systemd: require NTP sync Announcing the arrival of Valued Associate #679: Cesar Manara ...
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systemd: require NTP sync
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern)
2019 Community Moderator Election Results
Why I closed the “Why is Kali so hard” questionWhy do I get this at the end of a `last` command?Make systemd reload only single openvpn process and not the whole groupAdding a systemd .service (Debian)Why is systemd stopping service immediately after it is started?Systemd irregular timing issueInstruct to execute an unit after completing another unit successfullysystemd: finish the execution of custom shell script before starting nginxScript handling systemd service's return codeNTP time sync takes a long timeStopping systemd unit together with another. Starting worksSystemd Unit File - WantedBy and After
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}
What should I put in my unit file to ensure my service starts AFTER the time is set via ntp?
I have a raspberry pi with a small python script that logs data to a SQL data base. Since the rpi doesn't have an RTC battery, on startup or without an internet connection, the time and data are wrong. To avoid misleading timestamps in the database, the script should run after the correct time is acquired.
My unit file so far:
[Unit]
Description=desc
Requires=mysql.service
After=syslog.target mysql.service
[Service]
Type=simple
ExecStart= /usr/bin/python3 /etc/script/script.py
SyslogIdentifier=test
StandardOutput=null
StandardError=syslog
Restart=always
RestartSec=5
User=pi
[Install]
WantedBy=multi-user.target
How should I modify my unit file?
My systemd version is:
#> systemctl --version
systemd 232
systemd ntp
edited Apr 3 at 20:08
Jeff Schaller♦
45.1k1164147
asked Apr 3 at 10:21
Marvin NollMarvin Noll
262
|
show 5 more comments
What should I put in my unit file to ensure my service starts AFTER the time is set via ntp?
I have a raspberry pi with a small python script that logs data to a SQL data base. Since the rpi doesn't have an RTC battery, on startup or without an internet connection, the time and data are wrong. To avoid misleading timestamps in the database, the script should run after the correct time is acquired.
My unit file so far:
[Unit]
Description=desc
Requires=mysql.service
After=syslog.target mysql.service
[Service]
Type=simple
ExecStart= /usr/bin/python3 /etc/script/script.py
SyslogIdentifier=test
StandardOutput=null
StandardError=syslog
Restart=always
RestartSec=5
User=pi
[Install]
WantedBy=multi-user.target
How should I modify my unit file?
My systemd version is:
#> systemctl --version
systemd 232
systemd ntp
edited Apr 3 at 20:08
Jeff Schaller♦
45.1k1164147
asked Apr 3 at 10:21
Marvin NollMarvin Noll
262
1
No, i'm stuck with what i've got for now.
– Marvin Noll
Apr 3 at 12:29
1
a RTC battery is roughly 2 euros in aliexpress.
– Rui F Ribeiro
Apr 3 at 13:58
I don't have a raspberry pi distro to test against; my initiali instinct is to order mysql after ntp; is that sufficient?
– Jeff Schaller♦
Apr 3 at 20:11
@RuiFRibeiro is a Raspberry PI. It does not have a RTC clock at all. It's a module that is sold separately and need to be plugged in (Real Time Clock RTC DS3231 GPIO Module).
– user34720
Apr 3 at 20:13
1
@RuiFRibeiro thats cool. shame on my country that has lot of taxes so, importing hardware is a pain :P
– user34720
Apr 4 at 10:48
|
show 5 more comments
What should I put in my unit file to ensure my service starts AFTER the time is set via ntp?
I have a raspberry pi with a small python script that logs data to a SQL data base. Since the rpi doesn't have an RTC battery, on startup or without an internet connection, the time and data are wrong. To avoid misleading timestamps in the database, the script should run after the correct time is acquired.
My unit file so far:
[Unit]
Description=desc
Requires=mysql.service
After=syslog.target mysql.service
[Service]
Type=simple
ExecStart= /usr/bin/python3 /etc/script/script.py
SyslogIdentifier=test
StandardOutput=null
StandardError=syslog
Restart=always
RestartSec=5
User=pi
[Install]
WantedBy=multi-user.target
How should I modify my unit file?
My systemd version is:
#> systemctl --version
systemd 232
systemd ntp
edited Apr 3 at 20:08
Jeff Schaller♦
45.1k1164147
asked Apr 3 at 10:21
Marvin NollMarvin Noll
262
What should I put in my unit file to ensure my service starts AFTER the time is set via ntp?
I have a raspberry pi with a small python script that logs data to a SQL data base. Since the rpi doesn't have an RTC battery, on startup or without an internet connection, the time and data are wrong. To avoid misleading timestamps in the database, the script should run after the correct time is acquired.
My unit file so far:
[Unit]
Description=desc
Requires=mysql.service
After=syslog.target mysql.service
[Service]
Type=simple
ExecStart= /usr/bin/python3 /etc/script/script.py
SyslogIdentifier=test
StandardOutput=null
StandardError=syslog
Restart=always
RestartSec=5
User=pi
[Install]
WantedBy=multi-user.target
How should I modify my unit file?
My systemd version is:
#> systemctl --version
systemd 232
systemd ntp
systemd ntp
edited Apr 3 at 20:08
Jeff Schaller♦
45.1k1164147
asked Apr 3 at 10:21
Marvin NollMarvin Noll
262
edited Apr 3 at 20:08
Jeff Schaller♦
45.1k1164147
asked Apr 3 at 10:21
Marvin NollMarvin Noll
262
edited Apr 3 at 20:08
Jeff Schaller♦
45.1k1164147
edited Apr 3 at 20:08
Jeff Schaller♦
45.1k1164147
edited Apr 3 at 20:08
Jeff Schaller♦
45.1k1164147
45.1k1164147
asked Apr 3 at 10:21
Marvin NollMarvin Noll
262
asked Apr 3 at 10:21
Marvin NollMarvin Noll
262
asked Apr 3 at 10:21
Marvin NollMarvin Noll
262
262
1
No, i'm stuck with what i've got for now.
– Marvin Noll
Apr 3 at 12:29
1
a RTC battery is roughly 2 euros in aliexpress.
– Rui F Ribeiro
Apr 3 at 13:58
I don't have a raspberry pi distro to test against; my initiali instinct is to order mysql after ntp; is that sufficient?
– Jeff Schaller♦
Apr 3 at 20:11
@RuiFRibeiro is a Raspberry PI. It does not have a RTC clock at all. It's a module that is sold separately and need to be plugged in (Real Time Clock RTC DS3231 GPIO Module).
– user34720
Apr 3 at 20:13
1
@RuiFRibeiro thats cool. shame on my country that has lot of taxes so, importing hardware is a pain :P
– user34720
Apr 4 at 10:48
|
show 5 more comments
1
No, i'm stuck with what i've got for now.
– Marvin Noll
Apr 3 at 12:29
1
a RTC battery is roughly 2 euros in aliexpress.
– Rui F Ribeiro
Apr 3 at 13:58
I don't have a raspberry pi distro to test against; my initiali instinct is to order mysql after ntp; is that sufficient?
– Jeff Schaller♦
Apr 3 at 20:11
@RuiFRibeiro is a Raspberry PI. It does not have a RTC clock at all. It's a module that is sold separately and need to be plugged in (Real Time Clock RTC DS3231 GPIO Module).
– user34720
Apr 3 at 20:13
1
@RuiFRibeiro thats cool. shame on my country that has lot of taxes so, importing hardware is a pain :P
– user34720
Apr 4 at 10:48
1
1
No, i'm stuck with what i've got for now.
– Marvin Noll
Apr 3 at 12:29
No, i'm stuck with what i've got for now.
– Marvin Noll
Apr 3 at 12:29
1
1
a RTC battery is roughly 2 euros in aliexpress.
– Rui F Ribeiro
Apr 3 at 13:58
a RTC battery is roughly 2 euros in aliexpress.
– Rui F Ribeiro
Apr 3 at 13:58
I don't have a raspberry pi distro to test against; my initiali instinct is to order mysql after ntp; is that sufficient?
– Jeff Schaller♦
Apr 3 at 20:11
I don't have a raspberry pi distro to test against; my initiali instinct is to order mysql after ntp; is that sufficient?
– Jeff Schaller♦
Apr 3 at 20:11
@RuiFRibeiro is a Raspberry PI. It does not have a RTC clock at all. It's a module that is sold separately and need to be plugged in (Real Time Clock RTC DS3231 GPIO Module).
– user34720
Apr 3 at 20:13
@RuiFRibeiro is a Raspberry PI. It does not have a RTC clock at all. It's a module that is sold separately and need to be plugged in (Real Time Clock RTC DS3231 GPIO Module).
– user34720
Apr 3 at 20:13
1
1
@RuiFRibeiro thats cool. shame on my country that has lot of taxes so, importing hardware is a pain :P
– user34720
Apr 4 at 10:48
@RuiFRibeiro thats cool. shame on my country that has lot of taxes so, importing hardware is a pain :P
– user34720
Apr 4 at 10:48
|
show 5 more comments
1 Answer
1
active
oldest
votes
Since it appears that raspbian use timesyncd, I would adjust your unit file to depend on that target:
[Unit]
Description=desc
Requires=mysql.service
After=syslog.target mysql.service systemd-timesyncd
# ^^^ the addition ^^^
[Service]
Type=simple
...
If you've disabled timesyncd in favor of ntp, then substitute the NTP service name.
It appears that newer (239+) systemd versions support a time-sync service which sounds more useful, as it waits until the clock has been synchronized, versus just the beginning of the sync process.
If a short startup time isn't critical, and you find that your service is still startinb before the time has been sync'd, you may find it sufficient to add a brief delay in your service's startup with an ExecStartPre:
...
ExecStartPre=sleep 30
...
Adjust the sleep time based on experimentation with the time it reliably takes your pi to sync the time.
answered 2 hours ago
Jeff Schaller♦Jeff Schaller
45.1k1164147
add a comment |
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1 Answer
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1 Answer
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active
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votes
Since it appears that raspbian use timesyncd, I would adjust your unit file to depend on that target:
[Unit]
Description=desc
Requires=mysql.service
After=syslog.target mysql.service systemd-timesyncd
# ^^^ the addition ^^^
[Service]
Type=simple
...
If you've disabled timesyncd in favor of ntp, then substitute the NTP service name.
It appears that newer (239+) systemd versions support a time-sync service which sounds more useful, as it waits until the clock has been synchronized, versus just the beginning of the sync process.
If a short startup time isn't critical, and you find that your service is still startinb before the time has been sync'd, you may find it sufficient to add a brief delay in your service's startup with an ExecStartPre:
...
ExecStartPre=sleep 30
...
Adjust the sleep time based on experimentation with the time it reliably takes your pi to sync the time.
answered 2 hours ago
Jeff Schaller♦Jeff Schaller
45.1k1164147
add a comment |
Since it appears that raspbian use timesyncd, I would adjust your unit file to depend on that target:
[Unit]
Description=desc
Requires=mysql.service
After=syslog.target mysql.service systemd-timesyncd
# ^^^ the addition ^^^
[Service]
Type=simple
...
If you've disabled timesyncd in favor of ntp, then substitute the NTP service name.
It appears that newer (239+) systemd versions support a time-sync service which sounds more useful, as it waits until the clock has been synchronized, versus just the beginning of the sync process.
If a short startup time isn't critical, and you find that your service is still startinb before the time has been sync'd, you may find it sufficient to add a brief delay in your service's startup with an ExecStartPre:
...
ExecStartPre=sleep 30
...
Adjust the sleep time based on experimentation with the time it reliably takes your pi to sync the time.
answered 2 hours ago
Jeff Schaller♦Jeff Schaller
45.1k1164147
add a comment |
Since it appears that raspbian use timesyncd, I would adjust your unit file to depend on that target:
[Unit]
Description=desc
Requires=mysql.service
After=syslog.target mysql.service systemd-timesyncd
# ^^^ the addition ^^^
[Service]
Type=simple
...
If you've disabled timesyncd in favor of ntp, then substitute the NTP service name.
It appears that newer (239+) systemd versions support a time-sync service which sounds more useful, as it waits until the clock has been synchronized, versus just the beginning of the sync process.
If a short startup time isn't critical, and you find that your service is still startinb before the time has been sync'd, you may find it sufficient to add a brief delay in your service's startup with an ExecStartPre:
...
ExecStartPre=sleep 30
...
Adjust the sleep time based on experimentation with the time it reliably takes your pi to sync the time.
answered 2 hours ago
Jeff Schaller♦Jeff Schaller
45.1k1164147
Since it appears that raspbian use timesyncd, I would adjust your unit file to depend on that target:
[Unit]
Description=desc
Requires=mysql.service
After=syslog.target mysql.service systemd-timesyncd
# ^^^ the addition ^^^
[Service]
Type=simple
...
If you've disabled timesyncd in favor of ntp, then substitute the NTP service name.
It appears that newer (239+) systemd versions support a time-sync service which sounds more useful, as it waits until the clock has been synchronized, versus just the beginning of the sync process.
If a short startup time isn't critical, and you find that your service is still startinb before the time has been sync'd, you may find it sufficient to add a brief delay in your service's startup with an ExecStartPre:
...
ExecStartPre=sleep 30
...
Adjust the sleep time based on experimentation with the time it reliably takes your pi to sync the time.
answered 2 hours ago
Jeff Schaller♦Jeff Schaller
45.1k1164147
answered 2 hours ago
Jeff Schaller♦Jeff Schaller
45.1k1164147
answered 2 hours ago
Jeff Schaller♦Jeff Schaller
45.1k1164147
answered 2 hours ago
Jeff Schaller♦Jeff Schaller
45.1k1164147
45.1k1164147
add a comment |
add a comment |
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1
No, i'm stuck with what i've got for now.
– Marvin Noll
Apr 3 at 12:29
1
a RTC battery is roughly 2 euros in aliexpress.
– Rui F Ribeiro
Apr 3 at 13:58
I don't have a raspberry pi distro to test against; my initiali instinct is to order mysql after ntp; is that sufficient?
– Jeff Schaller♦
Apr 3 at 20:11
@RuiFRibeiro is a Raspberry PI. It does not have a RTC clock at all. It's a module that is sold separately and need to be plugged in (Real Time Clock RTC DS3231 GPIO Module).
– user34720
Apr 3 at 20:13
1
@RuiFRibeiro thats cool. shame on my country that has lot of taxes so, importing hardware is a pain :P
– user34720
Apr 4 at 10:48