samba - Nov 2020 - Floating IP breaks AD replication

Hi,

I have a setup with 2 DCs
which works just fine.

Since we have some legacy systems
which can't deal with 2 DNS Names
I used ctdb to manage a floating IP (in addition to the fixed IPs)
between the DCs which works great also.

But then the replication breaks
for some parts (Users still were replicated)
because the floating IP was added
to the internal DNS zone
and one of the DC tried to replicate
to itself after some failover tests.

Can I prevent somehow that the floating IP
gets added to the internal DNS zone
or what could be another approach?


-- 
Sysadmin by Nature

On 23/11/2020 15:47, Sven Wick via samba wrote:
> Hi,
>
> I have a setup with 2 DCs
> which works just fine.
>
> Since we have some legacy systems
> which can't deal with 2 DNS Names
> I used ctdb to manage a floating IP (in addition to the fixed IPs)
> between the DCs which works great also.
You cannot use CTDB with AD DCs

If your 'legacy' system cannot deal with 2 dns names (not entirely sure 
what you mean by this), then just point them at one DC.

Rowland

Maybe this is a stupid idea, but what we are doing here is using just the
domain name for all sorts of services, i.e. LDAP.
So instead of pointing a client to dc1.somedom.contoso.com or
dc2.somedom.contoso.com, we point them to somedom.contoso.com which is then
resolved to both and the client can pick.

Best regards
Johannes

Am Mo., 23. Nov. 2020 um 17:02 Uhr schrieb Rowland penny via samba <
samba at lists.samba.org>:
> On 23/11/2020 15:47, Sven Wick via samba wrote:
> > Hi,
> >
> > I have a setup with 2 DCs
> > which works just fine.
> >
> > Since we have some legacy systems
> > which can't deal with 2 DNS Names
> > I used ctdb to manage a floating IP (in addition to the fixed IPs)
> > between the DCs which works great also.
> You cannot use CTDB with AD DCs
>
> If your 'legacy' system cannot deal with 2 dns names (not entirely
sure
> what you mean by this), then just point them at one DC.
>
> Rowland
>
>
>
>
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