Gentle shutdown feature

[Shawn Routhier]

On Jun 26, 2014, at 4:18 PM, Glenn Satchell wrote:

> On Fri, June 27, 2014 6:56 am, Kalnozols, Andris wrote:
>> 
>> On 6/26/2014 11:25 AM, Alex Bligh wrote:
>>> 
>>> On 26 Jun 2014, at 19:13, Shawn Routhier <sar at isc.org> wrote:
>>> 
>>>> 3) Any other useful comments about this issue?
>>> 
>>> I'm not using it knowingly (in my environment every
>>> lease is static so it wouldn't make a difference) but
>>> I would suggest that the new behaviour, whilst useful,
>>> would change behaviour, and thus should be 'opted in'
>>> to via a command line switch.
>> 
>> On the flip side, the orderly shutdown sounds like a good
>> idea especially on the client side if it means that sending
>> a release keep things more tidy like minimizing stale DDNS
>> records.  One could argue that if the change benefits the
>> majority, it may be more suitable to have an option for
>> the minority to opt out.  We're not using failover so these
>> changes have been transparent to us.
>> 
>> Andris
> 
> 
> There seems to be two features enables by the gentle shutdown:
> 
> 1. finish any writes to the lease file,
> 2. release lease on shutdown.
> 
> Item 1 would be desirable and I think is the expected behaviour. So no
> argument about having that.
> 
> Item 2 is a change in behaviour, and while it could be the default, a
> command to switch between this and the original might be desirable.
> Something like for the client:
> 
> release-on-shutdown true;
> 
> For the server does this try to put the server in partner-down mode when
> it shuts down? The described behaviour means a restart of the service
> could mean running with only a single server for 30 or 60 minutes (typical
> values for MCLT). I don't think that is desirable, but would be interested
> to hear what the benefits are.

This is one of the potentially un-desired items.

> 
> regards,
> -glenn
> 
> 
> 
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