"nodename nor servname provided, or not known" for ActorSystem("multiprocTCPBase") about thespian HOT 11 CLOSED

Daniel,

This is typically caused by having an underspecified networking configuration: no specification of localhost or assignment of a hostname or domain. Unfortunately, in the current implementation there is no way to know which one, so could you please provide the results of running the following:

$ python3
>>> import socket
>>> hn = socket.gethostname()
>>> print(str(hn))
>>> fqdn = socket.getfqdn()
>>> print(str(fqdn))
>>> socket.getaddrinfo(None, 0, socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
>>> socket.getaddrinfo(hn, 0, socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
>>> socket.getaddrinfo(fqdn, 0, socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
>>> exit()
$ grep localhost /etc/hosts

I will update the code to provide more information on failure of any of the above in the future, but the above information will help diagnose this.

from thespian.

Hi Kevin,

thanks for the hint. Here is the output of the shell session on my machine:

dm@io:~ $ python3
Python 3.5.2 (default, Jun 29 2016, 13:43:58)
[GCC 4.2.1 Compatible Apple LLVM 7.3.0 (clang-703.0.31)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import socket
>>> hn = socket.gethostname()
>>> print(str(hn))
io
>>> fqdn = socket.getfqdn()
>>> print(str(fqdn))
103.1.168.192.in-addr.arpa
>>> socket.getaddrinfo(None, 0, socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
[(<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_DGRAM: 2>, 17, '', ('127.0.0.1', 0))]
>>> socket.getaddrinfo(hn, 0, socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
[(<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_DGRAM: 2>, 17, '', ('192.168.1.103', 0))]
>>> socket.getaddrinfo(fqdn, 0, socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/Cellar/python3/3.5.2/Frameworks/Python.framework/Versions/3.5/lib/python3.5/socket.py", line 732, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno 8] nodename nor servname provided, or not known
>>>
dm@io:~ $ grep localhost /etc/hosts
# localhost is used to configure the loopback interface
127.0.0.1   localhost
::1             localhost

As you can see, the line socket.getaddrinfo(fqdn, 0, socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP) seems to cause the problem that I have originally reported.

from thespian.

Hi Daniel,

It looks like your fqdn is invalid, but that shouldn't necessarily be a fatal problem for Thespian. I've pushed a commit to the Thespian repository that should just warn about this issue but attempt to continue. Please let me know if this works for you.

from thespian.

Hi Kevin, thanks for your quick fix. This worked for me.

from thespian.

Hi Kevin, do you have any plans to cut a 3.0.3 release? Rally, is nearing its first release where we use Thespian internally and I'd be great to spare users this issue. :)

from thespian.

Daniel, I should be able to get you a release sometime today. -Kevin

from thespian.

3.0.3 is released.

from thespian.

Many, many thanks Kevin for the quick release!

from thespian.

Well, this is embarrassing (on my part). I don't know how I was testing back then but unfortunately the issue is not fixed. I'll spare you further hassle and will create a PR very soon that really fixes the issue.

from thespian.

Thespian 3.0.4 is released and contains the latest update.

from thespian.

I just tested it; 3.0.4 works perfectly. Thanks again Kevin.

from thespian.