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POPython Socket GetAddrInfo (GAI) Error
 

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  1. POPython Socket GetAddrInfo (GAI) Error
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    <p>I'm running Python (2.7.2) on an embedded linux system has roughly this startup sequence: </p> <p>0) Reboot</p> <p>1) Wait 2 minutes</p> <p>2) Acquire network config via DHCP</p> <p>A daemon process uses <a href="http://pypi.python.org/pypi/ntplib/" rel="nofollow">ntplib</a> to acquire the current time and update its clock accordingly.</p> <pre><code>import ntplib # http://pypi.python.org/pypi/ntplib/ ... self.ntpClient = ntplib.NTPClient() ... def getDate(self): try: logging.info('Sending NTP request to %s' % ('pool.ntp.org')) response = self.ntpClient.request('pool.ntp.org') secs = time.localtime(response.tx_time) logging.info('Response returned') return secs except Exception, e: logging.exception(e) return RESULT_FAILURE </code></pre> <p>A problem arises if the daemon process begins trying to resolve address info <em>before</em> the dhcp has run (step 2). This continues to be an error even <strong>after</strong> the DHCP client has run.</p> <p>Here is the exception:</p> <pre><code>ERROR:[Errno 2] temporary failure in name resolution. Traceback (most recent call last): File "/home/root/ntp_manager/ntp_manager.py", line 34, in getDate response = self.ntpClient.request('pool.ntp.org') File "/usr/lib/python2.7/ntplib.py", line 265, in request addrinfo = socket.getaddrinfo(host, port)[0] gaierror: [Errno 2] temporary failure in name resolution. </code></pre> <p>However if the ntpClient makes its <em>first</em> attempt <em>after</em> the dhcp, then everything works fine.</p> <p>It's as if the error is a product of some sort of caching (?!)</p> <p>I've run out of ideas, some help would be much appreciated. </p> <p>Thanks</p>
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    1. COSounds like you need systemd, or openrc, or something equivalent (dependency based startup scripts).
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    2. COQuick and dirty solution: try to ping an internet host. If if works run the dhcp, otherwise sleep for a while and try to ping again.
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      1. USOttavio Campana
    3. COThanks for the suggestion guys, but I've worked out another solution that is a bit simpler.
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