Linux Controller adopts and forgets
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I just moved from a Windows based controller to a CentOS 7 based controller. Now whenever I adopt an access point (First AP attempted is EAP225-Oudoor with latest firmware), the controller adopts it, and start "Provisioning". Then it goes back to "Pending". The log tab reports that the AP "connected to LAN" and then reports that the AP "was forgotten". I have tried logging into the AP and resetting it. I have also gone to the AP and reset it via the reset button on the device.
If it matters:
There are only 2 APs on the network. The other is an EAP245, and still holds the config from the Windows controller (which is off at the moment).
I just don't know where to look for more details or what to do.
@GaKoppel. great it works now. I had set up CentOS 8 in a virtual box, but it seems that it lacks support for jsvc, so I considered to set up CentOS 7 next - I always wanted to take a look at CentOS anyway, seems like this is a pretty cool descendant of RedHat Linux. 
But note that Omada Controller should not run on a device connected wirelessly to the EAPs, it should run on a system which has a wired network connection. Then Omada controller ensures that only one controller is running in the same LAN. During migration you just could turn off the old controller while configuring the new controller.