KeepAlived VRID mismatch [Dropping received VRRP packet]

문서의 이전 판입니다!

KeepAlived VRID mismatch
VRID : virtual_router_id

message log에 아래 로그가 출력되기 시작함.

/var/log/message

Keepalived_vrrp[xxxx]: ip address associated with VRID not present in received packet : 192.168.17.100
Keepalived_vrrp[xxxx]: one or more VIP associated with VRID mismatch actual MASTER advert
Keepalived_vrrp[xxxx]: bogus VRRP packet received on eth0 !!!
Keepalived_vrrp[xxxx]: VRRP_Instance(VI_1) Dropping received VRRP packet...

Openstack의 경우 컨트롤 노드의 /var/log/messages 에 아래처럼 로그가 출력됨

Jul 10 17:28:35 openstackctrl-02 docker[3922]: Mon Jul 10 17:28:35 2023: (kolla_internal_vip_51) ip address associated with VRID 51 not present in MASTER advert : 10.8.6.34
Jul 10 17:28:36 openstackctrl-02 docker[3922]: Mon Jul 10 17:28:36 2023: (kolla_internal_vip_51) Entering MASTER STATE
Jul 10 17:28:36 openstackctrl-02 docker[3922]: Mon Jul 10 17:28:36 2023: (kolla_internal_vip_51) Master received advert from 10.8.6.33 with higher priority 3, ours 2
Jul 10 17:28:36 openstackctrl-02 docker[3922]: Mon Jul 10 17:28:36 2023: (kolla_internal_vip_51) Entering BACKUP STATE
Jul 10 17:28:37 openstackctrl-02 docker[3922]: Mon Jul 10 17:28:37 2023: (kolla_internal_vip_51) ip address associated with VRID 51 not present in MASTER advert : 10.8.6.34
Jul 10 17:28:38 openstackctrl-02 docker[3922]: Mon Jul 10 17:28:38 2023: (kolla_internal_vip_51) ip address associated with VRID 51 not present in MASTER advert : 10.8.6.34
Jul 10 17:28:39 openstackctrl-02 docker[3922]: Mon Jul 10 17:28:39 2023: (kolla_internal_vip_51) ip address associated with VRID 51 not present in MASTER advert : 10.8.6.34

위 로그는 openstackctrl-02 에서 해당 오픈스택의 VIP인 10.8.6.34 VRID 51에 대한 MASTER의 advert를 제대로 수신하지 못했다는 로그이다.
하지만 분명 다른 컨트롤 노드에 해당 VIP가 동작하고 있는것이 확인된 경우 보통 같은 네트워크상에 동일한 VRID의 다른 VIP가 동작하고 있기 때문이다.

동일한 VRID 를 사용하는 KeepAlived 가 같은 네트워크에 존재하고 있어서 발생
(VIP 가 다르고 VRID 가 동일한 상황)
ex> VIP 192.168.17.100 → VRID 20

  VIP 192.168.17.150 -> VRID 20

KeepAlived 가 동작하는 서버에서 tcpdump 를 이용해서 vrid 확인

# tcpdump -i eth0 host 224.0.0.18

10:59:10.697847 IP 192.168.17.100 > vrrp.mcast.net: VRRPv2, Advertisement, vrid 20, prio 100, authtype simple, intvl 1s, length 20
10:59:10.698571 IP 192.168.17.150 > vrrp.mcast.net: VRRPv2, Advertisement, vrid 20, prio 100, authtype simple, intvl 1s, length 20