[Kea-users] Using Host Reservations in Kea

[Marcin Siodelski]

On 22.06.2016 17:24, Templin, Fred L wrote:
> Hi Marcin,
>
> > -----Original Message-----
> > From: Marcin Siodelski [mailto:marcin at isc.org]
> > Sent: Wednesday, June 22, 2016 8:17 AM
> > To: Templin, Fred L <Fred.L.Templin at boeing.com>
> > Cc: kea-users at lists.isc.org
> > Subject: Re: [Kea-users] Using Host Reservations in Kea
> >
> > Fred,
> >
> > In this example, there is one database and the two servers are connected
> > to this single database? If this is the case, I don't see why the
> > information would be inconsistent.
>
> This is the case we are interested in - many kea servers connected to the
> single database. We want that each server will then have consistent host
> reservation information for the clients that may come to them for service.
>
> This means that the site administrators will only need to add and remove
> host reservations in a single database rather than having to push the same
> information into multiple places, which I think would ease administrative
> overhead and be less prone to errors. Sounds like this should work with
> the new features kea 1.1.0 will be providing?
>
> Thanks - Fred
> fred.l.templin at boeing.com
>

Yes, this is something that Kea 1.1.0 will be providing, except that it
won't provide any tool set to manage reservations in the database (add
new reservations, delete reservations, modify existing reservations).
Those you'll need to do using your own tools or using some generic apps
like MySQL Workbench and such.

Marcin


> > If there are two servers, each talking to a different database, with
> > some sort of replication between the database instances, that falls down
> > into an issue of latency of such replication.
> >
> > Kea is already supporting out-of-pool reservations which means that
> > address being reserved will not be hijacked as a result of dynamic
> > allocation (by another client) because an instance of the Kea server
> > "thinks" that the address is available for allocation due to latency of
> > database replication/update. But, from your description I don't know if
> > that is a concern.
> >
> > Marcin
> >
> > On 22.06.2016 17:04, Templin, Fred L wrote:
> >> Hi Marcin,
> >>
> >> This is a very important feature that we will eventually want to begin
> >> using. I
> >> think the answer to this is "yes", but can multiple kea servers access
> >> and use
> >> the host reservation information in the databases simultaneously?
> >>
> >> So, if I have server A and server B which may at one time or
> another query
> >> the database for host reservation information for client C, will A
> and B
> >> be able to receive consistent host reservation information for C?
> >>
> >> Thanks - Fred
> >> fred.l.templin at boeing.com
> >>
> >>> -----Original Message-----
> >>> From: kea-users-bounces at lists.isc.org
> >> [mailto:kea-users-bounces at lists.isc.org] On Behalf Of Marcin Siodelski
> >>> Sent: Wednesday, June 22, 2016 7:57 AM
> >>> To: Kea Users List <kea-users at lists.isc.org>
> >>> Subject: [Kea-users] Using Host Reservations in Kea
> >>>
> >>> Kea Users,
> >>>
> >>> Our Kea development team is currently working on preparing Kea
> 1.1.0. A
> >>> feature which seems to be mostly interesting to many Kea users is Host
> >>> Reservations. This feature is present in Kea 1.0.0 but has its
> >>> limitations. Kea 1.1.0 will cover most of the missing functionality,
> >>> including support for storing reservations in MySQL and Postgres. The
> >>> support for using reservations stored in MySQL is almost complete and
> >>> we're currently working to add support for Postgres. We are also
> working
> >>> to update the documentation (Kea User's Guide and example
> configuration
> >>> files) to cover everything we have added since Kea 1.0.0. For now, the
> >>> existing documentation may be inaccurate in places.
> >>>
> >>> Since we receive many questions from Kea Users about using Host
> >>> Reservations feature with SQL databases, I decided to put together a
> >>> wiki page where I am showing examples of MySQL statements which can be
> >>> used to manage reservations in the database. Note, that Kea itself
> >>> doesn't currently support any commands (via command channel) to manage
> >>> reservations in the database and You need to use external tools (MySQL
> >>> clients) to manage the database content. The aforementioned wiki
> page is
> >>> available here:
> >>>
> >>> http://kea.isc.org/wiki/HostReservationsHowTo
> >>>
> >>> I am hoping that it will be useful for you while you perform
> pre-release
> >>> tests of host reservations.
> >>>
> >>> Thanks,
> >>>
> >>> Marcin Siodelski
> >>> ISC
> >>> _______________________________________________
> >>> Kea-users mailing list
> >>> Kea-users at lists.isc.org
> >>> https://lists.isc.org/mailman/listinfo/kea-users
> >>
> >>
> >
>