hikaru2001
Topic Author
Posts: 38
Joined: 18 Feb 2019, 04:13

NTP service between RevPi Cores

08 Aug 2022, 10:09

Hello friends,

I use RevPi Core A as NTP client to get the standard time from Internet while RevPi Core A s also set as NTP server to provide the time for my factory. (This is step is successful)
In my workshop 1 I want to use RevPi Core B as local time server and it synchronizes time with RevPi Core A. Is this practical? I can't succeed it.
Do you have some suggestion? Tks!
 
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nicolaiB
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Posts: 605
Joined: 21 Jun 2018, 10:33
Answers: 1
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Re: NTP service between RevPi Cores

08 Aug 2022, 12:25

Yes, this should work.

As I don't know what you have already tried (which not worked), please elaborate on what you already did on the RevPi in order to provide server functionaliy.

Nicolai
 
hikaru2001
Topic Author
Posts: 38
Joined: 18 Feb 2019, 04:13

Re: NTP service between RevPi Cores

08 Aug 2022, 15:09

Hi Nicolai,

In RevPi B I install ntpdate and ntp.
In the startup program I make the following code:

#! /bin/sh
Sleep 40s
Killall ntpd
ntpdate -u 202.199.131.1
ntpd -c /etc/ntp.conf

202.199.131.1 is my time server of factory(RevPi A). RevPi B can get time from it however it can’t provide time to others.
After ntpq -p in RevPi B, only display
0.debian.pool.n
1.debian.pool.n
2.debian.pool.n
3.debian.pool.n
////////////////////
It looks like something wrong.
 
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nicolaiB
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Joined: 21 Jun 2018, 10:33
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Re: NTP service between RevPi Cores

08 Aug 2022, 15:43

I can't see where you configured the ntp server on your client? (usually /etc/ntp.conf)?
 
hikaru2001
Topic Author
Posts: 38
Joined: 18 Feb 2019, 04:13

Re: NTP service between RevPi Cores

09 Aug 2022, 05:44

Hi Nicolai,

Below is the code of ntp.conf in my RevPi A (NTP server)
_________________________________________________________________________________________________________________
GNU nano 2.7.4 File: /etc/ntp.conf Modified

#pool 2.debian.pool.ntp.org iburst
#pool 3.debian.pool.ntp.org iburst
###############################################################################
pool 115.238.151.242 #Time server IP address
fudge 115.238.151.242 stratum 10
pool 127.127.1.0 #Use own time when diconnection with timer server
fudge 127.127.1.0 stratum 8
##############################################################################

# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details. The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>
# might also be helpful.
#
# Note that "restrict" applies to both servers and clients, so a configuration
# that might be intended to block requests from certain clients could also end
# up blocking replies from your own upstream servers.

# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery limited
restrict -6 default kod notrap nomodify nopeer noquery limited
# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help

driftfile /var/lib/ntp/ntp.drift

# Enable this if you want statistics to be logged.
#statsdir /var/log/ntpstats/

statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable


# You do need to talk to an NTP server or two (or three).
#server ntp.your-provider.example

# pool.ntp.org maps to about 1000 low-stratum NTP servers. Your server will
# pick a different set every time it starts up. Please consider joining the
# pool: <http://www.pool.ntp.org/join.html>
#pool 0.debian.pool.ntp.org iburst
#pool 1.debian.pool.ntp.org iburst
#pool 2.debian.pool.ntp.org iburst
#pool 3.debian.pool.ntp.org iburst
###############################################################################
pool 115.238.151.242 #Time server IP address
fudge 115.238.151.242 stratum 10
pool 127.127.1.0 #Use own time when diconnection with timer server
fudge 127.127.1.0 stratum 8
##############################################################################

# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details. The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>
# might also be helpful.
#
# Note that "restrict" applies to both servers and clients, so a configuration
# that might be intended to block requests from certain clients could also end
# up blocking replies from your own upstream servers.

# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery limited
restrict -6 default kod notrap nomodify nopeer noquery limited
# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1

# Needed for adding pool entries
restrict source notrap nomodify noquery

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
#restrict 192.168.20.0 mask 255.255.255.0


# If you want to provide time to your local subnet, change the next line.
# (Again, the address is an example only.)
##################################################
broadcast 192.168.20.255 #time client range
##################################################
#broadcast 224.0.1.1

# If you want to listen to time broadcasts on your local subnet, de-comment the
# next lines. Please do this only if you trust everybody on the network!
#disable auth
#broadcastclient
______________________________________________________________________________________________________________________

When I enter "nptdate RevPi A address", the window of "no server suitable for synchronization found" come up.
Pls give me some suggestion. Tks tons!

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