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Questions tagged [ntp]

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

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28 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
44 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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2answers
132 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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123 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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46 views

Synchronize time on a regular basis

In contrast to How to force NTPD to update date/time after boot? I would like to have a time synchronisation from the internet once a day. Background: We have sometimes power loss in our region. ...
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1answer
51 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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24 views

Excessive consumption of 3G data

I am in charge of a project in which we have several raspberry distributed around my city, each one connected to a router (TP-LINK TL-MR3020) special to put them USB dongle of 3G connection. These ...
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58 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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383 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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119 views

Chrony - Revert to ntp pool when GPS signal lost

I have a Raspberry Pi 3B+ setup with a Uputronics GPS + PPS board. I'm using GPSD and Chrony to create the time server. If I start the Pi with no network and just the GPS antenna it performs as ...
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1answer
851 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
138 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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2answers
91 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
2k 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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2answers
65 views

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
36 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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1answer
89 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
8k 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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2answers
4k 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
135 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
109 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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0answers
854 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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2answers
1k 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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5answers
2k 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
275 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
1k 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
418 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 ...
2
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0answers
93 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 ...
3
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1answer
2k 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
7k 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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0answers
583 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
678 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 ...
2
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1answer
2k 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 ...
2
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1answer
3k 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
182 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 ...
6
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1answer
8k 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
43k views

Time and timezone issues on Pi

I've a raspberry Pi that I was using in EST timezone. It had ntp service installed (sudo apt-get install ntp) and the Pi was set to UTC timezone. The date on the Pi was correct, until I took the Pi to ...
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3answers
3k 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 ...
3
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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
672 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 ...
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0answers
375 views

NTP configuration is not working

I'm working with 10 raspberry and they are all connected to the same network via Wifi. I need to get the right time from the network, so I modified the ntp.conf file with the IP of my network (10.1.65....
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2answers
1k views

Sync Raspberry Pi with NTP Server on Boot

I am using my Raspberry Pi with OpenMediaVault, a variant of Debian/Raspian intended for running a NAS server. The web interface for the operating system features a user interface that allows for ...
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2answers
2k views

Raspberry pi time wrong

My raspberry Pi 2 has a wrong date and it is not a timezone problem since UTC time right now is (6:53 PM Thursday, June 2, 2016) and running: pi@raspberrypi2:~ $ date -u mié jun 1 14:13:45 UTC 2016 ...
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108 views

Wrong date after reboot … always the same… 2016-10-02 (future!)

Why my Raspberry after reboot sets date to 2016-10-02, every time? Date after reboot is exactly 2016-10-02 every time.... there is NTP deamon that changes it, but before it, it's always 2016-10-02...
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1answer
411 views

How can a raspberry pi get time from another pi

I'm trying to set a slave pi to let get time from master pi using ntp service. The master pi has been set to be a hotspot (which is not connected to the internet) and the slave pi connect to it via ...
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3answers
2k views

Raspberry Pi Time is off by 45 min

I'm currently running a Pi as a file and Webserver on my small home network. My two Windows-10 PCs have the correct time, but I noticed the Pi time is approx 45 minutes off. No big deal, but when I ...
3
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2answers
900 views

Make sntp run on boot in Jessie

I am building a raspbian-based distro (FullPageOS), and it seems like on boot of the latest Jessie sntp service is running, internet connection is established, but sntp is not updating the clock to ...
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1answer
1k views

Default NTP server on Arch Linux for rPI 2

I have a RPi 2 running Arch Linux (Linux 4.1.6-2-ARCH), I checked and it does not use ntpd but systemd-timesyncd. I quote from timesyncd wiki page To add time servers or change the provided ones, ...
3
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1answer
7k views

Time and date on clean install of raspbian is very wrong

The time and date of my pi with a clean install of raspbian running is very wrong. If I run date now, it tells me this: Thu May 7 01:39:43 2015. Neither the time or date is right. I've tried to ...