I just fixed a couple boxes that didn't know what localhost was... actually they did, but it was wrong (pointing to their actual IP address, not 127.0.0.1).
Look don't mess with host files. You don't need to. Use DNS.
If you have more than one host, use DNS with Dynamic DHCP. You can reserve IP addresses so that hosts always get the same IP, you can extend lease times, you can put all kinds of things in DNS. But if you update dynamically you will always have the forward and reverse DNS correct (A record and PTR) and you won't have stupid host file troubles like I just had.
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