Modifying the DNS settings of Aria Operations for Logs

Products

• VCF Operations/Automation (formerly VMware Aria Suite)

Issue/Introduction

This article provides steps to modify the domain name system resolution settings of the Aria Operations for Logs Virtual Appliance.

Environment

VMware Aria Operations for Logs 8.18.x

VMware Aria Operations for Logs 8.16.x

The steps in this KB is only suitable for 8.16 and 8.18

Resolution

Mandatory: Take a Snapshot
Before proceeding, take a snapshot of the Aria Operations for Logs appliances as per KB: How to take a Snapshot of VMware Aria Operations for Logs

 

1. Log in to the primary node as root via SSH or vSphere console.
   
   
2. Open the network configuration file for editing.
   

   vi /etc/systemd/network/10-eth0.network

3. Update the DNS server IP addresses(es) on the lines beginning with DNS=
   (If no lines start with DNS=, add them within the [Network] section).  To modify the search domain append the domain to the Domains= setting.  If the line doesn't exist add the setting above the DNS settings like the example.
   
   Note: Aria Operations for Logs does not support using more than 2 DNS servers
   
   To use 2 DNS servers, there should be 2 lines in the 10-eth0.network file starting with DNS=
   
   Example
   

   [Match]
   Name=eth0
   
   [Network]
   Address=10.1.1.100/24
   Gateway=10.1.1.1
   Domains=<search domain>
   DNS=10.1.1.253
   DNS=10.1.1.254

4. Save the file and exit
   

   :wq

5. Delete legacy entries from resolved.conf
   

   sed -i '/^DNS=.*/d' /etc/systemd/resolved.conf

   Note: If you are trying to change a "Domain Search" settings; you may also need to use vi to remove the entries from "Domains" within the resolved.conf file, manually
6. Restart services for changes to apply
   

   systemctl restart systemd-networkd
   systemctl restart systemd-resolved

   Repeat steps 1-6 on all other nodes in the Aria Operations for Logs cluster one by one, performing the steps on the node with the ILB present last
   
   Note: The node with the ILB can be determined from the Administration -> Cluster page and will show as Node Name (ILB) where Node Name is the IP or FQDN of the node. 
   
   

7. To make the changes effective, please follow the sequence for powering off and powering on the Aria Operations for Logs nodes:

   Power Off Sequence:

   1. Power off the Worker Node(s)

   2. Power off the Primary Node

   Power On Sequence:

   1. Power on the Primary Node

   2. Power on the Worker Node(s)