Please whitelist cPanel in your adblocker so that you’re able to see our version release promotions, thanks!

The Community Forums

Interact with an entire community of cPanel & WHM users!

DNS cluster between 2 master servers?

Discussion in 'Bind/DNS/Nameserver' started by brettcave, Jan 10, 2007.

  1. brettcave

    brettcave Member

    Joined:
    Nov 13, 2006
    Messages:
    9
    Likes Received:
    0
    Trophy Points:
    151
    Hi,

    I have a few WHM root servers, and would like to cluster them. Each of the servers hosts its own accounts / DNS.

    Would I be able to configure cluster for these servers?

    Would 1 server then become the master for all accounts on both servers and the other a slave for all accounts, or does each server just create slave zones on the other server?

    Last question, each server has at least 2 IP's, with primary and secondary being the same server. Will setting up a cluster require all domains hosted on the server to be updated with new secondary servers?

    Thanks.
    Brett
     
    #1 brettcave, Jan 10, 2007
  2. chirpy

    chirpy Well-Known Member Verifed Vendor

    Joined:
    Jun 15, 2002
    Messages:
    13,460
    Likes Received:
    22
    Trophy Points:
    463
    Location:
    Go on, have a guess
    You can cluster them and then all servers will be configured as master zones for all the domains hosted on all servers (cPanel doesn't bother the the master/slave concept and just makes them all masters - it doesn't matter from a DNS resolution perspective). You would then need to either move the nameserver IP assignments around the servers so they are distributed to take advantage of the clustered zones or modify each domains zone to use a nameserver record on another server. The first option is probably best, i.e.:

    For example with server1 and server2 using domain.com you might have:

    ns1.domain.com - points to an IP on server1
    ns2.domain.com - points to an IP on server1

    and

    ns3.domain.com - points to an IP on server2
    ns4.domain.com - points to an IP on server2

    To take advantage of the cluster you would want:

    ns1.domain.com - points to an IP on server1
    ns2.domain.com - points to an IP on server2

    and

    ns3.domain.com - points to an IP on server1
    ns4.domain.com - points to an IP on server2

    Then change the IP assignments for the nameservers at the registrar for domain.com
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #2 chirpy, Jan 11, 2007
  3. rhenderson

    rhenderson Well-Known Member

    Joined:
    Apr 21, 2005
    Messages:
    785
    Likes Received:
    1
    Trophy Points:
    166
    Location:
    Oklahoma
    cPanel Access Level:
    Root Administrator
    I can still see it as a master/slave concept depending on your point of view and how you set the DNS on each whether it is Standalone or Synchronize Changes.

    Server one is called master.server.com and server two is called slave.server.com and setup DNS clustering between the servers. On the master.server.com make the setting in the cluster box for Synchronize Changes, then on the slave.server.com and make the setting on the DNS cluster say Stand Alone. Then all the records from master.server.com will copy to slave.server.com but not vice-versa. Whereas if I set them both to Synchronize changes then DNS for both servers will update to each other, then I guess I could see this as a Master/Master concept :D
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #3 rhenderson, Jan 11, 2007
  4. brettcave

    brettcave Member

    Joined:
    Nov 13, 2006
    Messages:
    9
    Likes Received:
    0
    Trophy Points:
    151
    Great, thanks for the input.

    I have a few servers, and configured it as suggested. Just waiting for synchronisation to update.

    rhenderson - I have set synchronise on both servers, as both servers host accounts - ie server1 has its own domains, and server2 has its own domains. Now server1 will act as a slave for server2 accounts(regardless of how the zone is configured from a technical aspect), and vice versa.

    All I need to do now is update my templates. If I update zone templates as root, will it also update for my resellers and their clients?

    Chirpy: I will use the following configuration, through templates:
    Primary: ns1.mydomain.com (server1)
    Secondary: ns3.mydomain.com (server2)

    That should work with the registrars....
     
    #4 brettcave, Jan 11, 2007
  5. brettcave

    brettcave Member

    Joined:
    Nov 13, 2006
    Messages:
    9
    Likes Received:
    0
    Trophy Points:
    151
    Just ran into a possible problem:

    This is how I have configured my servers:

    ns1.domain1 and ns2.domain1 are on server1 (S1)
    ns1.domain2 and ns2.domain2 are on server2 (S2)
    ns3.domain2 and ns4.domain2 are on server3 (S3)

    S1 synchronises with S2
    S2 synchronises with S1

    S2 also synchronises with S3
    S3 synchronises with S2

    S1 is unable to handle the load of a reseller, so I transfer all 260 of his accounts to S3 and update all records on S1 (well, A records at least). (Hence I left out the synchronisation between S1 and S3 in my cluster).
    But records go between S2, so S1 inevitable synchronises with S3 and vice versa.

    Checking the responses from the nameservers, S1 still refers to itself as SOA and S3 refers to itself. Would this stay this way (i.e. if 2 synchronising servers find an existing zone, there will be no fighting over who the true master is?)

    Also, S2 does not have any records for domains that were transferred... it refers me to root servers...
     
    #5 brettcave, Jan 11, 2007
    Last edited: Jan 11, 2007
  6. SoftDux

    SoftDux Well-Known Member

    Joined:
    May 27, 2006
    Messages:
    1,022
    Likes Received:
    4
    Trophy Points:
    168
    Location:
    Johannesburg, South Africa
    cPanel Access Level:
    Root Administrator

    This sounds like a great idea, but I have a few questions.

    I use modernbill to automatically create accounts. Now, let's say I configure modernbill to create accounts on both server1 and server2, filling them up equally, do I need to provide all 4 NS entries? And how will the cluster know which IP that domain uses?

    Secondly, does the cluster only copy over the DNS records, or the accounts as well?

    If, I want todo this with say 5 cPanel servers (thus having 10 NS IP's to work with, will each be a master of the other?
     
    #6 SoftDux, Jan 30, 2007
(You must log in or sign up to post here.)
Loading...
Similar Threads - cluster between master
  1. chonk

    DNS Cluster and moving accounts between servers

    chonk, Aug 23, 2018, in forum: Bind/DNS/Nameserver
    Replies:
    3
    Views:
    261
    cPanelLauren
    Aug 27, 2018
  2. RadWebHosting

    Setup Reverse Trust Between Servers in DNS Cluster

    RadWebHosting, Sep 13, 2017, in forum: Bind/DNS/Nameserver
    Replies:
    1
    Views:
    1,350
    cPanelMichael
    Sep 13, 2017
  3. mrl14

    Migrating Sites Between Clustered cPanel Machines

    mrl14, Aug 31, 2017, in forum: Bind/DNS/Nameserver
    Replies:
    1
    Views:
    603
    cPanelMichael
    Sep 1, 2017
  4. jmartinmds

    Control PHP Configuration Cluster?

    jmartinmds, Feb 7, 2019, in forum: EasyApache
    Replies:
    1
    Views:
    78
    cPanelLauren
    Feb 8, 2019
  5. Frankenstone

    Setup Two DNSonly to Cluster Nameservers with cPanel Server?

    Frankenstone, Jan 10, 2019, in forum: Bind/DNS/Nameserver
    Replies:
    4
    Views:
    258
    cPanelLauren
    Jan 11, 2019

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Accept Learn More...
    Dismiss Notice