Re: Split Brain recovery with haproxy/keepalived setup

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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