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Ubuntu 24.04 Time Client Setup

These instructions setup Ubuntu 24.04 as a PTP client.

  1. Turn off NTP
  2. PTP Client without Services
  3. PTP Client with Services
  4. Logging
  5. Useful Links

Turn off NTP

The PPS signal at the server is not necessarily synchronized to a time standard. Therefore, the client should turn off NTP services as these may contradict the PTP master.

sudo timedatectl set-ntp no

Verify NTP services are inactive:

timedatectl

PTP Client without Services

Install the necessary packages:

sudo apt install linuxptp

Then run:

sudo ptp4l -f ptp4l_client.conf -i enp4s0 -m
sudo phc2sys -w -s enp4s0 -n 55 -m

The option -n 55 is the domain and must match the server's domain.

PTP Client with Services

Edit /etc/linuxptp/ptp4l.conf and change the following values:

slaveOnly               1
domainNumber            55

The value domainNumber must match the server's domain.

Start the service:

sudo systemctl enable ptp4l@enp4s0
sudo systemctl start ptp4l@enp4s0

To synchronize the system clock with the PHC, phc2sys is used. Edit /lib/systemd/system/phc2sys@.service lines to match:

Requires=ptp4l@enp4s0.service
After=ptp4l@enp4s0.service

ExecStart=/usr/sbin/phc2sys -w -s %I -n 55

Start the service:

sudo systemctl enable phc2sys@enp4s0
sudo systemctl start phc2sys@enp4s0

Logging

journalctl -f -u ptp4l@enp4s0
journalctl -f -u phc2sys@enp4s0