[Bug 548885] Re: ntp host name not found error

[Barry Fishman]

C de-Avillez <hggdh2 at gmail.com> writes:

> Thank you for opening this bug and helping make Ubuntu better. If I
> understand you correctly, this is not a NTP problem -- you seem to be
> having an issue with name resolution (DNS), not NTP.
>
> Please check your DNS setup.
>
> ** Changed in: ntp (Ubuntu)
>    Importance: Undecided => Low
>
> ** Changed in: ntp (Ubuntu)
>        Status: New => Incomplete

DNS seems to work with everything else I've tried.  Firefox,
chromium-browser, dig, gethostip, emacs/gnus, even ntpdate.
If I could find another program that failed I would use that for
testing. 

With ntpd stopped:

$ ntpdate ntp.ubuntu.com
27 Mar 14:16:46 ntpdate[22200]: adjust time server 91.189.94.4 offset 0.000613 sec
$ ntpdate 0.pool.ntp.org
27 Mar 14:16:59 ntpdate[22201]: adjust time server 69.94.105.81 offset -0.000226 sec
$ ntpdate 1.pool.ntp.org
27 Mar 14:17:06 ntpdate[22206]: adjust time server 4.79.132.217 offset -0.001346 sec
$ ntpdate 2.pool.ntp.org
27 Mar 14:17:12 ntpdate[22207]: adjust time server 208.53.158.34 offset 0.009339 sec
$ ntpdate pool.ntp.org
27 Mar 14:17:20 ntpdate[22208]: adjust time server 72.167.54.201 offset 0.006475 sec

With ntpd started:

$ ntpq
ntpq> peers
No association ID's returned
ntpq> host ntp.ubuntu.com
current host set to ntp.ubuntu.com
ntpq> peers
ntp.ubuntu.com: timed out, nothing received
***Request timed out
ntpq> host 0.pool.ntp.org
current host set to 0.pool.ntp.org
ntpq> peers
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*clock.fmt.he.ne .PPS.            1 u  226 1024  377    0.282    0.138   0.125
+clock.sjc.he.ne .CDMA.           1 u  572 1024  377    1.793    0.117   0.878
+clepsydra.dec.c .GPS.            1 u  246 1024  377    0.998    0.106   0.331
-nist1.symmetric .ACTS.           1 u  207 1024  377    5.771    2.650   0.198
-time-A.timefreq .ACTS.           1 u  557 1024  377   43.445   -2.132   0.232
-clock.xmission. .GPS.            1 u  227 1024  377   18.184   -0.026   0.003
ntpq> host 1.pool.ntp.org
current host set to 1.pool.ntp.org
ntpq> peers
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 ntp1.csl.tjhsst 192.5.41.40      2 u  318 1024  377    0.170   -0.586   1.770
*ntp0.usno.navy. .USNO.           1 u  363 1024  377   20.175   -2.152   0.252
+ntp.alaska.edu  .GPS.            1 u  283 1024  377  123.193    2.198   0.957
+clock.isc.org   .GPS.            1 u  368 1024  377   72.917    0.836   0.592
 18.18.1.95      .STEP.          16 u    - 1024    0    0.000    0.000   0.000
 LOCAL(1)        .LOCL.          10 l   64   64  377    0.000    0.000   0.001
ntpq> host 2.pool.ntp.org
current host set to 2.pool.ntp.org
ntpq> peers
2.pool.ntp.org: timed out, nothing received
***Request timed out
ntpq> host pool.ntp.org
current host set to pool.ntp.org
ntpq> peers
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*clock.fmt.he.ne .PPS.            1 u  343 1024  377    0.282    0.138   0.125
+clock.sjc.he.ne .CDMA.           1 u  689 1024  377    1.793    0.117   0.878
+clepsydra.dec.c .GPS.            1 u  363 1024  377    0.998    0.106   0.331
-nist1.symmetric .ACTS.           1 u  324 1024  377    5.771    2.650   0.198
-time-A.timefreq .ACTS.           1 u  674 1024  377   43.445   -2.132   0.232
-clock.xmission. .GPS.            1 u  343 1024  377   18.184   -0.026   0.003
ntpq> quit

I tries a strace but did not see anyting I could understand.



I tried building the upstream ntp-4.2.6 and installed it under
"/home/util64/ntp-4.2.6/".  When I ran it from the command line (as
root) or as a soft link from /usr/sbin/ it seemed to work (the strace
showed periodic connection to the right servers).  However if I moved
lucid's ntpd out of the way replacing /usr/sbin/ntpd with the new
version, and restarted the ntp service, I got the a similar problem; the
syslog indicting first a "Deferring DNS" for each host and then the
usual "host name not found" messages.

The working command was:
$ cd /home/util64/ntp-4.2.6/bin
$ strace ./ntpd -n -c /etc/ntp.conf -g -u 123:130 2>&1 | tee /tmp/new.trace

-- 
Barry Fishman


** Attachment added: "NTP.trace"
   http://launchpadlibrarian.net/42195540/NTP.trace

-- 
ntp host name not found error
https://bugs.launchpad.net/bugs/548885
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