Changing DNS servers

If you want to change the DNS server, you must first change the information in your new DNS server to set up the DNS wildcard for Cloud Pak for Data System.

Before you begin

Ensure that you have:
  • FQDN of the application network
  • IP address (floating_ip) of the application network
  • IP addresses of the new DNS servers

Procedure

On the DNS server:

  1. Set up the application network zone of the Cloud Pak for Data System on the new DNS servers in the customer network by following Setting up a wildcard DNS entry prior to support making any changes:
    1. Set up an A record mapping the FQDN and floating IP of the Cloud Pak for Data System application network.
    2. Add a wildcard record mapping to the A record of the Cloud Pak for Data System application network.

On Cloud Pak for Data System:

  1. Connect to e1n1 by using the application floating IP.
  2. Update the dns_servers value in the .yml file by following DNS servers section.
  3. Validate the YAML file.
  4. Test the YAML file and run the playbooks. Check if any errors occurred.
  5. Optional: Run: 
    /opt/ibm/appliance/platform/apos-comms/tools/aposDnsCheck.py
    to confirm that it passes.
  6. Verify access to the new FQDN from an external network.