DNS as a Generic Cluster Service

Discussion in 'Clustering' started by Nathan Guidry, Dec 14, 2004.

  1. Is it possible to add DNS as a Generic Service to a Cluster group?
    Nathan Guidry, Dec 14, 2004
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  2. Technically yes. Have I tried it, NO. Will I ever? NO way. Do I see a need
    to do this NO!

    If you use Active Directory Integrated DNS, then each DC will have DNS and
    you are good to go. If you are not, you should have one or more secondary
    copies (which you can click on and make primaries), so you are good to go.

    I just don't see the business need to cluster DNS, when you other supported



    MVP - Windows Server - Clustering
    http://www.nw-america.com - Clustering
    http://www.msmvps.com/clustering - Blog
    Rodney R. Fournier [MVP], Dec 14, 2004
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  3. Although I fully agree with most of your statements I would like to raise
    the following concerns...

    If I want to have high availability on DNS service...Why should I rely on
    Domain controllers? I'd rather go with a dedicated DNS server without the
    overload of being a DC

    Once said that, and bearing in mind that a user could require dedicated DNS
    service (without) not dependant on DC's...what do not make possible ( by
    default in MSCS) to clusterize DNS Service (as you can do with DHCP)?
    That way, the Primary Zone would have high availability...

    I have always wondered why MS did not DNS clustering by default...because I
    agree that AD relies on DNS...but if your intention is only to provide with
    a reliable and highly available DNS service, why mandatory DC's?

    Just my 0.02 cents....and acting as devil lawyer...
    Ramon Jiménez, Dec 15, 2004
  4. Great points, let me try and give my take on the matter...

    Note I stated that having a Primary and Secondaries would also work - those
    could be UNIX boxes :) 99.999% of the installs would never benefit from a
    dedicated DNS server. The Root servers, ISPs, etc. yes, the rest of the
    world, no way. Running on a DC in a Microsoft shop, is the way to go.
    Again why? AD integrated makes ALL the server Primaries for the zones. Way
    cool. UNIX does not have that. You want HA, use your DC's :) DNS traffic is
    about 1% of all network traffic, it won't hurt your DC's.
    My take, and this is 100% me here. 1) They don't want you too. They want and
    firmly believe that AD integrated is the way to go, all primaries are great
    HA. 2) If you could cluster DNS, many would. Seems like a DUH right? Nope,
    cause those that did many not get greater value from clustering. Having
    DC/DNS servers all over the place is a way better design for most. 3)
    Additional product to support. MS already has to do a ton of DNS support. As
    you know, everything needs DNS today, adding clustering to the mix would
    make more work for the DNS team, and to what end?
    Always buddy, these topics make us all think out of the box. Like I tell
    most of my MCT classes, in the world of Microsoft, if there is not 6 ways to
    something, it can't be done. If you already know 2 or 3, you are missing 50%
    of what is out there.
    Rodney R. Fournier [MVP], Dec 15, 2004
  5. I have only 1 DC. That is why I am asking. My 2 servers that are nodes in
    the cluster are not AD because I'm installing WUS on them which does not go
    on a server with AD. How do I cluster DNS???
    Nathan Guidry, Dec 15, 2004
  6. I am sorry, I can't give you steps for what I don't have.

    Rodney R. Fournier [MVP], Dec 15, 2004
  7. hi nathan!

    you can "cluster" it as a "generic service". so create a generic service
    resource and write the dns-server service name in the service field. then go
    to both cluster nodes and set dns server to manual. now it´s working...
    BUT... as rodney mentioned it makes no real sense for me...

    gerald aigenbauer.
    Gerald Aigenbauer, Dec 15, 2004
  8. I have been thinking more about this. If you only have 1 DC, I would worry
    about that before I even looked at clustering. If that one DC goes down, no
    Forest, Domain, or Tree. A true single point of failure.



    MVP - Windows Server - Clustering
    http://www.nw-america.com - Clustering
    http://www.msmvps.com/clustering - Blog
    Rodney R. Fournier [MVP], Dec 15, 2004
  9. Totally agree. It makes no sense having a High availability cluster
    providing any service on it if the **MAIN** authentication provider (DC) has
    no redundancy
    Ramon Jiménez, Dec 15, 2004
  10. So, when your one DC goes down, so does your cluster and you lose
    everything, right?

    I am not trying to poke holes in your environment, but one DC just doesn't
    cut it.

    There is no "best practice" that I am aware of for clustering DNS. You can
    get fault tolerance without clustering.
    Russ Kaufmann [MCT], Dec 20, 2004
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