XorMon NG uses vCenter REST API access via read-only user
Create a user xormon on each vCenter with read-only role.
It must be the global one (like below lpar2rrd user in xorux.com domain)
Assign xormon@xorux.com user read-only role
Allow access from the XorMon NG host to vCenter on port 443 TCP (https).
Installation of VMware Perl SDK from the UI (not needed since XorMon NG v1.6.0+)
Download Linux VMware Perl SDK 7.x in tar.gz format either from the the VMware site or from XorMon NG site
Load it: UI ➡ Settins ➡ Device ➡ Server Virtualization ➡ VMware
Define VMware hosts (vCenter) in the XorMon NG UI:
Settings ➡ Device ➡ Server Virtualization ➡ VMware ➡ New ➡ place credentials (username in format: xormon@your_domain)
Run "Test" for the vCenter, it must show "OK"
Wait about 1 hour, then refresh the web browser cache by Ctrl-F5