Missing esxupdate.log file on ESXi 4

On ESXi 4 the useful log file which logs events for updating the ESXi host is off by default, and there is no file for it in:

/var/log/vmware/esxupdate.log as used to be the case.

There is a VMware Knowledge Base article describing the process: KB1034329

In order to enable the logging and generate the esxupdate.log file, follow the steps below:

Enable Remote or Local Tech Support Mode (TSM)

Log in to the host as root

Run the command:

    chmod +w /etc/vmware/esxupdate/esxupdate.conf

which makes the config file writable

Open the file using vi editor:

    vi /etc/vmware/esxupdate/esxupdate.conf

Scroll down to the [log] section

Press the INSert key to allow changes

Add the following location to the file = line:

    /locker/db/esxupdate.log

Press ESCape

Then

    :wq!

and Enter to save the changes

The next time you run an update the file will be generated and be viewable. This change will persist across reboots.