Re: Will ntpd tell me if it encounters problems?
- From: "Maarten Wiltink" <maarten@xxxxxxxxxxxxxxxxxx>
- Date: Wed, 11 Apr 2007 17:23:15 +0200
"gluino" <gluino@xxxxxxxxx> wrote in message
news:1176293456.182001.141420@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I am using the default ntpd setup in plain redhat box. Default============================================================================
settings except for specifying a nearer time server.
Everything seems fine (ntpq pasted below), and it has been left alone
for months.
Said box hardly receives human attention, and is depended on for time
sync by a couple hundred local machines.
My question is: how would I know if ntpd has problems. I'm thinking of
some kind of alert when ntpd is unable to contact any good time
servers, for example.
# ntpq -np
remote refid st t when poll reach delay
offset jitter
==
203.117.180.36 .INIT. 16 u - 1024 0 0.000 0.000
4000.00
+64.109.43.141 130.149.17.21 2 u 534 1024 377 313.466
-19.302 2.021
+64.246.40.39 67.15.110.21 3 u 505 1024 377 253.106
-13.209 0.184
127.127.1.0 LOCAL(0) 10 l 60 64 377 0.000
0.000 0.001
*203.117.180.36 .ACTS. 1 u 582 1024 337 31.425
4.047 1.380
Assume the above is healthy?
Well... marginal. Healthy now, but it wouldn't take much.
You have four servers but one has never been reachable at all and
two others are indeed very far away. Although the jitter isn't
bad, I wouldn't trust them too much if the fourth server went away.
Stability _would_ suffer.
Generating alerts could be done by some simple checking of ntpq -p
output from a cron job. Check that you have an asterisk and a few
pluses. Check the stratum, reach, delay, offset, and jitter in the
relevant lines. If you don't like what you see, send an email and
have a human look closer.
No matter with Richard and his exclamation marks say, I consider
the local clock justified. Having several hundred clients following
a single wandering server in the event of problems is probably
preferable to all of them wandering aimlessly. Stratum ten is fine.
Groetjes,
Maarten Wiltink
.
- References:
- Will ntpd tell me if it encounters problems?
- From: gluino
- Will ntpd tell me if it encounters problems?
- Prev by Date: Re: ntpd -gq VS ntpdate -B
- Next by Date: Re: ipv6 support on linux - bind problem
- Previous by thread: Re: Will ntpd tell me if it encounters problems?
- Next by thread: ntpd communicating with server, but reports ``no reply''.
- Index(es):
Relevant Pages
|
