During a recent upgrade I found that one of the ESXi hosts just would not update using Update Manager. The error I was seeing was “Cannot run upgrade script on host”.

After a bit of searching I found this article which related to ESXi 5.1 upgrade to 5.5 but the steps worked well to fix the issue I was seeing.

In order to fix the issue I performed the following steps:

Step 1: Disable HA for the cluster

Disable Cluster HA

Step 2: Go to vCenter Networking. Select the distributed vswitch and then select the hosts tab. From here, right-click on the host you need to reboot and select Remove from vSphere Distributed Switch

Remove Distributed Switch

Click Yes to remove the host from the switch.

Confirm vDS Removal

Step 3: Remove the host from the cluster

Remove ESXi host from cluster

Step 4: Enter the host into maintenance mode and then choose to reboot.

Enter Maintenance Mode
Step 5: Connect via SSH to the ESXi host and run the following commands to uninstall the FDM agent:

>
cp /opt/vmware/uninstallers/VMware-fdm-uninstall.sh /tmp
chmod +x /tmp/VMware-fdm-uninstall.sh
/tmp/VMware-fdm-uninstall.sh
>

SSH Host FDM Uninstaller
Step 6: Reboot the host

Reboot the host
Step 7: Add the ESXi host back to the cluster

rejoin host to cluster step 1

rejoin host to cluster step 2

rejoin host to cluster step 3

rejoin host to cluster step 4
Step 8: Re-add the host to the Distributed vSwitch. Go to Networking -> select the distributed vswitch. Right-click and select Manage Hosts.

Manage vDS

Select the host

Select Host

Select vnics for Uplinks to be managed by the switch

Manage vDS uplinks

Step 9: Turn vSphere HA back on for the cluster the host resides on.

Turn on vSphere HA

Step 10: Run the upgrade again from Update Manager and this time it will work.

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