keepalived 组播的配置

准备主机2台

server	hostname	ip
keepalived	s1	172.20.27.10
keepalived	s2	172.20.27.11

S1节点配置

修改keepalived配置文件

[root@s1 ~]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalivedglobal_defs {   notification_email {        root@mylinuxops.com   }   notification_email_from root@mylinuxops.com   smtp_server 127.0.0.1   smtp_connect_timeout 30   router_id s1.mylinuxops.com   vrrp_skip_check_adv_addr   vrrp_strict   vrrp_iptables   vrrp_garp_interval 0   vrrp_gna_interval 0}vrrp_instance VI_1 {    state MASTER    interface ens33    virtual_router_id 27    priority 100    advert_int 2    authentication {        auth_type PASS        auth_pass 1111    }    virtual_ipaddress {        172.20.27.100 dev ens33 label ens33:0    }}

启动服务

[root@s1 ~]# systemctl restart keepalived

查看vip是否绑定

[root@s1 ~]# ip a | grep ens33:0    inet 172.20.27.100/32 scope global ens33:0

s2节点操作

修改keepalive的配置文件

[root@s2 ~]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalivedglobal_defs {   notification_email {        root@mylinuxops.com   }   notification_email_from root@mylinuxops.com   smtp_server 127.0.0.1   smtp_connect_timeout 30   router_id s2.mylinuxops.com   vrrp_skip_check_adv_addr   vrrp_strict   vrrp_iptables   vrrp_garp_interval 0   vrrp_gna_interval 0}vrrp_instance VI_1 {    state BACKUP    interface ens33    virtual_router_id 27    priority 80    advert_int 2    authentication {        auth_type PASS        auth_pass 1111    }    virtual_ipaddress {        172.20.27.100 dev ens33 label ens33:0    }}

重启服务

[root@s2 ~]# systemctl start keepalived

抓包查看是否组播

在s1节点上抓包

[root@s1 ~]# tcpdump -i ens33:0 -nn net 224.0.0.18tcpdump: verbose output suppressed, use -v or -vv for full protocol decodelistening on ens33:0, link-type EN10MB (Ethernet), capture size 262144 bytes18:59:35.835747 IP 172.20.27.10 > 224.0.0.18: VRRPv2, Advertisement, vrid 27, prio 100, authtype simple, intvl 2s, length 2018:59:37.837171 IP 172.20.27.10 > 224.0.0.18: VRRPv2, Advertisement, vrid 27, prio 100, authtype simple, intvl 2s, length 20

抓到发往224.0.0.18的信息

测试keepalived

暂停s1的keepalived服务器查看地址是否会漂移到s2节点上

在s1节点上暂停服务

[root@s1 ~]# systemctl stop keepalived

在s2节点上查看VIP是否被移过来了

[root@s2 ~]# ifconfigens33: flags=4163
    
       mtu 1500        inet 172.20.27.11  netmask 255.255.0.0  broadcast 172.20.255.255        inet6 fe80::20c:29ff:fe4d:1ce3  prefixlen 64  scopeid 0x20
             ether 00:0c:29:4d:1c:e3  txqueuelen 1000  (Ethernet)        RX packets 21578  bytes 1824843 (1.7 MiB)        RX errors 0  dropped 0  overruns 0  frame 0        TX packets 311  bytes 28607 (27.9 KiB)        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0ens33:0: flags=4163
     
        mtu 1500        inet 172.20.27.100  netmask 255.255.255.255  broadcast 0.0.0.0        ether 00:0c:29:4d:1c:e3  txqueuelen 1000  (Ethernet)#VIP漂移到s2节点上了lo: flags=73
      
         mtu 65536        inet 127.0.0.1  netmask 255.0.0.0        inet6 ::1  prefixlen 128  scopeid 0x10
       
                loop  txqueuelen 1000  (Local Loopback)        RX packets 6  bytes 482 (482.0 B)        RX errors 0  dropped 0  overruns 0  frame 0        TX packets 6  bytes 482 (482.0 B)        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

再次启动s1节点查看是否地址是否被夺回

[root@s1 ~]# systemctl start keepalived[root@s1 ~]# ifconfigens33: flags=4163
    
       mtu 1500        inet 172.20.27.10  netmask 255.255.0.0  broadcast 172.20.255.255        inet6 fe80::20c:29ff:fec5:123c  prefixlen 64  scopeid 0x20
             ether 00:0c:29:c5:12:3c  txqueuelen 1000  (Ethernet)        RX packets 38095  bytes 2925087 (2.7 MiB)        RX errors 0  dropped 0  overruns 0  frame 0        TX packets 28612  bytes 7301619 (6.9 MiB)        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0ens33:0: flags=4163
     
        mtu 1500        inet 172.20.27.100  netmask 255.255.255.255  broadcast 0.0.0.0        ether 00:0c:29:c5:12:3c  txqueuelen 1000  (Ethernet)# VIP地址再次被抢回去lo: flags=73
      
         mtu 65536        inet 127.0.0.1  netmask 255.0.0.0        inet6 ::1  prefixlen 128  scopeid 0x10
       
                loop  txqueuelen 1000  (Local Loopback)        RX packets 2  bytes 140 (140.0 B)        RX errors 0  dropped 0  overruns 0  frame 0        TX packets 2  bytes 140 (140.0 B)        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0