Questions tagged [ntp]

NTP, Network Time Protocol for time synchronization between computer systems over UDP.

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Raspberry pi cannot synchronize clock

I have bought three raspberry pi's with the intention of using them as temperature sensors throughout the building. I have bought the following models: 1 raspberry pi 4 model b 2gb 2 raspberry pi 4 ...
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1answer
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NTP not syncing

I need some help regarding the NTP daemon. I have problem to make ntpd sync with any external NTP servers. Raspberry IP is 192.168.10 (eth0). To simplify troubleshooting I am using the default ...
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force undisciplined ntp sync at boot

I have setup one ntp server pi and 5 client pi's. I want to force sync the clients to server clock on boot. With my current ntp settings the pi's are syncing but after a few minutes. I cannot wait so ...
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1answer
85 views

How to make sure RTC is accurate

I am using a RTC. I read the documentation for this module that it will lose a second every 24 hours. So, I assume i have to update it myself. After Googling I was drawn to this solution: hwclock --...
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68 views

Switch out the X1 Oscillator on a RPI

Just like a lot of people I'm using a RPi as a NTP server. There is a nice thread about it here: Switch out the X1 Oscillator on a RPI 2/3 User @colintd had a brilliant answer about switching the ...
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Ubuntu Mate 18.04 on Raspberry Pi 3 how to Synchronize Time Automatically every time i reboot

I had tried to set ntp and i think that is noused,because Timeout out of sync Is there any way to synchronize time?
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How to configure the Pi to automatically sync its time with the first android device that connects to it

I have a Raspberry Pi that has no access to internet. It is configured as an access point that I can connect to using my smartphone or tablet. Time on the Raspberry Pi is never correct after booting ...
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1answer
46 views

How to use ntp time as default time while using pi as a gateway?

I am using raspberry pi 4 as a gateway to my esp8266 devices. I have connected ethernet to pi for internet connection. It works fine. I want to generate ntp time in my esp8266 device. When I connect ...
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1answer
842 views

How to set NTP client on RPi-4 to point to a local IP on my lan?

I'm putzing with RPi-4 with (I guess) stretch and initially both the NTP= and Fallbackntp= lines of timesyncd.conf are hashed out. Yet service ntp status shows it soliciting 10 pool servers. When I ...
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DNS and NTP not working after installing NetworkManger on Raspberry Pi

can anyone help me, this issue has been driving me mad for 4 months, I have very limited experience with any form or Linux and at a complete loss at to how to make it work. I have a Raspberry Pi 4 ...
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2answers
1k views

GPS (USB) with NTP has a consistantly large offset and high jitter from public NTP sources

I have a Raspberry Pi Model B Rev 2 (BCM2835 rev 000e). Connected to it is a USB G-Mouse GPS receiver - which is really just a u-blox 7 GPS receiver. I've had it running for about 15 hours now and it ...
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3answers
777 views

How to know if time is synced?

I'm writing a software in C and it is running as a systemd service. I need the service to run after time has synced or alternatively, I need a way for my C program to identify if time has synced. I'm ...
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48 views

Raspberry Pi Date and Time wrong with using both Ethernet and WiFi

Update I resolved the issue. My static ip address had a default gateway set. Once removed the issue was fixed. I have a Raspberry Pi that I use in headless mode, and it has been configured to ...
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1answer
1k views

Configure Date and Time from On Boarding Script

I work at a manufacturing plant and we use raspberry pis for videos on a schedule. We use Screenly to schedule when certain videos will play back but currently I also need to manually correct the date ...
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631 views

What is the most apt way to setup a RTC?

I've gone through a plethora of sources and found it a little confusing with too much information hence posting this question. Firstly, the scenario is, I've set up my PI-3B(jessie) with PCF8523t RTC....
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1answer
337 views

Raspberry Pi 3 B+ not reading time from the GPS

I have a Raspberry Pi 3 B+ with Adafruit Ultimate GPS HAT (https://www.adafruit.com/product/2324) with external antenna. I configured the device to act as NTP server but the NTP server won't work (No ...
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1answer
116 views

Raspberry PI 3 B+ as NTP server cannot sync

I have setup my RPI 3 B+ model to act as an NTP server but I'm not able to sync my window machine to it. The NTP server uses PPS from GPS devices (Adafruit ultimate GPS hat) attached to external ...
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377 views

cannot sync timedatectl (pi to PC)

when I type timedatectl I can see that sync is active. however the pi fails to get the time from a PC connected to it (on this pc the service W32time is running and should provide time info to all ...
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968 views

Raspberry pi ntp client fails to sync on network master clock

I have a pi3B+ with stretch. I am trying to sync its clock using a network master clock (a pc set as ntp server) through direct ethernet connection. I can't see my server synching the pi. I followed ...
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1answer
4k views

Raspberry Pi as LAN Time Server?

I found variations to my question but I'm not sure those other topics answer my question specifically. I have several smart switches on which I have flashed custom firmware. One of the primary ...
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1answer
239 views

ntp doesn't work in raspberry pi

the problem is my raspberry pi 3 doesn't show the correct date and time.i edit this file: sudo nano /etc/ntp.conf with correct server addresses and i try this commands : sudo /etc/init.d/ntp stop ...
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203 views

pi zero running raspbian has UTC time 4 hours off

Ok, I have this raspberry pi zero that's been running for most of a year now and I noticed a few weeks ago that the time was off by several hours. I did some digging and it just plain thinks that UTC ...
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2answers
4k views

NTP is not enabled (doesn't exist) but Pi figures out timezone and time. How?

the ntp string isn't found in syslog. It's definitely not running. But when it has internet access, it has the right time. What's the mechanism? This is on Raspbian Stretch minimal install.
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Bash script doubt - How can I automatically update the hwclock with NTP when I have internet connection

Bash script in How can I automatically update the hwclock with NTP when I have internet connection seems not to run as expected in Raspbian Stretch 9.4 The log file will be created with the first ...
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1answer
63 views

Denver time zone shows EDT, -0400, should be MDT, -0600

Output from %timedatectl status is "Time zone: America/Denver (EDT, -0400)" Something is corrupt since Denver is in fact MDT, -0600. Is there a file I can remove and replace? Edit: As Jaromanda has ...
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329 views

Synchronise Pi clocks on a LAN with no Internet connection

I'm setting up an installation where a small number of LAN connected Pis (model 3) will display a number of image slideshows, each on a separate display. As the images on each of the displays must ...
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1answer
21k views

How to set custom NTP servers in recent raspbian (Stretch) systems?

How do I set the NTP server setting to a custom value in recent versions of Raspbian? I've noticed in a Stretch image that /etc/ntpd.conf does not exist in the default full image, nor is ntpd process ...
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3answers
5k views

Setup Raspberry Pi3 as NTP server (not using external NTP server)

I've searched around, but I cannot find an answer. Can I use my Raspberry Pi as an NTP server (independently). I want to synchronize 4 devices on a LAN for logging. They will be on a LAN with no ...
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1answer
203 views

Temperature variations affect NTP server accuracy

I have a ‘fun’ problem I’m trying to sort out. Bear with me! I’ve been running a Raspberry Pi 1 B+ for a year or so as an NTPsec Stratum one timeserver - using the GPS Hat (Here’s how you can make ...
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0answers
145 views

Verifying how recently Pi system time has been synched to ntp servers within a script?

Questions are at the bottom. When adding a time stamp based on the Pi's system time to a data file, I'd like to include some information about how reliable that time is. For example, if the Pi has ...
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1answer
2k views

Recommended way for a python script to check NTP update status, and initiate an update if necessary?

I am writing a data logging python script and I would like it to find out if the system clock has been synchronized via NTP recently, and if not, to attempt to cause it to happen before proceeding. ...
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2k views

setting local ntp server does not work

I want to sync my RPI 3 to a local time server. I've installed ntp using apt-get. I edited the file /etc/ntp.conf and added the following line server [ip-address]. I restarted ntp using sudo ...
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3answers
3k views

Switch out the X1 Oscillator on a RPI 2/3

Just like a lot of people I'm using a RPi as a NTP server (more info about the basic setup here: https://framkant.org/2017/03/stratum-1-ntp-server-with-freebsd-on-raspberry-pi/) I have found that the ...
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1answer
449 views

System time problem on Raspberry Pi after power outage

If have a raspberry pi on Raspbian running a home automation server. That server depends upon accurate system time on the raspberry pi. When I have a power outage for a bit of time and then the ...
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1answer
2k views

Sync system clock with GPS time on `systemd-timesyncd`

With the arrival of Raspbian Stretch, ntpd is replaced by systemd-timesyncd. I used to be able to sync the system clock with GPS time by adding a few lines to /etc/ntp.conf. Anyone has any clue how to ...
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1answer
504 views

NTP—Master for WLAN without acces to the internet

I have successfully managed to setup an RPi3 as a WLAN router, such that other clients can connect to it. In case the master is connected via Ethernet and has Access to the internet, that connection ...
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0answers
153 views

How to manually adjust system clock for testing purposes

I have written a Python script that is set to run different functions at different days/times. I would like to test it by setting the system clock to 1-2 minutes before the dates/times that the Python ...
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1answer
4k views

Determining when NTP is active

I have a Python script that runs at startup and needs the correct time in order to function properly. I have setup the raspi-config to wait for a network connection before continuing so the code won'...
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2answers
11k views

How do I set Raspbian to use the primary time server time.nist.gov?

I have several Rpi3s running Raspbian. They collect data and I use FileZilla to copy data from one to another. Ideally, I am only copying files that have changes or are new. FileZilla can be ...
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621 views

Raspberry PI3 RTC problems with ntpd on jessie

i am looking for a solution that can prefer NTP, updating the RTC when possible, and then fall back to the RTC when no network is available. it seems that NTP do this job and when the ntp is running ...
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2answers
2k views

ntpd -gq hangs and time is not updated

In attempts to synchronize time, following the advice to run $ sudo ntpd -qg. This does not terminate on its own, and the time is not updated. How to debug this problem? pi@raspberrypi:~ $ sudo /etc/...
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1answer
1k views

ntp.conf Permission Denied on Pi3

I'm having an issue with my new Pi. I picked the starting project of Stratum 2 NTP server. At a minimum I would like to act as a local NTP server for machines on the LAN. Per multiple sources online ...
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2answers
3k views

Ntp service don't runs and timedate are wrong

My raspberry was wrong time and date. I run 'ps auxwww | grep ntp' and i get: pi 7282 0.0 0.1 4248 1480 pts/0 S+ 05:50 0:00 grep --color=auto ntp So i don't have ntp service ...
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1answer
4k views

DS3231 RTC not keeping time after shutdown on Raspberry Pi?

I'm assembling a Smart Mirror for an applied project for college. This mirror has a Raspberry Pi 3 on the back. How this all started is that the campus' network blocks NTP, so we had to buy an RTC ...
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1answer
211 views

NTP crashes Raspberry Pi

I have a Raspberry Pi 3. I use it as a FTP-server provisionally. Every 2/3 days it crashes because of a problem with the NTP. I have cut the power to reboot it. I have the system logs which show ...
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1answer
10k views

How to disable or shutdown NTP daemon?

I am running PI 3 as a standalone system. Therefore, it won't have internet connection and pi's date and time is manually set and Real Time Clock chip is used to keep the pi's date/time current. It ...
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3answers
71k views

Time and timezone issues on Raspberry Pi

I've a Raspberry Pi that I was using in the EST timezone. It had an NTP service installed (sudo apt-get install ntp) and the Raspberry Pi was set to the UTC timezone. The date on the Raspberry Pi was ...
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3answers
6k views

Chrony doesn't sync time with gpsd

I have a Raspberry Pi that will be used for logging sensor data while not connected to the internet. Since the Raspberry Pi doesn't have an RTC, and to still get the actual time, I want to use a GPS ...
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1answer
2k views

Raspberry Pi 2: Sync clock with local server?

I have 10 Rpi2s with me and I have created a setup like this. My Windows system clock is set to local time once and I expect it to be powered at all times. It is a Workstation class system and it acts ...
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1answer
935 views

Can I tell if NTP Synch has happened since boot?

I'm using a Raspberry Pi 2 (Jessie) to log some data. It only runs for a few hours at a time. When I boot it, the clock is wrong. This has been discussed at length in a number of threads. I'd like to ...