Node_exporter: couldn't get SNTP reply: ....connection refused"

[shamimgeek]

Error message

Apr 18 21:41:04 shamim-slave-1 node_exporter: time="2018-04-18T21:41:04Z" level=error msg="ERROR: ntp collector failed after 0.000725s: couldn't get SNTP reply: read udp 127.0.0.1:39205->127.0.0.1:123: read: connection refused" source="collector.go:123"

Host operating system: output of uname -a

Linux shamim-slave-1.novalocal 3.10.0-693.el7.x86_64 #1 SMP Tue Aug 22 21:09:27 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

node_exporter version: output of node_exporter --version

[root@shamim-slave-1 ~]# node_exporter --version
node_exporter, version 0.15.2 (branch: , revision: )
  build user:       copr
  build date:       20180108-08:17:01
  go version:       go1.8.3
[root@shamim-slave-1 ~]# 

node_exporter command line flags

--collector.ntp --collector.ksmd --collector.logind --collector.systemd --collector.tcpstat --collector.interrupts

some more info

[root@shamim-slave-1 ~]# chronyc tracking
Reference ID    : 0AAB0805 (10.171.8.5)
Stratum         : 3
Ref time (UTC)  : Wed Apr 18 21:38:14 2018
System time     : 0.000005946 seconds fast of NTP time
Last offset     : +0.000008580 seconds
RMS offset      : 0.000057627 seconds
Frequency       : 60.840 ppm slow
Residual freq   : +0.000 ppm
Skew            : 0.016 ppm
Root delay      : 0.001514490 seconds
Root dispersion : 0.016857117 seconds
Update interval : 1043.4 seconds
Leap status     : Normal
[root@shamim-slave-1 ~]# 

[root@shamim-slave-1 ~]# chronyc sources
210 Number of sources = 2
MS Name/IP address         Stratum Poll Reach LastRx Last sample               
===============================================================================
^- 10.171.8.4                    2  10   363   693    -13us[-5034ns] +/-   75ms
^* 10.171.8.5                    2  10   377   564    +16us[  +25us] +/-   50ms
[root@shamim-slave-1 ~]# 


[root@shamim-slave-1 ~]# chronyc sourcestats
210 Number of sources = 2
Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev
==============================================================================
10.171.8.4                 64  34   18h     +0.026      0.029   +470us  1342us
10.171.8.5                 12   5  207m     +0.000      0.015   +108ns    47us
[root@shamim-slave-1 ~]# 


[root@shamim-slave-1 ~]# netstat -lntp |grep node_exporter
tcp6       0      0 :::9100                 :::*                    LISTEN      22447/node_exporter 
[root@shamim-slave-1 ~]# 

[SuperQ]

chronyc uses a proprietary protocol to talk to the chronyd. The node_exporter only knows how to talk NTP protocol, so you have to make sure that you allow it access. By default, this is disabled.

Make sure you add an allow line in your chrony.conf.

allow 127/8

[shamimgeek]

@SuperQ : After allowing 127/8 in chrony.conf. Error is gone.
Thanks

[SuperQ]

👍 Also, ❤️ chrony.