Using the docker-compose.yml file included in this git repo, you can build the container yourself (should you choose to).
*Note: this docker-compose files uses the 3.4 compose format, which requires Docker Engine release 17.09.0+
# clone, run
$ git clone https://github.com/rickrussell/ntp
$ cd ntp
$ docker-compose up -d
From any machine that has ntpdate you can query your new NTP container with the follow
command:
$> ntpdate -q <DOCKER_HOST_IP>
Here is a sample output from my environment:
$> ntpdate -q <IP of Docker Host>
server <IP of Docker Host>, stratum 1, offset 0.010089, delay 0.02585
17 Sep 15:20:52 ntpdate[14186]: adjust time server <IP of Docker Host> offset 0.010089 sec
If you see a message, like the following, it's likely the clock is not yet synchronized, or, perhaps you don't have the ntp ports forwarded
$> ntpdate -q <IP of Docker Host>
server <IP of Docker Host>, stratum 1, offset 0.005689, delay 0.02837
11 Dec 09:47:53 ntpdate[26030]: no server suitable for synchronization found
To see details on the chronyd(ntp) status, you can check with the below command on your docker host:
$> cd ntp
projects/IaC/ntp $> docker-compose ps
projects/IaC/ntp $> docker-compose ps
Name Command State Ports
--------------------------------------------------------------------------------------------
ntp webproc --on-exit restart ... Up 0.0.0.0:123->123/udp, 0.0.0.0:8080->8080/tcp
$> docker-compose exec ntp chronyc tracking
Reference ID : 7F7F0101 ()
Stratum : 1
Ref time (UTC) : Mon Jul 22 18:14:32 2019
System time : 0.000000000 seconds fast of NTP time
Last offset : +0.000000000 seconds
RMS offset : 0.000000000 seconds
Frequency : 0.000 ppm slow
Residual freq : +0.000 ppm
Skew : 0.000 ppm
Root delay : 0.000000000 seconds
Root dispersion : 0.000000000 seconds
Update interval : 0.0 seconds
Leap status : Normal
$> docker-compose exec ntp chronyc sourcestats
210 Number of sources = 6
Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
==============================================================================
time-b-g.nist.gov 0 0 0 +0.000 2000.000 +0ns 4000ms
time-b-wwv.nist.gov 0 0 0 +0.000 2000.000 +0ns 4000ms
triton.ellipse.net 0 0 0 +0.000 2000.000 +0ns 4000ms
server.nanoslim.org 0 0 0 +0.000 2000.000 +0ns 4000ms
cartwheel.spiderspace.co> 0 0 0 +0.000 2000.000 +0ns 4000ms
nu.binary.net 0 0 0 +0.000 2000.000 +0ns 4000ms
$> docker-compose exec ntp chronyc sources
210 Number of sources = 6
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^? time-b-g.nist.gov 0 10 0 - +0ns[ +0ns] +/- 0ns
^? time-b-wwv.nist.gov 0 10 0 - +0ns[ +0ns] +/- 0ns
^? triton.ellipse.net 0 10 0 - +0ns[ +0ns] +/- 0ns
^? server.nanoslim.org 0 10 0 - +0ns[ +0ns] +/- 0ns
^? cartwheel.spiderspace.co> 0 10 0 - +0ns[ +0ns] +/- 0ns
^? nu.binary.net 0 10 0 - +0ns[ +0ns] +/- 0ns
$> docker-compose exec ntp chronyc makestep
200 OK
Links: chronyc (chrony cli) chronyd (chrony daemon) chrony.conf