chrony does not log anything on my ec2 instance

I just verified chrony logging by doing the following:

  1. created a default Ubuntu 18.04 LTS EC2 instance - AMI id: ubuntu/images/hvm-ssd/ubuntu-bionic-18.04-amd64-server-20180912 (ami-07a3bd4944eb120a0)
  2. installed chrony: sudo apt install chrony
  3. edited the default configuration in /etc/chrony/chronyd.conf to
    • add the AWS NTP source shown in your configuration above
    • uncomment the log tracking ... line
  4. restarted chrony: sudo service chrony restart
  5. confirmed that logging is working:
    [email protected]:~# ls -la /var/log/chrony/
    total 32
    drwxr-xr-x  2 _chrony _chrony  4096 Mar  7 22:20 .
    drwxrwxr-x 10 root    syslog   4096 Mar  7 22:19 ..
    -rw-r--r--  1 _chrony _chrony 10686 Mar  7 22:22 measurements.log
    -rw-r--r--  1 _chrony _chrony  4797 Mar  7 22:22 statistics.log
    -rw-r--r--  1 _chrony _chrony  1854 Mar  7 22:21 tracking.log
    
  6. Confirmed that chrony is contacting its sources:
    [email protected]:~# chronyc -n sources
    210 Number of sources = 9
    MS Name/IP address         Stratum Poll Reach LastRx Last sample               
    ===============================================================================
    ^* 169.254.169.123               3   6   377    48    +16us[  +46us] +/-  300us
    ^- 91.189.94.4                   2   7   241   103   +934us[ +957us] +/-  161ms
    ^- 91.189.91.157                 2   6    35    39  +2471us[+2471us] +/-  153ms
    ^- 91.189.89.199                 2   7    41   167  +1194us[+1203us] +/-  169ms
    ^? 2001:67c:1560:8003::c8        0   6     0     -     +0ns[   +0ns] +/-    0ns
    ^- 129.250.35.250                2   6   377    49   +914us[ +944us] +/-   93ms
    ^- 61.68.38.238                  3   6   377    49  -1395us[-1366us] +/-   59ms
    ^- 203.23.237.200                2   6   377    48  +2176us[+2176us] +/-   41ms
    ^- 150.101.217.196               2   6   377    48  -5039us[-5009us] +/-   76ms
    

So, my best guesses at the differences between your test and mine are:

  1. You've used a non-official Ubuntu 18.04 AMI

  2. You've used a non-official chrony package instead of just installing the one from the Ubuntu archives

  3. You've forgotten to restart chrony after changing the configuration