[Planetlab-users] NTP daemon

[Neil Spring]

Markus,

NTP is already running on planetlab... believe it or not.

You may be able to run some of the ntp tools (e.g., ntptrace) on  
planetlab to figure out what the running daemon thinks.

(Even if ntp weren't already running, you would need permission to  
bind the privileged port 123.  I don't *think* there's a way to run an  
NTP server on a different port, but you might look into it.)

-neil

On Jan 29, 2008, at 5:30 PM, Markus Gnauck wrote:

> Hello PlanetLab Users!
>
> I installed ntp on some of my project's nodes. Unfortunately when  
> trying to run the ntp service it seems to crash immediately upon  
> startup.
>
> $ sudo yum install ntp
> ..works as expected..
>
> $ sudo /etc/init.d/ntpd start
> Starting ntpd:                                             [  OK  ]
>
> $ /etc/init.d/ntpd status
> ntpd dead but pid file exists
>
> I tried to search for the problem, with some sources suggesting to  
> delete /var/run/ntpd.pid and restarting ntpd. As anticipated that  
> did not help much. The results are still as depicted above. (To my  
> knowledge the configuration file ntpd.conf seems fine though.)
>
> When tracing the problem my tutor came up with the following output  
> which strongly seems like a permission issue:
>
> Jan 27 18:42:54 chronos ntpd[31596]: ntpd 4.2.0a at 1.1196-r Fri May 12
> 09:51:35 EDT 2006 (1)
> Jan 27 18:42:54 chronos ntpd[31596]: Cannot set RLIMIT_MEMLOCK:
> Operation not permitted
> Jan 27 18:42:54 chronos ntpd[31596]: mlockall(): Cannot allocate  
> memory
> Jan 27 18:42:54 chronos ntpd[31596]: precision = 1.000 usec
> Jan 27 18:42:54 chronos ntpd[31596]: bind() fd 4, family 2, port 123,
> addr 0.0.0.0, in_classd=0 flags=8 fails: Permission denied
> Jan 27 18:42:54 chronos ntpd[31596]: bind() fd 4, family 2, port 123,
> addr 127.0.0.1, in_classd=0 flags=0 fails: Permission denied
> Jan 27 18:42:54 chronos ntpd[31596]: bind() fd 4, family 2, port 123,
> addr 134.34.246.5, in_classd=0 flags=8 fails: Permission denied
> Jan 27 18:42:54 chronos ntpd[31596]: bind() fd 4, family 2, port 123,
> addr 134.34.246.5, in_classd=0 flags=8 fails: Permission denied
> Jan 27 18:42:54 chronos ntpd[31596]: bind() fd 4, family 2, port 123,
> addr 10.41.221.1, in_classd=0 flags=8 fails: Permission denied
> Jan 27 18:42:54 chronos ntpd[31596]: kernel time sync status 0040
> Jan 27 18:42:54 chronos ntpd[31596]: cap_set_proc() failed to drop  
> root
> privileges: Operation not permitted
>
> The problem appeared on all the nodes that I've considered. I'm kind  
> of at a loss right now. Do you have any suggestions, pointers or  
> help to solve my problem?!
> Please let me know if I better direct the question to a different  
> source of support for issues regarding PlanetLab.
>
> Thanks in advance! Cheers,
> -Markus
>
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