Re: Split Brain recovery with haproxy/keepalived setup

Thanks Todd.
Anyone else have any insight? With matching priorities it seems the IP
check should break the tie breaker.
ntohl(saddr) > ntohl(VRRP_PKT_SADDR(vrrp)




On Fri, Dec 27, 2013 at 12:29 PM, Todd Fleisher <[email protected]> wrote:

> I can't speak to that as I always set my priorities to unique values.
>
> -T
>
> On Dec 27, 2013, at 10:32 AM, T. A. Smooth wrote:
>
> Another thought, is if the priorities are the same, should it not fall
> back to comparing IP addresses?
> *ntohl(saddr) > ntohl(VRRP_PKT_SADDR(vrrp)*
>
> I figure it would failover then when it does the compare.
> -tp-
>
>
> On Fri, Dec 27, 2013 at 1:26 AM, T. A. Smooth <[email protected]>wrote:
>
>> Once two keepalived systems enter a split brain state, is it expected
>> behavior they can get out of it?
>>
>> Looking at the code it seems they should be able to once they can see
>> each others advertisements again. Even if they match priority it seems they
>> check source IP next
>> in vrrp.c
>>
>> vrrp_state_master_rx(vrrp_t * vrrp, char *buf, int buflen)
>> {
>> ##<snip>##
>>  } else if (vrrp->family == AF_INET) {
>> * if (hd->priority > vrrp->effective_priority ||*
>> *    (hd->priority == vrrp->effective_priority &&*
>> *     ntohl(saddr) > ntohl(VRRP_PKT_SADDR(vrrp)))) {*
>>  log_message(LOG_INFO, "VRRP_Instance(%s) Received higher prio advert"
>>     , vrrp->iname);
>>  if (proto == IPPROTO_IPSEC_AH) {
>> ah = (ipsec_ah_t *) (buf + sizeof(struct iphdr));
>>  log_message(LOG_INFO, "VRRP_Instance(%s) IPSEC-AH : Syncing seq_num"
>>       " - Decrement seq"
>>     , vrrp->iname);
>> vrrp->ipsecah_counter->seq_number = ntohl(ah->seq_number) - 1;
>>  vrrp->ipsecah_counter->cycle = 0;
>> }
>>  vrrp->ms_down_timer = 3 * vrrp->adver_int + VRRP_TIMER_SKEW(vrrp);
>> vrrp->wantstate = VRRP_STATE_BACK;
>>  vrrp->state = VRRP_STATE_BACK;
>> return 1;
>>  }
>> }
>>
>> Thoughts? Or is there a different line of code execution if there are two
>> Master?
>>
>> -tp-
>>
>
>
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