NTP synchronised problem in our Centos 7.6 node


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# 1  
NTP synchronised problem in our Centos 7.6 node

Someone, please help on this issue:-

Code:
Note : for security reason i didn't mention hostnames and ips.
==============================================================================

[root@ ~]# ntpstat
unsynchronised
   polling server every 1024 s
Ntpstat showing unsynchronised.

==============================================================================

[root@~]# systemctl status ntpd
‚óŹ ntpd.service - Network Time Service
   Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled; vendor preset: disabled)
   Active: active (running) since Thu 2019-04-04 15:00:51 UTC; 5 months 17 days ago
 Main PID: 8275 (ntpd)
    Tasks: 1
   Memory: 20.0K
==============================================================================

And all poller ntp servers are reaching through ntp port and no packet loss. 


[root@ ~]# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
   node1               2 u   64 1024    7    1.362   -4.212   3.041
    node2             2 u   65 1024    7    1.752   -4.089   3.023
   node3              2 u   64 1024    7   25.469   -4.160   2.876
    node4            2 u   63 1024    7   25.666   -4.238   2.930
    node5            2 u   66 1024    7   45.907   -5.017   3.054
  node6              2 u   65 1024    7   45.905   -4.499   3.045

==============================================================================
NTptime is giving return code 5;
[root@~]# ntptime
ntp_gettime() returns code 5 (ERROR)
  time e1305f50.e00d7fc8  Sat, Sep 21 2019  8:35:28.875, (.875206994),
  maximum error 16000000 us, estimated error 16000000 us, TAI offset 0
ntp_adjtime() returns code 5 (ERROR)
  modes 0x0 (),
  offset 0.000 us, frequency 43.490 ppm, interval 1 s,
  maximum error 16000000 us, estimated error 16000000 us,
  status 0x2041 (PLL,UNSYNC,NANO),
  time constant 10, precision 0.001 us, tolerance 500 ppm,
[root@~]# date
Sat Sep 21 08:35:33 UTC 2019

==============================================================================

This is the alert we're getting every time but usually, it's getting a fix within 10mins 

OP5 alert is :- 
'Check NTP Status' on host 'hostname' has passed the WARNING threshold.

Service: Check NTP Status
Service Notes: 

Status : WARNING
Notification Comment: 

Additional info:  
Warning - NTPd Health is 50% with 6 peer(s).

Thresholds:  Health (20%


Kindly help on this to fix the issue.

Last edited by Neo; 09-22-2019 at 07:14 AM.. Reason: Code Tags Please See YT Video on this: https://youtu.be/4BuPvWJV__k
# 2  
Hmm.

When I run ntpstat .... after a refresh install, I get the following:

Code:
ubuntu:~# ntpstat
synchronised to NTP server (198.50.238.156) at stratum 3 
   time correct to within 30 ms
   polling server every 64 s

Perhaps just install ntpd again from scratch with a fresh /etc/ntp.conf file (saving your current one before, of course)?

FYI:

Code:
ubuntu:~#  ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 0.ubuntu.pool.n .POOL.          16 p    -   64    0    0.000    0.000   0.000
 1.ubuntu.pool.n .POOL.          16 p    -   64    0    0.000    0.000   0.000
 2.ubuntu.pool.n .POOL.          16 p    -   64    0    0.000    0.000   0.000
 3.ubuntu.pool.n .POOL.          16 p    -   64    0    0.000    0.000   0.000
 ntp.ubuntu.com  .POOL.          16 p    -   64    0    0.000    0.000   0.000
+159.203.82.102  104.236.116.147  3 u   15   64  377   24.997    0.908   3.820
+63-225-179-23.t 204.123.2.5      2 u    8   64  377   60.418    0.388   3.881
#ntp.wdc1.us.lea 130.133.1.10     2 u    7   64  377   28.500    2.689   3.502
*november.system 139.78.97.128    2 u   12   64  377   32.184    0.602   3.532
#208.67.72.50    128.227.205.3    2 u    8   64  377   55.752   -3.484   3.526
+195.21.137.209  195.66.241.10    2 u    6   64  377   30.329    1.189   3.308
#ntpool1.603.new 204.9.54.119     2 u    6   64  377   13.701    2.929   3.439
+time.richiemcin 209.51.161.238   2 u    9   64  357   23.790    0.529   2.967
+darwin.kenyonra 127.67.113.92    2 u   14   64  357   41.307   -0.001   3.179
+static-72-87-88 128.59.0.245     2 u    4   64  377   31.062   -1.641   3.249
+y.ns.gin.ntt.ne 249.224.99.213   2 u   66   64  377    6.620    1.957   4.289
#alphyn.canonica 17.253.34.253    2 u   30   64  377   25.755   -1.800   3.689
+i.will.not.be.e 213.251.128.249  2 u    3   64  377   28.559   -2.690   3.311
+208.67.72.43    152.2.133.54     2 u    3   64  377   55.397   -1.380   3.396
+horp-bsd01.horp 152.2.133.54     2 u   14   64  377   28.801   -0.031   3.538
+lithium.constan 198.30.92.2      2 u   14   64  377   25.507   -2.083   3.563
+ns1.backplanedn 173.162.192.156  2 u   13   64  377   29.019    1.230   3.559
+time.nullrouten 216.218.254.202  2 u    8   64  377   49.467    3.116   3.677
+chilipepper.can 17.253.34.125    2 u   26   64  377   93.719    0.661   3.774
#neoknet.com     129.250.35.251   3 u    7   64  377   36.605    4.435  11.929

ubuntu:~# ntptime
ntp_gettime() returns code 0 (OK)
  time e1317a86.a7033a48  Sat, Sep 21 2019 23:43:50.652, (.652393818),
  maximum error 289516 us, estimated error 16 us, TAI offset 0
ntp_adjtime() returns code 0 (OK)
  modes 0x0 (),
  offset 0.000 us, frequency -15.952 ppm, interval 1 s,
  maximum error 289516 us, estimated error 16 us,
  status 0x2001 (PLL,NANO),
  time constant 3, precision 0.001 us, tolerance 500 ppm,

# 3  
OBTW, was able to reproduce, perhaps a similar error, by downloading the latest version of ntp manually and trying to install in a crude way:

Code:
ubuntu:/etc/init.d# ntptime
ntp_gettime() returns code 5 (ERROR)
  time e13182c8.b37ccc04  Sun, Sep 22 2019  0:19:04.701, (.701123517),
  maximum error 16000000 us, estimated error 16000000 us, TAI offset 37
ntp_adjtime() returns code 5 (ERROR)
  modes 0x0 (),
  offset 0.000 us, frequency 0.000 ppm, interval 1 s,
  maximum error 16000000 us, estimated error 16000000 us,
  status 0x2041 (PLL,UNSYNC,NANO),
  time constant 3, precision 1.000 us, tolerance 500 ppm,

This error happened when I tried to use the original directory, mixing the old install with the new install.

However, when restarted ntpd in a totally clean install directory, it worked fine.

Now running latest version:

Code:
ubuntu:/etc/init.d# ntpd --version
ntpd 4.2.8p13@1.3847 Sun Sep 22 05:03:19 UTC 2019 (1)

Reference: NTP Software Downloads
# 4  
This version we're using in our side.. Could please someone give solution for this issue
Code:
ntp-4.2.6p5-28.el7.centos.x86_64
ntpdate-4.2.6p5-28.el7.centos.x86_64

--- Post updated at 09:40 AM ---

Really thanks for your reply.. We're running ntp around 50 nodes.. it's difficult to reinstall in all. Can you tell why it's happening.

This version we're using in our side.. Could please someone give solution for this issue
Code:
ntp-4.2.6p5-28.el7.centos.x86_64
ntpdate-4.2.6p5-28.el7.centos.x86_64

# 5  
Your version of NTP was released in 2011, nearly a decade (8 years) ago:

Code:
[   ]	ntp-4.2.6p5-RC1.tar.gz	2011-10-18 19:33	4.0M	 
[   ]	ntp-4.2.6p5-RC1.tar.gz.md5	2011-10-18 19:33	57	 
[   ]	ntp-4.2.6p5-RC2.tar.gz	2011-11-30 22:19	4.0M	 
[   ]	ntp-4.2.6p5-RC2.tar.gz.md5	2011-11-30 22:19	57	 
[   ]	ntp-4.2.6p5-RC3.tar.gz	2011-12-08 21:22	4.0M	 
[   ]	ntp-4.2.6p5-RC3.tar.gz.md5	2011-12-08 21:22	57	 
[   ]	ntp-4.2.6p5.tar.gz	2011-12-24 18:52	4.0M	 
[   ]	ntp-4.2.6p5.tar.gz.md5	2011-12-24 18:52	53

For security and other reasons, you must upgrade to the latest version.

Your version of ntp is NOT SUPPORTED by anyone.

It is your responsibility to upgrade, not complain how many servers you have running with obsolete code (sorry to tell you directly, but it is true).

Reference: Index of /~ntp/ntp_spool/ntp4/ntp-4.2

You might want to check out this page of ntp vulnerabilities:

NTP : Products and vulnerabilities
# 6  
Thank you!!. sure. Let me upgrade and let you know. Hope this is the latest version : -ntpd 4.2.8p13@1.3847
# 7  
Quote:
Originally Posted by shanmugaraj
Thank you!!. sure. Let me upgrade and let you know. Hope this is the latest version : -ntpd 4.2.8p13@1.3847
Yes.
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NTP was created to synchronize all participating computers to within a few milliseconds of Coordinated Universal Time (UTC).
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