I have set Chrony to sync with 4 NTP servers (config file below). When I run chronyc tracking
and chronyc sources
, it looks like the servers my machine is connecting to for NTP are not correct. I'd expect to see the list of servers I specify in the chronyd.conf file when I ask what server is being tracked and which sources it's using.
Tracking:
$ chronyc tracking
Reference ID : 216.152.240.220 (216.152.240.220)
Stratum : 3
Ref time (UTC) : Thu Feb 18 19:05:11 2016
System time : 0.000564536 seconds fast of NTP time
Last offset : +0.000280794 seconds
RMS offset : 0.000322653 seconds
Frequency : 19.616 ppm fast
Residual freq : +0.003 ppm
Skew : 0.053 ppm
Root delay : 0.039604 seconds
Root dispersion : 0.000406 seconds
Update interval : 1042.6 seconds
Leap status : Normal
Sources:
$ chronyc sources
210 Number of sources = 4
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^+ ntp.newfxlabs.com 2 10 377 754 -415us[ -143us] +/- 31ms
^* 216.152.240.220 2 10 377 221 +1823us[+2104us] +/- 21ms
^- nox.prolixium.com 2 10 273 22 +4137us[+4137us] +/- 93ms
^- triangle.kansas.net 2 10 376 34m -2860us[-2291us] +/- 103ms
Config file (all defaults except for the server portion at the top):
$ cat /etc/chrony.conf
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#server 0.rhel.pool.ntp.org iburst
##server 1.rhel.pool.ntp.org iburst
##server 2.rhel.pool.ntp.org iburst
##server 3.rhel.pool.ntp.org iburst
server 0.us.pool.ntp.org
server 1.us.pool.ntp.org
server 2.us.pool.ntp.org
server 3.us.pool.ntp.org
# Ignore stratum in source selection.
stratumweight 0
# Record the rate at which the system clock gains/losses time.
driftfile /var/lib/chrony/drift
# Enable kernel RTC synchronization.
rtcsync
# In first three updates step the system clock instead of slew
# if the adjustment is larger than 10 seconds.
makestep 10 3
# Allow NTP client access from local network.
#allow 192.168/16
# Listen for commands only on localhost.
bindcmdaddress 127.0.0.1
bindcmdaddress ::1
# Serve time even if not synchronized to any NTP server.
#local stratum 10
keyfile /etc/chrony.keys
# Specify the key used as password for chronyc.
commandkey 1
# Generate command key if missing.
generatecommandkey
# Disable logging of client accesses.
noclientlog
# Send a message to syslog if a clock adjustment is larger than 0.5 seconds.
logchange 0.5
logdir /var/log/chrony
#log measurements statistics tracking
timedatectl:
$ timedatectl
Local time: Thu 2016-02-18 14:13:33 EST
Universal time: Thu 2016-02-18 19:13:33 UTC
RTC time: Thu 2016-02-18 19:13:33
Time zone: America/New_York (EST, -0500)
NTP enabled: yes
NTP synchronized: yes
RTC in local TZ: no
DST active: no
Last DST change: DST ended at
Sun 2015-11-01 01:59:59 EDT
Sun 2015-11-01 01:00:00 EST
Next DST change: DST begins (the clock jumps one hour forward) at
Sun 2016-03-13 01:59:59 EST
Sun 2016-03-13 03:00:00 EDT
Best Answer
The servers you've specified:
are, as the names suggest, pools. When you look up one of these names, you may get any of hundreds of public NTP servers in the US, (and thousands worldwide if you chose some other countries) which are part of the pool. These are delivered via round-robin DNS.
When you view
chronyc sources
, you see the actual servers in the pool which were used.