[Samba] Turning one DC down for a day

[gabben]

You’ll need to manage your DHCP cluster carefully. There a time out windows in the cluster failure modes and the DHCP server that is on will likely stop serving lease renewals for the downed partner after 30 minutes (or whatever is configured in your conf).



> On Nov 17, 2020, at 2:08 AM, Stefan G. Weichinger via samba <samba at lists.samba.org> wrote:
> 
> Am 16.11.20 um 19:42 schrieb Andrew Walker:
> 
>> Depending on how many clients there are in the environment, you may wish to double-check that the server you're taking down isn't the only configured nameserver for them. These sorts of exercises are the times when you realize that the server you're taking down has some software on it that's absolutely critical to the environment :))
> 
> Thanks for the pointer. Checked my DHCP-cluster right now, looks good.
> 
>> If you have time to test beforehand, do so during something like a maintenance window (i.e. after people leave work) to make sure that nothing critical goes down. Maybe also check for Samba shares, NFS exports, or other things that are being hosted on the DC in question. I know it's not a great idea to do this, but sometimes things happen if there's more than one cook in the kitchen. :))
> 
> The rebuild of the network was cancelled this week because of Covid-related issues: they have *more* work now and can't risk the downtime right now (not even the planned "one floor only mode" day).
> 
> So I have more time to plan and test.
> 
> I might plan that maintenance window, and turn off DC1, yes.
> 
> No relevant shares on that machine, only one for me, the admin ...
> 
> 
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