[Samba] Samaba4 clustering

Min Wai Chan dcmwai at gmail.com
Wed Oct 8 06:24:18 MDT 2014

Hi all,

Just to check

did anyone got vmware application monitoring working with Samba version 4?

Thank You.

On Tue, Sep 9, 2014 at 8:51 AM, Greg Scott <GregScott at infrasupport.com>

> True - good point!  And if it was a Samba specific cluster at the
> application layer vs. doing it at the virtualization layer, you could do a
> bunch of cool things around an active/active implementation advertising
> that virtual IP to the world.   But if I were doing it at the
> virtualization layer, I'd do it with RHEV and not VMware.  ESXi just
> doesn't give me any hardware diagnostics so when a host has a problem, it's
> a royal pain to troubleshoot.  But with a RHEV-H or RHEL host, at least I
> have some off-the-shelf tools available to me.   I'm probably off the topic
> of Samba specific clusters, but it seems like there are a few ways to get
> at least some HA benefits right now.
> -          Greg
> From: Thomas Maerz [mailto:maerz.thomas at gmail.com]
> Sent: Monday, September 08, 2014 7:11 PM
> To: Greg Scott
> Cc: Marc Muehlfeld; Dania Ramirez Moya; samba at lists.samba.org >>
> samba at lists.samba.org
> Subject: Re: [Samba] Samaba4 clustering
> Greg,
>             To join this discussion, I believe you can (and people have)
> configured LVS to work with samba servers (not sure about domain
> controllers). I'm currently doing it with FreeRadius.
> As far as VMWare goes, I have a triple ESXi HA cluster and its high
> availability, and I would present several reasons why application level
> redundancy is better.
>   *   VMWare HA failover takes time, a full boot up's worth to be precise
> (several minutes)
>   *   VMWare has another technology called FT (Fault Tolerance) that is
> instantaneous, but you have to sacrifice double resources to run it (it
> runs in sync in parallel on two computers at once using double RAM, double
> CPU and requires a dedicated network card on both hosts).
>   *   My experience with VMWare thus far is that you will experience
> issues with VMWare just like you do on hardware, they are just software
> issues and thus not as disastrous, and you have the crutches like HA (and
> SRM) to mitigate the damage.
> Thomas Maerz
> On Sep 8, 2014, at 3:27 PM, Greg Scott <GregScott at infrasupport.com<mailto:
> GregScott at infrasupport.com>> wrote:
> Why don't you join a second DC to the domain? If one fails, the others
> does the job. And while both are online, both are answering login queries,
> etc.
> I'm not a Windows admin, but I guess this is the usual way for having
> redundance for DC.
> Ya know - if there were some way for Samba to present a virtual IP Address
> that belongs to all members of a cluster, Samba may gain a functional
> advantage over a pure Windows solution.  In the Windows domain model, you
> have one or more domain controllers.  Clients use DNS SRV records to "mate"
> with a domain controller.  If my client PC mates with a domain controller
> for authentication and Kerberos tickets and that domain controller goes
> offline, I wait a long time before I go look for another domain controller
> in DNS.  But the end user only notices everything runs slowly with no clue
> why.
> So if there were a way for more than one Samba host to share a common
> database and advertise a virtual IP, then Samba could do redundancy better
> than Windows does redundancy.
> Or you could also do a Samba DC in a RHEV or VMWare virtual environment,
> so then the virtualization layer would take care of all the HA requirements.
> - Greg
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