Configure/Update DNS Server IP Address in SDDC Manager through Command Line

Products

• VMware SDDC Manager
• VMware Cloud Foundation

Issue/Introduction

This KB Outlines the steps to configure/update DNS Server IP Address in SDDC Manager through Command Line

Environment

VCF 4.x

VCF 5.x

Resolution

To update the DNS server settings in SDDC Manager, follow these steps:

Pre-Requisite:

1. Take an Offline Snapshot:
   Before making any changes, ensure you take an offline snapshot of the SDDC Manager Virtual Machine to prevent any issues during the update.

Steps to Set DNS Server IP Address:

1. Login to SDDC Manager:
   SSH into the SDDC Manager using the vcf account.

2. Command to Update DNS Server:
   To update the DNS servers, use the following command:

   sudo /opt/vmware/share/vami/vami_set_dns DNS_Server_1 DNS_Server_2
   

   • Replace DNS_Server_1 and DNS_Server_2 with the appropriate IP addresses of your primary and secondary DNS servers.

3. Command to Update DNS Server, Domain, and Search Path:
   If you need to update the domain name, search path, and DNS servers simultaneously, use the following command:

   sudo /opt/vmware/share/vami/vami_set_dns -d domain -s searchpath DNS_Server_1 DNS_Server_2
   

   • Replace domain with the domain name and searchpath with the desired search path for DNS resolution.
   • Replace DNS_Server_1 and DNS_Server_2 with the appropriate DNS server IP addresses.

Verification:

To verify that the DNS servers have been updated, you can use the following commands:

1. Check /etc/resolv.conf:
   Run the command:

   cat /etc/resolv.conf
   

   This file should list the updated DNS servers.

2. Use the vami_dns Command:
   You can also run the following command to verify DNS settings:

   /opt/vmware/share/vami/vami_dns
   

Restart Network Name Resolution Service:

To apply the DNS changes, restart the Network Name Resolution service using:

sudo systemctl restart systemd-resolved.service

This will restart the service and apply the updated DNS configuration.

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By following these steps, you can successfully update and verify the DNS server settings in your SDDC Manager.