Nested ESXi Virtualization

Basically, I had to test something on an ESXi upgrade procedure before putting it into production and I didn’t want to mess up my working environment.
The following is done in an ESXi 5.5 SSH console:

cd /vmfs/volumes
# cd [your volume]/[your machine name]
vi [your machine name].vmx
#make sure you have enough ram
#find and replace: memSize = "8192" with something that feets your needs ( at least 2048 though )
#find and replace or add: numvcpus = "4" and cpuid.coresPerSocket = "2" to something that meets your demands
#set guestOS = "vmkernel5" here if you don't want to manually set it through the interface and you'll nest an ESXi 5 host
monitor.virtual_mmu = "hardware"
monitor.virtual_exec = "hardware"
cpuid.1.ecx = "---- ---- ---- ---- ---- ---- --H- ----"
hypervisor.cpuid.v0 = "FALSE"
vhv.enable = "TRUE"  
sched.mem.maxmemctl = "0"
:wq
# search for your vm id
vim-cmd /vmsvc/getallvms | grep "[your machine name]"
vim-cmd /vmsvc/reload [id]

After doing this go to the machine settings in the vSphere Client and set “Options” -> “General Options” -> “Guest Operating System” to “Other” -> “VMware ESXi 5.x”
Also, be sure to have size your VM disk if you want machines in it .. AND at least 2 cores !

Enjoy.

P.S.: https://communities.vmware.com/message/2120826

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