Re: [chrony-users] client not synchronizing

[Bill Unruh <unruh@xxxxxxxxxxxxxx>]

Why is the server offline to the client? Try getting rid of that "offline" in
the client chrony.conf


William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/

On Tue, 30 Apr 2019, Bernhard Bock wrote:

> Hi,
>
> I have a problem with a client not syncing to a server:
> Client is 172.17.200.46, server is 172.17.200.1
> The client shall only sync to this one, local server.
>
> Some info I gathered:
>
> Client is Ubuntu 18.04, chrony version 3.2 (+READLINE +IPV6 -DEBUG)
> Server is Ubuntu 16.04, chrony version 2.1.1 (+READLINE +ASYNCDNS +IPV6 +SECHASH)
>
>
> client$ chronyc sources
> 210 Number of sources = 1
> MS Name/IP address         Stratum Poll Reach LastRx Last sample
> ===============================================================================
> ^? 172.17.200.1                  3   6     0   762  +2508ns[-1228ns] +/-   22ms
>
> client$ chronyc activity
> 200 OK
> 0 sources online
> 1 sources offline
> 0 sources doing burst (return to online)
> 0 sources doing burst (return to offline)
> 0 sources with unknown address
>
> Client log:
>
> Apr 30 07:29:37 min systemd[1]: Starting chrony, an NTP client/server...
> Apr 30 07:29:37 min chronyd[2540413]: chronyd version 3.2 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SECHASH +SIGND +ASYNCDNS +IPV6 -DEBUG)
> Apr 30 07:29:37 min chronyd[2540413]: Frequency 14.588 +/- 5.355 ppm read from /var/lib/chrony/chrony.drift
> Apr 30 07:29:37 min systemd[1]: Started chrony, an NTP client/server.
> Apr 30 07:29:41 min chronyd[2540413]: Selected source 172.17.200.1
> Apr 30 07:29:43 min chronyd[2540413]: Can't synchronise: no selectable sources
>
>
> Last but not least, tcpdump on the client shows that communication is working:
>
> 07:29:37.411795 IP 172.17.200.46.ntp > 172.17.200.1.ntp: NTPv4, Client, length 48
> 07:29:37.412070 IP 172.17.200.1.ntp > 172.17.200.46.ntp: NTPv4, Server, length 48
> 07:29:39.453273 IP 172.17.200.46.ntp > 172.17.200.1.ntp: NTPv4, Client, length 48
> 07:29:39.453491 IP 172.17.200.1.ntp > 172.17.200.46.ntp: NTPv4, Server, length 48
> 07:29:41.487963 IP 172.17.200.46.ntp > 172.17.200.1.ntp: NTPv4, Client, length 48
> 07:29:41.488210 IP 172.17.200.1.ntp > 172.17.200.46.ntp: NTPv4, Server, length 48
> 07:29:43.514864 IP 172.17.200.46.ntp > 172.17.200.1.ntp: NTPv4, Client, length 48
> 07:29:43.515109 IP 172.17.200.1.ntp > 172.17.200.46.ntp: NTPv4, Server, length 48
>
> There’s no iptables on the client:
>
> # Generated by iptables-save v1.6.1 on Tue Apr 30 07:44:54 2019
> *filter
> :INPUT ACCEPT [158281735:197870343868]
> :FORWARD ACCEPT [0:0]
> :OUTPUT ACCEPT [156886496:170139641079]
> COMMIT
>
>
> Client config:
>
> pool 172.17.200.1 offline iburst trust

You tell the client not to bother the server. (offline)
Why do you have the offline there?

> keyfile /etc/chrony/chrony.keys
> driftfile /var/lib/chrony/chrony.drift
> log tracking measurements statistics
> logdir /var/log/chrony
> dumponexit
> dumpdir /var/lib/chrony
> logchange 0.5
> hwclockfile /etc/adjtime
> rtcsync
>
> Server config:
>
> pool 0.pool.ntp.org offline iburst
> pool 1.pool.ntp.org offline iburst
> pool 2.pool.ntp.org offline iburst

And why are they all offline?

> keyfile /etc/chrony/chrony.keys
> commandkey 1
> driftfile /var/lib/chrony/chrony.drift
> log tracking measurements statistics
> logdir /var/log/chrony
> maxupdateskew 100.0
> dumponexit
> dumpdir /var/lib/chrony
> logchange 0.5
> hwclockfile /etc/adjtime
> rtcsync
> local stratum 4
> allow 172.17
>
>
>
> My take is that the chrony client is rejecting the servers’ answers.
> The server seems to be fine, though:
>
> server$ chronyc activity
> 200 OK
> 12 sources online
> 0 sources offline
> 0 sources doing burst (return to online)
> 0 sources doing burst (return to offline)
> 0 sources with unknown address
>
> server$ chronyc tracking
> Reference ID    : 109.230.226.190 (ns2.tl-hosting.de)
> Stratum         : 3
> Ref time (UTC)  : Tue Apr 30 07:38:05 2019
> System time     : 0.000559654 seconds fast of NTP time
> Last offset     : +0.000469423 seconds
> RMS offset      : 0.000415522 seconds
> Frequency       : 18.103 ppm slow
> Residual freq   : +0.012 ppm
> Skew            : 0.058 ppm
> Root delay      : 0.019776 seconds
> Root dispersion : 0.010863 seconds
> Update interval : 1037.3 seconds
> Leap status     : Normal
>
>
> cheers,
> Bernhard
>
>
>
>
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