The Network Time Protocol is used to synchronize the clocks of all computers in the CPM lab.
The Ubuntu ntp package should already be installed by the installation script.
Edit the NTP configuration sudo nano /etc/ntp.conf and insert your NTP server. In our case, this is:
pool ntp1.rwth-aachen.de iburst
pool ntp2.rwth-aachen.de iburst
Restart NTP using sudo service ntp restart.
Verify that NTP works correctly by running ntpq -p.
Under the st (stratum) column sould be at least one "1". This indicates a successful synchronization.
cpm@cpm-MS-7A94:~$ ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
ntp1.rwth-aache .POOL. 16 p - 64 0 0.000 0.000 0.000
ntp2.rwth-aache .POOL. 16 p - 64 0 0.000 0.000 0.000
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
*ts-1.rz.rwth-aa .GPS. 1 u 281 512 377 0.486 -1.204 0.122
+ntp2.rwth-aache .GPS. 1 u 187 512 377 0.563 -1.082 0.139
The website https://time.is/ is also useful for checking the clock synchronization.
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