Listen on all IPs for all vhosts
Let the webserver for all vhosts listen on all IPs on a server. With Apache httpd you can use * instead of the IP (or list all IPs on a server). This would make it easier to migrate users between servers without having to manually check the IP to update the (external) DNS. This would also make it possible to prepare everything for IPv6 at the same time as you would only need to add AAAA records after this step.
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