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OpenNTPD Input Plugin

Get standard NTP query metrics from OpenNTPD using the ntpctl command.

Below is the documentation of the various headers returned from the NTP query command when running ntpctl -s peers.

  • remote – The remote peer or server being synced to.
  • wt – the peer weight
  • tl – the peer trust level
  • st (stratum) – The remote peer or server Stratum
  • next – number of seconds until the next poll
  • poll – polling interval in seconds
  • delay – Round trip communication delay to the remote peer or server (milliseconds);
  • offset – Mean offset (phase) in the times reported between this local host and the remote peer or server (RMS, milliseconds);
  • jitter – Mean deviation (jitter) in the time reported for that remote peer or server (RMS of difference of multiple time samples, milliseconds);

Configuration

[[inputs.openntpd]]
  ## Run ntpctl binary with sudo.
  # use_sudo = false

  ## Location of the ntpctl binary.
  # binary = "/usr/sbin/ntpctl"

  ## Maximum time the ntpctl binary is allowed to run.
  # timeout = "5ms"

Metrics

  • ntpctl
    • tags:
      • remote
      • stratum
    • fields:
      • delay (float, milliseconds)
      • jitter (float, milliseconds)
      • offset (float, milliseconds)
      • poll (int, seconds)
      • next (int, seconds)
      • wt (int)
      • tl (int)

Permissions

It's important to note that this plugin references ntpctl, which may require additional permissions to execute successfully. Depending on the user/group permissions of the telegraf user executing this plugin, you may need to alter the group membership, set facls, or use sudo.

Group membership (Recommended):

$ groups telegraf
telegraf : telegraf

$ usermod -a -G ntpd telegraf

$ groups telegraf
telegraf : telegraf ntpd

Sudo privileges: If you use this method, you will need the following in your telegraf config:

[[inputs.openntpd]]
  use_sudo = true

You will also need to update your sudoers file:

$ visudo
# Add the following lines:
Cmnd_Alias NTPCTL = /usr/sbin/ntpctl
telegraf ALL=(ALL) NOPASSWD: NTPCTL
Defaults!NTPCTL !logfile, !syslog, !pam_session

Please use the solution you see as most appropriate.

Example Output

openntpd,remote=194.57.169.1,stratum=2,host=localhost tl=10i,poll=1007i,
offset=2.295,jitter=3.896,delay=53.766,next=266i,wt=1i 1514454299000000000