[Kea-users] HA based on galera

[Munroe Sollog]

I am running a similar configuration with other weirdness. I was told that
it is currently an unsupported configuration until version 1.4

On Tue, Mar 13, 2018 at 7:11 AM <lex at ezelink.com> wrote:

> Thanks, Dominik,
>
> I don't think the dedicated write node will help, cause mysql reports
> deadlock.
> that's probably sequential locks which are not properly adjusted.
>
> On 2018-03-13 14:37, Dominik Epple wrote:
> > Hi,
> >
> > it might help if you pick a dedicated galera write node, i.e. both of
> > your kea servers write to the same galera node at each point in time.
> > You can still configure that in a HA fashion by some active-passive
> > loadbalancer or a failover IP or something.
> >
> > The other option would be that the kea code gets adjusted for running
> > "galera-aware" but I am no expert on what exactly needs to happen
> > there. But if it can't be fixed on application level, it probably can
> > be fixed on system level by picking a dedicated write node.
> >
> > Dominik
> >
> > 2018-03-13 11:28 GMT+01:00 <lex at ezelink.com>:
> >
> >> Hi guys,
> >>
> >> I'm running 2 kea dhcp servers and connect them to galera-mysql
> >> cluster for HA.
> >> Everything is ok, but sometimes i have this message in logs:
> >>
> >> 2018-03-13 14:14:45.036 ERROR [kea-dhcp4.alloc-engine/11864]
> >> ALLOC_ENGINE_V4_ALLOC_ERROR [hwtype=1 b8:53:ac:xx:xx:xx],
> >> cid=[01:b8:53:ac:xx:xx:xx], tid=0xa56d03a4: error during attempt to
> >> allocate an IPv4 address: unable to execute for <SELECT address,
> >> hwaddr, client_id, valid_lifetime, expire, subnet_id, fqdn_fwd,
> >> fqdn_rev, hostname, state FROM lease4 WHERE client_id = ? AND
> >> subnet_id = ?>, reason: Deadlock found when trying to get lock; try
> >> restarting transaction (error code 1213)
> >>
> >> the network is relatively small - not more than 50-100 requests per
> >> second
> >>
> >> How can I get rid of these messages? Cause after getting this error,
> >> server sends NACK to client
> >> _______________________________________________
> >> Kea-users mailing list
> >> Kea-users at lists.isc.org
> >> https://lists.isc.org/mailman/listinfo/kea-users [1]
> >
> >
> >
> > Links:
> > ------
> > [1] https://lists.isc.org/mailman/listinfo/kea-users
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>
-- 
Munroe Sollog
Senior Network Engineer
munroe at lehigh.edu
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