How to Move all APs from Primary to Secondary Controller?

[jaunasawol]

So we have 2 9800 WLCs in an N+1 configuration, and all of our APs are connected to the Primary. We are moving the primary WLC to a new data center. I had thought the easiest way to do this with as little downtime as possible would be to gradually move APs from the primary controller to the secondary before taking the primary controller offline, but I don't see an efficient way to do this through the controller or through DNA Center. The only way I can find to do it is to manually change the HA configuration, but we have roughly 1500 APs, so I would rather not have to do that one-by-one. Anyone know how we might accomplish this?

[Leo Laohoo]

Moving 1500 APs from one controller to another using GUI is mentally <EXPLETIVE>. 

I will always use CLI (with the help of an Excel spreadsheet) because it is more effective and a lot faster.  And I can do this in bulk!

ap name <NAME> controller primary <WLC NAME> <WLC IP ADDRESS>

[balaji.bandi]

i would move Manually all the AP or group of AP from Primary to Seconday (as primary) command level or GUI.