I am going to be replacing system X with system Y (which is much faster, newer).

I will load up the new system from scratch, and then just copy over the user 
data from the old system.  Then I will turn off the old system for good, and 
set the IP and hostname of the new system to match the old one.

Easy.  Except everyones ssh connections will complain loudly about potential 
MITM attacks, etc. ...

So, am I correct that I can just tar up /etc/ssh on the old system and use it 
to overwrite /etc/ssh on the new system, and that's that ?  No warning message 
or other problems ?

ALSO, am I correct that if I copy over their home directories that contain 
their ~/.ssh/authorized_keys that those will continue to work just fine even 
though they are on a new server ?

I guess as far as remote users are concerned, it _won't_ be a new system - 
since hostname, IP, and host ssh keys will be the same ... but I like to be 
careful and that is why I am asking for a sanity check here...

All comments appreciated.  Thanks.

 
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