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Configuring DNS Round Robin on Windows Server for Qumulo Core

This article explains how to provide a single namespace on a cluster to configure DNS Round Robin on a Windows Server 2008 R2-based domain controller

REQUIREMENTS

  • Cluster running Qumulo Core
  • DNS server with Round Robin record support enabled for connection Balancing. Please note that you must be a member of the Domain Admins, Enterprise Admins, or the DnsAdmins group to complete this procedure. 

NOTE: DNS entries will be automatically created from the node used to add the cluster to Active Directory and can be removed without issue during configuration.

PROCESS

Prior to starting this configuration, ensure that your DNS server is enabled for Round Robin connection balancing as described below.

Confirm Round Robin Support is enabled

  • Open the DNS Manager snap-in tool by logging on to a computer where the DNS snap-in has already been installed
  • Click Start, point to Administrative Tools, and click DNS
  • Right click on DNS and go to properties
  • On the Advanced tab, verify that round robin is checked:

Add DNS entries for each RD Session Host server

  • Open the DNS snap-in by logging on to a computer where the DNS snap-in has been installed
  • Click Start, point to Administrative Tools, and then click DNS
  • Expand the server name, expand Forward Lookup Zones, and then expand the domain name
  • Right-click the appropriate zone, and then click New Host (A or AAAA)
  • Type in the Name box the host name you wish to address your Qumulo cluster by when having clients connect to it. The name will be a virtual name that clients will use to connect to the cluster. Do not use the name of an existing server.
  • Enter the first floating IP address for one of the nodes in the cluster. Note that only floating IP addresses should be used for Round Robin DNS entry.
  • Click Add Host
  • Repeat the above steps for each floating IP address used by nodes in the cluster.

Configure Time to Live (TTL) for the DNS requests to the cluster

Balancing connections across the cluster evenly is the ultimate goal of providing a single namespace to the cluster. In order to do this, it's important to ensure that the DNS server is constantly sending a different IP address for each DNS request for the cluster.

In this example, the TTL of each record will be set to 0 so that each DNS lookup for the Qumulo cluster will yield one of the four IP addresses configured.

To set the TTL on each individual A or AAA record:

  • Open the DNS snap-in by logging on to a computer where the DNS snap-in has been installed,
  • Click Start, point to Administrative Tools, and then click DNS
  • Select View from the top menus
  • Select Advanced from the menu
  • Open up any of the records created in the previous section to see additional fields that can be modified, including TTL
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1 comment

  • You should update this to remove the reference from "Add DNS entries for each RD Session Host server" and change that do Add DNS entries for each qumulo floating ip 

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