Re: Split Brain recovery with haproxy/keepalived setup

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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