vCenter upgrade fails with message "Failed to set hostname"

Products

• VMware vCenter Server

Issue/Introduction

• vCenter upgrade might fail stage 2 with below message:
  • 
• PNID and Hostname of the vCenter will be matching in this case.

Environment

• VMware vCenter 7.0
• VMware vCenter 8.0

Cause

• In the /etc/hosts file of the vCenter, there were additional entries added with the temporary IP of the vCenter and FQDN.

Resolution

• Ensure DNS resolution is working for vCenter IP and FQDN, additionally temporary IP is reachable from vCenter 
• Edit the /etc/hosts file to remove the additional entries.
• The content should look like this after edit:

  • # VAMI_EDIT_BEGIN
    # Generated by Studio VAMI service. Do not modify manually.
    127.0.0.1  <VC_FQDN> <VC_shortname> localhost
    ::1  <VC_FQDN> <VC_shortname> localhost ipv6-localhost ipv6-loopback
    # VAMI_EDIT_END