之前 web 开发是经常需要修改 hosts ，稍微有点麻烦。
以后 web 本地开发就用这个域名了，hosts 都懒得改了。
ubuntu-20:~$ ping fastadmin.fbi.com
PING fastadmin.fbi.com (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.015 ms
64 bytes from localhost (127.0.0.1): icmp_seq=2 ttl=64 time=0.071 ms
64 bytes from localhost (127.0.0.1): icmp_seq=3 ttl=64 time=0.032 ms
64 bytes from localhost (127.0.0.1): icmp_seq=4 ttl=64 time=0.029 ms
64 bytes from localhost (127.0.0.1): icmp_seq=5 ttl=64 time=0.074 ms
[*.]fbi.com 都是指向 127.0.0.1
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