Use Revpi as NTP Server

Description:

I want to 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.

1. Install NTP server

"sudo apt-get install ntp"

1. Configure NTP server

"sudo nano /etc/ntp.conf"
Important part need to be modified in the file.
"
pool http://0.debian.pool.ntp.org iburst #Standard time server from Internet
pool 1.debian.pool.ntp.org iburst
pool 2.debian.pool.ntp.org iburst
pool 3.debian.pool.ntp.org iburst

# 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 #allowed local time client range, here is 192.168.20.1~192.168.20.254
##################################################
"

1. restart NTP server

"sudo service ntp restart"

1. Test

"ntpq -p"
If you have the similar feedback from the terminal, that means you are successful.
The IP address should be with *.

Wie stelle ich einen eigenen Zeitserver ein

1. sudo nano /etc/systemd/timesyncd.conf2

2. Zeile #NTP= in NTP=172.16.59.134 ändern

3. sudo systemctl restart systemd-timesyncd

Falls nach einer Weile die Zeit immer noch nicht synchronisiert wurde, kann das daran liegen, dass der Unterschied (clock skew) zu groß ist. Abhilfe kann wie folgt geschaffen werden:

1. NTP Synchronisation anhalten timedatectl set-ntp false

2. Zeit manuell setzen sudo timedatectl set-time "2021-10-18 09:19:00"

3. NTP Synchronisation wieder aufnehmen timedatectl set-ntp true