During async patching of NSX-T 3.1.3.7.4 on VCF 4.4 and newer, NSX-T host upgrade can fail with precheck error

Products

• VMware Cloud Foundation
• VMware vSphere ESXi
• VMware NSX

Issue/Introduction

Symptoms:

During upgrade of NSX-T through the SDDC UI, precheck fails with error:

"Checks if IPFIX was enabled: [IPFIX is enabled. Host will be rebooted during upgrade]"

Environment

VMware NSX-T Data Center
VMware vSphere ESXi 7.0.3
VMware Cloud Foundation 4.4
VMware NSX-T Data Center 3.x

Cause

This occurs during customer async patching.
NSX-T host upgrade can fail with precheck error mentioned in nsxt-ipfix module fails to unload during the NSX-T host upgrade.. Customers are advised that this can be ignored by NSX-T solution mentioned in the KB, but VCF automatically fails due to precheck error.

Resolution

By default, VCF will not want to ignore NSX precheck warnings

This is fixed in VCF 4.4.1 

Workaround:

To workaround the issue, please follow the below mentioned steps:

1. Open an SSH session to the SDDC Manager VM and switch to the root user:

 # su

2. Navigate to /opt/vmware/vcf/lcm/lcm-app/conf/

# cd /opt/vmware/vcf/lcm/lcm-app/conf

3. In application-prod.properties add the following the timeout value as below:

# lcm.nsxt.suppress.prechecks=true

4. Restart the LCM service.

# systemctl restart lcm