_ipaddress {
        192.168.0.100 dev eth0 label eth0:1
    }
}

4、在ka1或ka2新开个终端准备抓包

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[ka1]$ tcpdump -i eth0 -nn net 224.100.100.100

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes

5、启动ka2的keepalived(先启动backup)

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[ka2]$ systemctl restart keepalived

抓到包了。

VIP绑定上了

6、再启动ka1的keepalived(注意看抓包)

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[ka1]$ systemctl start keepalived

可以看到，宣告的IP变成了ka1的了

VIP漂移到ka1了，因为ka1的优先级比ka2高