Upgrade ESXi From Version 7 to Version 8

As there is security risk in ESXi 7, it's required to upgrade it to version 8 ASAP.

I choose to do online upgrade with the following steps,

1. Shutdown all VMs
2. Eneter Maintanence Mode
3. Enable SSH

4. ssh into the ESXi, and run the following commands

   You can find the Builletin ID from the release notes.

   Bash

   esxcli network firewall ruleset set -e true -r httpClient
   
   esxcli software profile update -d https://hostupdate.vmware.com/software/VUM/PRODUCTION/main/vmw-depot-index.xml -p <Bulletin ID>
   

   It may take a while to finish the upgrade depends on your network and hardware.

5. After upgrade finished, exit the Maintanence mode.