Re: [Keepalived-devel] 2 questions on keepalived

[Dominik <po...@we...>]

A thing to add here:

> question 1 is about the option "preempt_delay" in keepalived.conf:
> 
> During my tests I just unplugged the power of a switch that connects the 
> MASTER director with the realservers. BACKUP takes over and as this one 
> is connected to another switch, my service is available - good!
> 
> When I plug the power back into the switch, MASTER falls back 
> immediately. But as the switch needs about 2 minutes to boot up, this is 
> how long none of my services are avaiable.
> 
> So from reading keealived.conf's man page, I assumed that "preempt_delay 
> 150" would tell BACKUP to wait 2 1/2 minutes until it hands over 
> services to MASTER again.
> Did I get this wrong? Because when I changed my conf and restarted 
> keepalived, the same test did the exact same thing - services fell back 
> to MASTER as soon as the link was up again.
> 
> I made sure initial state of every vrrp_instance is BACKUP (as the 
> manpage said).
> But another thing about this just to make sure:
> Does only BACKUP need the "preempt_delay" option or do both directors 
> need it and both need to start in BACKUP state (just like if you want to 
> use the nopreempt option)?

I did some more testing on this:
If I stop and start keepalived on MASTER, the delay works just fine. 
This only seems to occur on link status change.