[Cialug] NTPD -- OpenSUSE 10.1

[Josh More]

NTP will not serve unless the daemon knows that it's own time is
properly synchronized.
It can take up to half an hour for the daemon to gather enough data to
know this.

You can minimize the startup time by making the initial call use more
packets.  This is controlled with the "iburst" parameter.

Note that if you do this, there is a slight chance that that you will
sync to an out of sync server and be serving the wrong time to the rest
of your network.  Most people just wait the 30 mins and let it be.

 
 

-Josh More, RHCE, CISSP, NCLP 
 morej at alliancetechnologies.net 
 515-245-7701


>>> Matt Patterson <matt at usrlocal.com> 03/22/07 11:32 AM >>> 
Ok, this one is rather interesting.  So I installed the xntp package
which 
installs ntpd.  I editted the ntp.conf file in /etc/ to use one server
as 
a main ntp source that is across the network and setup a peer on the
local 
subnet.  So everything looks good in the config and I can start ntp and

get time for a bit.

After say 10 seconds or so, suddenly ntp decides it can no longer serve
up 
time.  It's running, just not sending out what I need.

Doing an strace I get the following.....

select(9, [4 5 6 7 8], NULL, NULL, {0, 0}) = 1 (in [8], left {0, 0})

recvfrom(8, 
"\343\0\4\372\0\1\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\311\255&\241WV\206\36",

1092, 0, {sa_family=AF_INET, sin_port=htons(23691), 
sin_addr=inet_addr("216.243.198.244")}, [16]) = 48

select(9, [8], NULL, NULL, {0, 0})      = 0 (Timeout)

  sendto(8, 
"$\0\4\354\0\0\0\0\0\0\0ZINIT\311\255&U\347\22\261\263\311\255&\241WV\206\36\311\255&\241WG\330\5\311\255&\241Wp\233s",

48, 0, {sa_family=AF_INET, sin_port=htons(23691), 
sin_addr=inet_addr("216.243.198.244")}, 16) = 48

select(9, [4 5 6 7 8], NULL, NULL, NULL) = ? ERESTARTNOHAND (To be 
restarted) ---  SIGALRM (Alarm clock) @ 0 (0) ---
rt_sigreturn(0xe)                       = - 1 EINTR (Interrupted system

call)



This continues for roughly 20 minutes and magically, ntp starts 
serving up time again.   Whiskey Tango Foxtrot!  Anyone have a clue on

why this is happening?

- Matt


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