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keepalived-vrrp-非抢占模式（nopreempt)

IT知识keepalived

智慧并不产生于学历,而是来自对于知识的终生不懈的追求。这篇文章主要讲述keepalived-vrrp-非抢占模式（nopreempt)相关的知识，希望能为你提供帮助。
1.两台主机都设置为BACKUP模式
[root@localhost keepalived1]# cat keepalived.conf
! Configuration File for keepalived
global_defs
  notification_email
    acassen@firewall.loc
    failover@firewall.loc
    sysadmin@firewall.loc
 
  notification_email_from Alexandre.Cassen@firewall.loc
  smtp_server 192.168.200.1
  smtp_connect_timeout 30
  router_id LVS_DEVEL
  vrrp_skip_check_adv_addr
  vrrp_iptables     
  vrrp_strict
  vrrp_garp_interval 0
  vrrp_gna_interval 0



vrrp_instance VIP1
    state BACKUP   #BACKUP模式
    interface ens192
    virtual_router_id 51
    priority 100
    nopreempt   #非抢占模式
    advert_int 1
    authentication
        auth_type PASS
        auth_pass 1111
   
    virtual_ipaddress
        172.16.116.99 dev ens192 label ens192:0
   

[root@localhost keepalived1]#
【keepalived-vrrp-非抢占模式（nopreempt)】

[root@localhost keepalived2]# cat keepalived.conf
! Configuration File for keepalived
global_defs
  notification_email
    acassen@firewall.loc
    failover@firewall.loc
    sysadmin@firewall.loc
 
  notification_email_from Alexandre.Cassen@firewall.loc
  smtp_server 192.168.200.1
  smtp_connect_timeout 30
  router_id LVS_DEVEL
  vrrp_skip_check_adv_addr
  vrrp_iptables
  vrrp_strict
  vrrp_garp_interval 0
  vrrp_gna_interval 0

vrrp_instance VIP1
    state BACKUP
    interface ens192
    virtual_router_id 51
    priority 90
    nopreempt           #非抢占模式
    advert_int 1
    authentication
        auth_type PASS
        auth_pass 1111
   
    virtual_ipaddress
        172.16.116.99 dev ens192 label ens192:0
   

[root@localhost keepalived2]# 


验证结果：
[root@localhost keepalived1]#systemctl stop keepalived
[root@localhost keepalived1]#ip  add
1: lo: < LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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
    inet6 ::1/128 scope host  
      valid_lft forever preferred_lft forever
2: ens192: < BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:50:56:95:c0:20 brd ff:ff:ff:ff:ff:ff
    inet 172.16.116.91/24 brd 172.16.116.255 scope global noprefixroute ens192
      valid_lft forever preferred_lft forever
    inet6 fe80::8f54:3d46:7596:9ff2/64 scope link noprefixroute  
      valid_lft forever preferred_lft forever
[root@localhost keepalived2]# ip add
1: lo: < LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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
    inet6 ::1/128 scope host  
      valid_lft forever preferred_lft forever
2: ens192: < BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:50:56:95:06:4e brd ff:ff:ff:ff:ff:ff
    inet 172.16.116.92/24 brd 172.16.116.255 scope global noprefixroute ens192
      valid_lft forever preferred_lft forever
    inet 172.16.116.99/32 scope global ens192:0
      valid_lft forever preferred_lft forever
    inet6 fe80::d0a1:6048:8a33:73be/64 scope link noprefixroute  
      valid_lft forever preferred_lft forever
[root@localhost keepalived1]#systemctl start keepalived    #重启开启主机1的服务，确认vip会发生漂移不？
?
[root@localhost keepalived]# tcpdump -i ens192 -nn host 224.0.0.18      #组播模式，默认组播地址为224.0.0.18
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ens192, link-type EN10MB (Ethernet), capture size 262144 bytes
16:10:04.450719 IP 172.16.116.92 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 90, authtype simple, intvl 1s, length 20
16:10:05.451816 IP 172.16.116.92 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 90, authtype simple, intvl 1s, length 20
16:10:06.452915 IP 172.16.116.92 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 90, authtype simple, intvl 1s, length 20
16:10:07.454039 IP 172.16.116.92 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 90, authtype simple, intvl 1s, length 20
16:10:08.455124 IP 172.16.116.92 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 90, authtype simple, intvl 1s, length 20
16:10:09.456199 IP 172.16.116.92 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 90, authtype simple, intvl 1s, length 20





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