"Failed to get management network information." error configuring vCenter HA

Products

• VMware vCenter Server

Issue/Introduction

Symptoms:

• Configuring vCenter HA fails with the error:
  
  Error: Failed to get management network information. verify if management interface (nic0) is configured correctly and is reachable
   
• Running the command /usr/sbin/prepare-vcha on the vCenter Server Appliance fails with the error:
  
  Traceback (most recent call last):
  File "/usr/sbin/prepare-vcha", line 651, in <module>
  main()
  File "/usr/sbin/prepare-vcha", line 632, in main checkIps)
  File "/usr/sbin/prepare-vcha", line 440, in setupVchaEthCfg selfFailoverIp = getIp.getIpPrfxForIface('eth0')
  File "/usr/lib/vmware-vcha/scripts/getIp.py", line 64, in getIpPrfxForIface ifaceInfo = ifaces.getIfaceInfo(iface)
  File "/usr/lib/vmware-vcha/scripts/ifaces.py", line 164, in getIfaceInfo vchaIp, vchaFqdn = iputil.getIpFqdnForEth0(skipResolveOpt)
  File "/usr/lib/vmware-vcha/scripts/iputil.py", line 200, in getIpFqdnForEth0 raise Exception('Unable to get hostname resolved IP address for eth0')|
  Exception: Unable to get hostname resolved IP address for eth0

Environment

VMware vCenter Server Appliance 6.5.x

Cause

This issue can occur due to:

• A failed reverse lookup after configuring the internal interfaces on the Passive vCenter Server Appliance.
• The hostname contains capital letters.

 

Resolution

To resolve this issue:

• Ensure the hostname contains only lower case letters.
  • Checking for upper case letters in the hostname:
  1. 1. Connect to the vCenter Server Applianc with an SSH session and root credentials.
     2. Run this command to enable access the Bash shell:
        
        shell.set --enabled true
         
     3. Type shell and press Enter.
     4. Run this command to check the hostname:
        
        cat /etc/vmware/systemname_info.json | grep -i vCenter_hostname
         
  • If the hostname returned contains upercase level modify the hostname entry in the systemname_info.json file.
  1. 1. Create a snapshot of the vCenter Server Appliance.
     2. Create a backup of the /etc/vmware/systemname_info.json file.
     3. Open the systemname_info.json file with this command:
        
        vi systemname_info.json
         
     4. Save the file and exit.
     5. Reboot the vCenter Server Appliance.
• Ensure the DNS settings for the vCenter Server and reverse lookup succeeds on the vCenter Server Appliance.
• This is also resolved in 6.5 P01