This repo contains the masterclock GPS driver with some modifications
- It has been dockerized so you can launch it on your bare-metal k8s cluster (or similar)
- It has been patched so that the gpsmcr util no longer modifies the time itself (the adjustment was not monotonic), but delegates the work to chrony
Simply docker-compose up -d
$ docker exec -ti gpsmcr ./gmtool
GMTOOL for PCIe-GPS/PCIe-TCR/PCIe-OCS (version 0.3.0)
Card firmware: 1.0.3
Daemon version: 0.4.0 Start time (UTC): 11:06:28 09/30/2019
RTC: Locked GPS: Locked TC: Unlocked HSO: Unknown HSO_A: 0
Reference time: 09:44:28.883 03/03/2020
System time: 09:44:28.883 03/03/2020
Synchronization mode: Waiting for Lock
Time delta: +0 sec, 49.095 us
Latitude 46XXXXXXXX,N Longitude 006XXXXXXXX,E Altitude 00521 Fix quality=1
Satellites=8
$ docker exec -ti chrony chronyc sources -v
210 Number of sources = 6
.-- Source mode '^' = server, '=' = peer, '#' = local clock.
/ .- Source state '*' = current synced, '+' = combined , '-' = not combined,
| / '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
|| .- xxxx [ yyyy ] +/- zzzz
|| Reachability register (octal) -. | xxxx = adjusted offset,
|| Log2(Polling interval) --. | | yyyy = measured offset,
|| \ | | zzzz = estimated error.
|| | | \
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
#* GPS 0 4 377 19 +13us[ +14us] +/- 13us
^? aton.infomaniak.ch 3 10 377 130d -5152ms[ -251us] +/- 67ms
^- falseticker.ntp.infomani> 2 9 377 87m -587us[ +106us] +/- 32ms
^- tick.ntp.infomaniak.ch 1 8 17 353 +3401ns[ +790ns] +/- 394us
^- tick.ntp.infomaniak.ch 1 6 377 125 -2198ns[-2343ns] +/- 60us
^- metasntp13.admin.ch 1 10 377 225 -242us[ -246us] +/- 4572us
If you see the #* GPS line, then everything is well