[Pacemaker] ifstatus OCF RA
Florian Haas
florian.haas at linbit.com
Tue Feb 22 07:54:14 UTC 2011
On 2011-02-22 00:19, Frederik Schüler wrote:
> Hi,
>
> On Monday 21 February 2011 21:29:19 Florian Haas wrote:
>>> as the various ocf:*:ping[d] incarnations don't meet my specific needs,
>>
>> May I ask why and how?
>
> ocf:pacemaker:ping works, but takes approx. 25-30s to react at all, and
> approx. 40s to complete the failover. But I need an immediate failover,
> exactly as it worked ages ago with heartbeat-2 and ipfail.
Well how about pushing down your monitor interval to something like 5
seconds, set attempts to 1, set timeout to 1, and dampen to 0? Then
basically as soon as you lose one ping, you can fail over.
>> Well, what if the link is up but there's an upstream problem?
>
> Good point, but this requirement is customer-driven. I have the cluster to
> initiate a failover as quickly as possible within the test cases.
This sounds like a good time to educate the customer that too short
failover times are more of a curse rather than a blessing. :)
> I have a working setup with ocf:pacemaker:ping, but this was rejected as being
> "too slow".
>
>> I've
>> always liked how ocf:pacemaker:ping actually monitors connectivity to an
>> upstream IP, which covers both immediate link failure and upstream
>> problems. Similar to how in active/backup bonding, you can fail over
>> based on the status of an ARP request, rather than MII link status.
>
> I just checked the redhat cluster suite: the ip.sh RA there has a monitor_link
> option, which does exactly what my ifstatus RA does.
> Maybe this functionality could be added to the IPaddr2 script, but I guess
> that wouldn't have more chances of being added than this one, correct?
Improving an existing resource agent pretty much always stands better
chances of being merged than adding a new one. That's my opinion, surely
others will correct me if theirs differ.
Cheers,
Florian
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