Thinking through my process that I have outlined for a migration from 2010 to a 2013 farm...I'm looking at how I can keep users out of the farm while I do the work of converting the web application to claims mode then doing the site collection upgrade in the 2013 farm.
I've seen articles that talk about either doing no redirect or doing a DNS level redirect but i'm wondering if i can leverage the app_offline.htm process to keep users out...
Would this method cause any issues with these particular stages of my upgrade/migration? maybe this method doesn't make sense though...
Also...alternatively would there be a way to leverage hosts files on my machine and the server to keep things alive for me but not my users until we were ready to make the adjustments in DNS?