[Kea-users] HA based on galera

[Dominik Epple]

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
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