maas-devel team mailing list archive

[Julian Edwards <julian.edwards@xxxxxxxxxxxxx>]

On 06/05/14 02:50, Ryan Harper wrote:
> Not sure cleanup will be enough:
> 
> - lxc containers generate random mac addresses
> - dhcpd is designed to keep all MACs around forever in case it can hand
> the same IP back to a known host

Can you elaborate on this?  The lease file is cleaned every hour or so
and expired leases are removed.

> - dhcp lease time (default is quite large, IIUC to reduce the amount of
> dhcp traffic) 
> 
> Combine this with our lab in OIL which does a new openstack deployment
> every 30 minutes 24x7, times 8 runs in parallel (and we'll increase as
> we have new customer hardware).
> 
> I don't believe there is an easy way to tell dhcpd that an lxc is done
> with its IP.  And at the rate of which lxc containers are going to be
> going up and down this could create a lot of churn on maas re-writing
> dhcpd.leases and/or restarting DHCPd.

If the LXC is shut down correctly, dhcpc will release the lease.  If the
LXC is just ripped out, then the zombie lease will exist until it expires.