Upgrading from ESXi 5.5 to ESXi 5.5 U1 can be done with ESXCLI, limited to minor versions of the upgrade. If you upgrade across a large version, use update management to upgrade or reinstall ESXi5.5 U1.
The procedure is as follows:
1. Download the corresponding Zip upgrade patch package from VMware website, Patch:
Https://www.vmware.com/patchmgr/findPatch.portal
2. Upload the upgrade patch package to ESXi storage via FTP tool;
3, the ESXi host into the maintenance mode, it is best to migrate the virtual machine to other host, to avoid the problem of virtual machine;
4. Use command ESXCLI software Vib install-d=/vmfs/volumes/53c3f193-651a14ac-e401-40f2e99d4fb2/update-from-esxi5.5-5.5_ Update01.zip
Of course, if you use a different upgrade package, you need to change the name
5, after the successful update, this time need to restart the ESXi server;
6, enter # Reboot, restart the ESXi host;
7, check whether the corresponding version number is updated successfully;
Note: You need exsi to open the CLI.
This article is from the "Flying Pig" blog, please be sure to keep this source http://thinkpig007.blog.51cto.com/971471/1586523
ESXI5.5 upgrade to ESXI5.5 Update 1 method