On Fri, 17 Mar 2017 12:20:15 -0600 Ian Lepore <i...@freebsd.org> wrote:
> On Fri, 2017-03-17 at 18:05 +0100, O. Hartmann wrote: > > Am Wed, 15 Mar 2017 13:12:37 -0700 > > Cy Schubert <cy.schub...@komquats.com> schrieb: > > > > > > > > Hi O.Hartmann, > > > > > > I'll try to answer as much as I can in the noon hour I have left. > > > > > > In message <20170315071724.78bb0...@freyja.zeit4.iv.bundesimmobilie > > > n.de>, > > > "O. H > > > artmann" writes: > > > > > > > > Running a host with several jails on recent CURRENT (12.0-CURRENT > > > > #8 r315187: > > > > Sun Mar 12 11:22:38 CET 2017 amd64) makes me trouble on a daily > > > > basis. > > > > > > > > The box is an older two-socket Fujitsu server equipted with two > > > > four-core > > > > Intel(R) Xeon(R) CPU L5420 @ 2.50GHz. > > > > > > > > The box has several jails, each jail does NOT run service ntpd. > > > > Each jail has > > > > its dedicated loopback, lo1 throughout lo5 (for the moment) with > > > > dedicated IP > > > > : > > > > 127.0.1.1 - 127.0.5.1 (if this matter, I believe not). > > > > > > > > The host itself has two main NICs, broadcom based. bcm0 is > > > > dedicated to the > > > > host, bcm1 is shared amongst the jails: each jail has an IP bound > > > > to bcm1 via > > > > whihc the jails communicate with the network. > > > > > > > > I try to capture log informations via syslog, but FreeBSD's ntpd > > > > seems to be > > > > very, very sparse with such informations, coverging to null - I > > > > can't see > > > > anything suiatble in the logs why NTPD dies almost every night > > > > leaving the > > > > system with a wild reset of time. Sometimes it is a gain of 6 > > > > hours, sometime > > > > s > > > > it is only half an hour. I leave the box at 16:00 local time > > > > usually and take > > > > care again at ~ 7 o'clock in the morning local time. > > > We will need to turn on debugging. Unfortunately debug code is not > > > compiled > > > into the binary. We have two options. You can either update > > > src/usr.sbin/ntp/config.h to enable DEBUG or build the port (it's > > > the exact > > > same ntp) with the DEBUG option -- this is probably simpler. Then > > > enable > > > debug with -d and -D. -D increases verbosity. I just committed a > > > debug > > > option to both ntp ports to assist here. > > > > > > Next question: Do you see any indication of a core dump? I'd be > > > interested > > > in looking at it if possible. > > > > > > > > > > > > > > > When the clock is floating that wild, in all cases ntpd isn't > > > > running any mor > > > > e. > > > > I try to restart with options -g and -G to adjust the time > > > > quickly at the > > > > beginning, which works fine. > > > This is disconcerting. If your clock is floating wildly without > > > ntpd > > > running there are other issues that might be at play here. At most > > > the > > > clock might drift a little, maybe a minute or two a day but not by > > > a lot. > > > Does the drift cause your clocks to run fast or slow? > > > > > > > > > > > > > > > Apart from possible misconfigurations of the jails (I'm quite new > > > > to jails an > > > > d > > > > their pitfalls), I was wondering what causes ntpd to die. i can't > > > > determine > > > > exactly the time of its death, so it might be related to > > > > diurnal/periodic > > > > processes (I use only the most vanilla configurations on > > > > periodic, except for > > > > checking ZFS's scrubbing enabled). > > > As I'm a little rushed for time, I didn't catch whether the jails > > > themselves were also running ntpd... just thought I'd ask. I don't > > > see how > > > zfs scrubbing or any other periodic scripts could cause this. > > > > > > > > > > > > > > > I'ven't had the chance to check whether the hardware is > > > > completely all right, > > > > but from a superficial point of view there is no issue with high > > > > gain of the > > > > internal clock or other hardware issues. > > > It's probably a good idea to check. I don't think that would cause > > > ntpd any > > > gas. I've seen RTC battery messages on my gear which haven't caused > > > ntpd > > > any problem. I have two machines which complain about RTC battery > > > being > > > dead, where in fact I have replaced the batteries and the messages > > > still > > > are displayed at boot. I'm not sure if it's possible for a kernel > > > to damage > > > the RTC. In my case that doesn't cause ntpd any problems. It's > > > probably > > > good to check anyway. > > > > > > > > > > > > > > > If there are known issues with jails (the problem occurs since I > > > > use those), > > > > advice is appreciated. > > > Not that I know of. > > > > > > > > Just some strange news: > > > > I left the server the whole day with ntpd disabled and I didn't watch > > a gain of the RTC > > by one second, even stressing the machine. > > > > But soon after restarting ntpd, I realised immediately a 30 minutes > > off! This morning, > > the discrapancy was almost 5 hours - it looked more like a weird > > ajustment to another > > time base than UTC. > > > > Over the weekend I'll leave the server with ntpd disabled and only > > RTC running. I've the > > strange feeling that something is intentionally readjusting the ntpd > > time due to a > > misconfiguration or a rogue ntp server in the X.CC.pool.ntp.org > > > > The rogue server theory is a bad one, unless you have configured just a > single server in your ntp.conf and it is the rogue. Ntpd requires > agreement among the set of configured servers, it will ignore outliers. Past weekend, I had switched off ntpd and ran the server completely with the onboard RTC. On Monday morning when I entered the office, the clock was in synchronisation with the official time. As usual, I update sources and buildworld. After a couple of builds over the week and letting ntpd restart via rc.conf as usual after rebooting, I checked over the past two days and i found the server always in a state of dissonant clock. The more curious part is that the clock is almost 6 hours behind UTC. I can not tell whether the ntpd is still trying to adjust time to a foreign clock which has another time reference. I checked the TZ and everything seems all right. > > It would help to have some actual data. What does ntpq -p show right > after starting ntpd? Then a few minutes later, then again 10 minutes [RESTART] remote refid st t when poll reach delay offset jitter ============================================================================== 0.de.pool.ntp.o .POOL. 16 p - 64 0 0.000 0.000 0.000 1.de.pool.ntp.o .POOL. 16 p - 64 0 0.000 0.000 0.000 2.de.pool.ntp.o .POOL. 16 p - 64 0 0.000 0.000 0.000 3.de.pool.ntp.o .POOL. 16 p - 64 0 0.000 0.000 0.000 ptbtime1.ptb.de .INIT. 16 u - 64 0 0.000 0.000 0.000 ptbtime2.ptb.de .INIT. 16 u - 64 0 0.000 0.000 0.000 [after 1 Minute] remote refid st t when poll reach delay offset jitter ============================================================================== 0.de.pool.ntp.o .POOL. 16 p - 64 0 0.000 0.000 0.000 1.de.pool.ntp.o .POOL. 16 p - 64 0 0.000 0.000 0.000 2.de.pool.ntp.o .POOL. 16 p - 64 0 0.000 0.000 0.000 3.de.pool.ntp.o .POOL. 16 p - 64 0 0.000 0.000 0.000 ptbtime1.ptb.de .PTB. 1 u 34 64 1 16.931 -4.841 0.000 ptbtime2.ptb.de .PTB. 1 u 34 64 1 18.273 -5.518 0.000 fks.dan.net.uk 188.8.131.52 3 u 31 64 1 24.217 -3.904 0.000 184.108.40.206 220.127.116.11 2 u 33 64 1 25.464 -2.449 0.000 ns3.customer-re 18.104.22.168 2 u 35 64 1 23.905 -1.187 0.000 ns1.blazing.de 22.214.171.124 2 u 36 64 1 17.045 -3.017 0.000 ntp2.m-online.n 126.96.36.199 2 u 36 64 1 20.758 -2.693 0.000 stratum2-3.NTP. 188.8.131.52 2 u 35 64 1 22.000 -3.800 0.000 estoma.de 184.108.40.206 3 u 33 64 1 7.919 -3.182 0.000 clint.blazing.d 220.127.116.11 2 u 34 64 1 17.642 -2.932 0.000 news01.nierle.c 18.104.22.168 2 u 34 64 1 19.880 -3.750 0.000 q.fu110.de 22.214.171.124 2 u 35 64 1 16.649 -6.037 0.000 [after ~10 Minutes] remote refid st t when poll reach delay offset jitter ============================================================================== 0.de.pool.ntp.o .POOL. 16 p - 64 0 0.000 0.000 0.000 1.de.pool.ntp.o .POOL. 16 p - 64 0 0.000 0.000 0.000 2.de.pool.ntp.o .POOL. 16 p - 64 0 0.000 0.000 0.000 3.de.pool.ntp.o .POOL. 16 p - 64 0 0.000 0.000 0.000 #ptbtime1.ptb.de .PTB. 1 u 45 64 177 15.740 0.289 1.147 #ptbtime2.ptb.de .PTB. 1 u 38 64 177 17.489 -0.651 1.632 #fks.dan.net.uk 126.96.36.199 3 u 46 64 177 21.736 -0.634 9.040 -188.8.131.52 184.108.40.206 2 u 41 64 177 23.400 1.216 1.353 +ns1.blazing.de 220.127.116.11 2 u 48 64 177 16.848 1.912 0.570 *ntp2.m-online.n 18.104.22.168 2 u 48 64 177 20.681 2.409 0.927 -stratum2-3.NTP. 22.214.171.124 2 u 44 64 177 20.868 1.482 0.719 +clint.blazing.d 126.96.36.199 2 u 42 64 177 16.612 2.374 12.795 -news01.nierle.c 188.8.131.52 2 u 40 64 177 20.127 1.504 12.851 #q.fu110.de 184.108.40.206 2 u 103 64 176 16.070 -0.769 0.663 > after that, etc. What is in the /var/db/ntpd.drift file? Are you > using the standard freebsd ntp.conf file as delivered, or have you > customized it? Any non-default settings in your rc.conf related to > ntp? The line in /etc/rc.conf is: ntpd_flags="-4 -g -G -I 192.168.0.1 -p /var/run/ntpd.pid -f /var/db/ntpd.drift" The IP at -I is the IP of the primary NIC of the machine, which has two NICs. I use a customized /etc/ntp.conf and I did a lot of variations during the approach to figure out the problem. I did the same on host onto the same network, but being of "modern date" (regarding hardware, the server in question is an 2008 two-socket Core2Duo XEON box with 2x 4 cores) and which does not host jails. The reference host seems not to show the weird clock gain. the recent /etc/ntp.conf looks this now: tos minclock 3 maxclock 6 server ptbtime1.ptb.de server ptbtime2.ptb.de pool 0.de.pool.ntp.org pool 1.de.pool.ntp.org pool 2.de.pool.ntp.org pool 3.de.pool.ntp.org restrict 192.168.0.0 mask 255.255.255.0 noquery kod nomodify notrap \ nopeer restrict default limited kod nomodify notrap noquery nopeer restrict -6 default limited kod nomodify notrap noquery nopeer restrict source limited kod nomodify notrap noquery restrict 127.0.0.1 restrict 127.127.1.0 restrict -6 ::1 leapfile "/var/db/ntpd.leap-seconds.list" > > -- Ian _______________________________________________ firstname.lastname@example.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"