Setting the Beaglebone Black (BBB) Time Automatically using NTPSetting the Time on a Once- off Basis. On my current distribution the Beaglebone Black does not come with a working NTP installation in order to set the time. Because the board doesn’t have a battery backup, this means that we need a way to set the time when the board is running. If you wish to set the time you could do it on a once- off basis…When you boot the Beaglebone black, the time comes up as. Sat Jan 1 1. 2: 2.
GMT 2. 00. 0Which is quite some time ago! I noticed this because I did a git commit and in the github status it said that I did the update 1. To set the date once off you could use something like. Sat May 1. 8 2. 2: 5. BST 2. 01. 3root@beaglebone: ~# ntpdate - b - s - u pool. However, if you reboot your Beaglebone the time will be back to the good old year 2.
So, we need a way to update this each time the Beaglebone boots. Install the NTP Software. Next, we need to install the ntp software on the Beaglebone black – so, at the command prompt (I am using Angstrom here). Next, find a NTP server that is close to your location. We need to do this to be good ‘ntp citizens’ as it is not good to use a NTP root server as they are already heavily loaded … it is better to use a NTP pool server that is close to your location in order to help with load balancing.
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A Google search for my location “ntp server ireland” returns the website http: //www. For Ireland I get. So, I have edited my /etc/ntp. This is the most basic ntp configuration file.
The driftfile must remain in a place specific to this. NTP Servers for Ireland from www.
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Using local hardware clock as fallback. Disable this when using ntpd - q - g - x as ntpdate or it will sync to itself.
Defining a default security setting. This is the most basic ntp configuration file# The driftfile must remain in a place specific to this# machine - it records the machine specific clock error# NTP Servers for Ireland from www. Using local hardware clock as fallback# Disable this when using ntpd - q - g - x as ntpdate or it will sync to itself# fudge 1. Defining a default security settingrestrict.
The driftfile specifies the file that is used to store information about previous responses from the NTP servers you are using. This file contains internal information for NTP – leave it at /etc/ntp. If you only want to allow machines within your own network to synchronize their clocks with your server, but ensure they are not allowed to configure the server, set the restrict value as above. In my case, 1. 92. IP address of my network and 2. Important – make sure that you comment out the server and fudge lines or the server will sync to itself! Setting the logfile above is very useful as it allows you to check the /var/log/ntpd.
Set your localtime file according to your time zone. Next you need to set your /etc/localtime file according to your timezone.
If you go into the directory /usr/share/zoneinfo you will see a lot of different timezone files, e. Africa CET EST5. EDT GMT Greenwich MST7. MDT PST8. PDT UCT WET. America CST6. CDT Etc GMT+0 HST NZ Pacific UTC Zulu. Asia EET Europe GMT- 0 MET NZ- CHAT ROC Universal iso. Australia EST GB GMT0 MST PRC ROK W- SU zone.
Africa CET EST5. EDT GMT Greenwich MST7. MDT PST8. PDT UCT WETAmerica CST6.
CDT Etc GMT+0 HST NZ Pacific UTC Zulu. Asia EET Europe GMT- 0 MET NZ- CHAT ROC Universal iso. Australia EST GB GMT0 MST PRC ROK W- SU zone. You can copy the file directly or use one of the presets. In my case, Irish time is the same as London time. So. root@beaglebone: /usr/share/zoneinfo# cd Europe/. Europe# ls - al. drwxr- xr- x 2 root root 4.
Mar 1. 8 2. 01. 3 . Jan 1 1. 1: 4. 2 .. Mar 1. 9 2. 01. 3 London.
Mar 1. 9 2. 01. 3 Moscow. Mar 1. 9 2. 01. 3 Parisroot@beaglebone: /usr/share/zoneinfo# cd Europe/root@beaglebone: /usr/share/zoneinfo/Europe# ls - aldrwxr- xr- x. Mar. 18 2. 01. 3.
Jan 1. 11: 4. 2.- rw- r- -r- -1root root. Mar. 19 2. 01. 3London- rw- r- -r- -1root root.
Mar. 19 2. 01. 3Moscow- rw- r- -r- -1root root. Mar. 19 2. 01. 3Paris. So, I am going to use the London file – back to the /etc directory. Europe/London /etc/localtimeroot@beaglebone: /etc# rm localtimeroot@beaglebone: /etc# ln - s /usr/share/zoneinfo/Europe/London /etc/localtimeby setting a symbolic link from /etc/localtime to the timezone file. The advantage of this over copying the file is that you can see the timezone that was set when you ls. Jan 1 1. 2: 0. 5 localtime - > /usr/share/zoneinfo/Europe/London. Jan 1 1. 2: 0. 5 localtime - > /usr/share/zoneinfo/Europe/Londonroot@beaglebone: /etc# ls - al|grep localtimelrwxrwxrwx 1root root 3.
Jan 1. 12: 0. 5localtime- > /usr/share/zoneinfo/Europe/Londonroot@beaglebone: /etc# ls - al localtimelrwxrwxrwx 1root root 3. Jan 1. 12: 0. 5localtime- > /usr/share/zoneinfo/Europe/London. Okay, next we need to start the services. Follow the steps carefully…Enabling the NTP Services.
Setup the ntpd server by typing. This installs two services. Description=Network Time Service. After=network. target.
PIDFile=/run/ntpd. Exec. Start=/usr/bin/ntpd - p /run/ntpd.
Wanted. By=multi- user. Description=Network Time. Service. Exec. Start=/usr/bin/ntpd- p/run/ntpd. Wanted. By=multi- user.
Description=Network Time Service (one- shot ntpdate mode). Before=ntpd. service. Exec. Start=/usr/bin/ntpdate- sync silent. Remain. After. Exit=yes. Wanted. By=multi- user.
Description=Network Time Service(one- shot ntpdate mode)Exec. Start=/usr/bin/ntpdate- sync silent. Wanted. By=multi- user.
However, and importantly on the Beaglebone black you have to modify the second service to. Description=Network Time Service (one- shot ntpdate mode).
Before=ntpd. service. Exec. Start=/usr/bin/ntpd - q - g - x. Remain. After. Exit=yes. Wanted. By=multi- user. Description=Network Time. Service(one- shot ntpdate mode)Exec.
Start=/usr/bin/ntpd- q- g- x. Wanted. By=multi- user.
So, importantly you must replace the line “Exec. Start=/usr/bin/ntpdate- sync silent” with the line “Exec. Start=/usr/bin/ntpd - q - g - x”. The time will not automatically update unless you make this change. The reason for this is given in the ntpd man page (http: //linux. Most operating systems and hardware of today incorporate a time- of- year (TOY) chip to maintain the time during periods when the power is off. When the machine is booted, the chip is used to initialize the operating system time.
After the machine has synchronized to a NTP server, the operating system corrects the chip from time to time. In case there is no TOY chip or for some reason its time is more than 1. This causes ntpd to exit with a panic message to the system log. The - g option overrides this check and the clock will be set to the server time regardless of the chip time. However, and to protect against broken hardware, such as when the CMOS battery fails or the clock counter becomes defective, once the clock has been set, an error greater than 1. Finally, reboot and the date/time should be fine.
Note: If your ssh client ever hangs on a reboot type ~. When the system comes up.
Sat May 1. 8 2. 3: 2. BST 2. 01. 3root@beaglebone: /lib/systemd/system# date. And, this could be the case from now on. Enjoy, and remember to remain a good NTP citizen. Fixing the Hardware Clock.
Thanks to Louis Thiery in the comments below – he pointed out that the RTC Time was still out after you perform the steps above. I have made one additional change to the configuration and it seems to do the trick – It is probably a bit of a hack! Modify the ntpdate. Description=Network Time Service (one- shot ntpdate mode). Before=ntpd. service. Exec. Start=/usr/bin/ntpd - q - g - x.
Exec. Start=/sbin/hwclock - -systohc. Remain. After. Exit=yes.
Wanted. By=multi- user. Description=Network Time Service(one- shot ntpdate mode)Exec. Start=/usr/bin/ntpd- q- g- x. Exec. Start=/sbin/hwclock- -systohc. Wanted. By=multi- user. This appears to work as when you reboot and call timedatectl, you get the following output.
Local time: Sun 2. BST. Universal time: Sun 2. UTC. RTC time: Sun 2. Timezone: Europe/London (BST, +0. NTP enabled: no. NTP synchronized: yes. RTC in local TZ: no. DST active: yes. Last DST change: DST began at.
Sun 2. 01. 3- 0. 3- 3. GMT. Sun 2. 01. 3- 0. BST. Next DST change: DST ends (the clock jumps one hour backwards) at. Sun 2. 01. 3- 1. 0- 2.
BST. Sun 2. 01. 3- 1.
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