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I got an interesting result if I changed the hostname when system starting the first time.
import socket print socket.getfqdn() zBX.testing print socket.gethostname() zBX.testing print socket.gethostbyaddr(socket.gethostname()) Traceback (most recent call last): File "<stdin>", line 1, in <module> socket.gaierror: [Errno -2] Name or service not known
gethostbyaddr() (and byname) need to do name server lookups - see the name service switch configuration (nsswitch.conf). How/where did you set "zBX.testing" as the hostname? I would get the same result if I use:
print socket.gethostbyaddr("zBX.testing") Traceback (most recent call last): File "<stdin>", line 1, in <module> socket.gaierror: [Errno -2] Name or service not known
John
But my /etc/hosts was not changed (just as default),
# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
Just the system with default hostname was changed from localhost.localdomain into others could happened that. If we use getfqdn() that situation would not occur. But I still don't know the reason why the error happened.
Thanks, Xu Wang