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Why does cron start twice every night?
Crontab Output problemRunning CRON job on Ubuntu server for SugarCRMHow to stop cron from mailing me?Cron fails at nightCron doesn't execute one of the scheduled jobsRemoving Prior Crontabs
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1
I run on Ubuntu 18.04.2 and use cron for various script management and watchdog. In particular I restart some daemontools process every night.
For some unknown reason, every morning I find a double instance of cron
ps -A | grep cron
I can kill it manually and could automate it of course, but I would'nt understand why.
I looked into /etc/cron.* and could not find unexpected double scripts.
Which part of Ubuntu rules cron?
pgrep -a cron;
1221 /usr/sbin/cron -f
3811 /usr/sbin/CRON -f
systemctl status cron.service
● cron.service - Regular background program processing daemon
Loaded: loaded (/lib/systemd/system/cron.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2019-04-17 00:50:51 UTC; 1 day 13h ago
Docs: man:cron(8)
Main PID: 1221 (cron)
Tasks: 16
Memory: 544.0M
CPU: 1d 11h 10min 53.180s
CGroup: /system.slice/cron.service
├─ 1221 /usr/sbin/cron -f
├─ 3811 /usr/sbin/CRON -f
├─ 3814 /bin/sh -c /root/civilia/general/admin_server/minuteRoutine.sh
├─ 3815 /bin/sh /root/civilia/general/admin_server/minuteRoutine.sh
├─ 3816 /bin/sh /root/civilia/Candiac/tech/parkingMonitoring-LoRa/prediction.sh
├─ 3817 /usr/lib/R/bin/exec/R --slave --no-restore --file=/root/civilia/Candiac/tech/parkingMonitoring-LoRa//prediction.R
├─ 6069 /bin/sh -c /root/civilia/general/admin_server/minuteRoutine.sh
├─ 6070 /bin/sh /root/civilia/general/admin_server/minuteRoutine.sh
├─ 6071 /bin/sh /root/civilia/Candiac/tech/parkingMonitoring-LoRa/prediction.sh
├─ 6073 /usr/lib/R/bin/exec/R --slave --no-restore --file=/root/civilia/Candiac/tech/parkingMonitoring-LoRa//prediction.R
├─27218 /usr/sbin/CRON -f
├─27221 /bin/sh -c /root/civilia/general/admin_server/minuteRoutine.sh
├─27222 /bin/sh /root/civilia/general/admin_server/minuteRoutine.sh
├─27538 /bin/bash /root/civilia/STS/gtfs-rt/scripts/watchDog.sh
├─28014 bash /var/svc.d/STSAG-create-gtfs-rt/esclave.sh rs
└─28028 sleep 5
Apr 18 14:36:02 VM-001 CRON[24186]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:36:02 VM-001 CRON[24187]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:36:02 VM-001 CRON[24188]: (root) CMD (php /var/www/html/public_html/portail-Civilia/cron/disconnectionTracker.php > /dev/null )
Apr 18 14:36:02 VM-001 CRON[24189]: (root) CMD (/root/civilia/general/admin_server/minuteRoutine.sh)
Apr 18 14:36:02 VM-001 CRON[24186]: pam_unix(cron:session): session closed for user root
Apr 18 14:36:10 VM-001 CRON[24187]: pam_unix(cron:session): session closed for user root
Apr 18 14:38:02 VM-001 CRON[27217]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:38:02 VM-001 CRON[27219]: (root) CMD (php /var/www/html/public_html/portail-Civilia/cron/disconnectionTracker.php > /dev/null )
Apr 18 14:38:02 VM-001 CRON[27218]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:38:02 VM-001 CRON[27221]: (root) CMD (/root/civilia/general/admin_server/minuteRoutine.sh)
18.04 bash cron
asked Apr 17 at 19:45
Xavier PrudentXavier Prudent
1064 bronze badges
add a comment
|
1
I run on Ubuntu 18.04.2 and use cron for various script management and watchdog. In particular I restart some daemontools process every night.
For some unknown reason, every morning I find a double instance of cron
ps -A | grep cron
I can kill it manually and could automate it of course, but I would'nt understand why.
I looked into /etc/cron.* and could not find unexpected double scripts.
Which part of Ubuntu rules cron?
pgrep -a cron;
1221 /usr/sbin/cron -f
3811 /usr/sbin/CRON -f
systemctl status cron.service
● cron.service - Regular background program processing daemon
Loaded: loaded (/lib/systemd/system/cron.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2019-04-17 00:50:51 UTC; 1 day 13h ago
Docs: man:cron(8)
Main PID: 1221 (cron)
Tasks: 16
Memory: 544.0M
CPU: 1d 11h 10min 53.180s
CGroup: /system.slice/cron.service
├─ 1221 /usr/sbin/cron -f
├─ 3811 /usr/sbin/CRON -f
├─ 3814 /bin/sh -c /root/civilia/general/admin_server/minuteRoutine.sh
├─ 3815 /bin/sh /root/civilia/general/admin_server/minuteRoutine.sh
├─ 3816 /bin/sh /root/civilia/Candiac/tech/parkingMonitoring-LoRa/prediction.sh
├─ 3817 /usr/lib/R/bin/exec/R --slave --no-restore --file=/root/civilia/Candiac/tech/parkingMonitoring-LoRa//prediction.R
├─ 6069 /bin/sh -c /root/civilia/general/admin_server/minuteRoutine.sh
├─ 6070 /bin/sh /root/civilia/general/admin_server/minuteRoutine.sh
├─ 6071 /bin/sh /root/civilia/Candiac/tech/parkingMonitoring-LoRa/prediction.sh
├─ 6073 /usr/lib/R/bin/exec/R --slave --no-restore --file=/root/civilia/Candiac/tech/parkingMonitoring-LoRa//prediction.R
├─27218 /usr/sbin/CRON -f
├─27221 /bin/sh -c /root/civilia/general/admin_server/minuteRoutine.sh
├─27222 /bin/sh /root/civilia/general/admin_server/minuteRoutine.sh
├─27538 /bin/bash /root/civilia/STS/gtfs-rt/scripts/watchDog.sh
├─28014 bash /var/svc.d/STSAG-create-gtfs-rt/esclave.sh rs
└─28028 sleep 5
Apr 18 14:36:02 VM-001 CRON[24186]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:36:02 VM-001 CRON[24187]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:36:02 VM-001 CRON[24188]: (root) CMD (php /var/www/html/public_html/portail-Civilia/cron/disconnectionTracker.php > /dev/null )
Apr 18 14:36:02 VM-001 CRON[24189]: (root) CMD (/root/civilia/general/admin_server/minuteRoutine.sh)
Apr 18 14:36:02 VM-001 CRON[24186]: pam_unix(cron:session): session closed for user root
Apr 18 14:36:10 VM-001 CRON[24187]: pam_unix(cron:session): session closed for user root
Apr 18 14:38:02 VM-001 CRON[27217]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:38:02 VM-001 CRON[27219]: (root) CMD (php /var/www/html/public_html/portail-Civilia/cron/disconnectionTracker.php > /dev/null )
Apr 18 14:38:02 VM-001 CRON[27218]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:38:02 VM-001 CRON[27221]: (root) CMD (/root/civilia/general/admin_server/minuteRoutine.sh)
18.04 bash cron
asked Apr 17 at 19:45
Xavier PrudentXavier Prudent
1064 bronze badges
2
please add the results of the command too. systemd rules cron :+
– Rinzwind
Apr 17 at 20:42
2
On thing are the scripts that cron starts and other cron itself. Please add the output of your command or probably better this one:pgrep -a cron; systemctl status cron.service.
– Pablo A
Apr 18 at 2:36
/usr/sbin/CRONis running as process 3811. Take a look at that file with thefilecommand and maybestrings -n 6 | lessto see what it is/what's in it. My kubuntu 18.04 system doesn't have that file, so it's probably some sort of script that works with the actualcron-/usr/sbin/cron. It has a higher process number, so it may have been started later thancron(not guaranteed - process IDs wrap).
– Joe
Apr 25 at 1:05
Ifcronwere really running twice every night, it would do all the jobs incrontabtwice. If you create a script that just appends the output ofdateto a file and add it tocrontabas a daily job, you'll see immediately (the next day) exactly when it ran and if it ran more than once in the same day.
– Joe
Apr 25 at 1:21
Thank you Joe, the script that seems to be running twice is a minute-wise one (minuteRoutine.sh). It looks like it started as I included flock -xn for each process.
– Xavier Prudent
Apr 25 at 17:49
add a comment
|
1
1
1
1
I run on Ubuntu 18.04.2 and use cron for various script management and watchdog. In particular I restart some daemontools process every night.
For some unknown reason, every morning I find a double instance of cron
ps -A | grep cron
I can kill it manually and could automate it of course, but I would'nt understand why.
I looked into /etc/cron.* and could not find unexpected double scripts.
Which part of Ubuntu rules cron?
pgrep -a cron;
1221 /usr/sbin/cron -f
3811 /usr/sbin/CRON -f
systemctl status cron.service
● cron.service - Regular background program processing daemon
Loaded: loaded (/lib/systemd/system/cron.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2019-04-17 00:50:51 UTC; 1 day 13h ago
Docs: man:cron(8)
Main PID: 1221 (cron)
Tasks: 16
Memory: 544.0M
CPU: 1d 11h 10min 53.180s
CGroup: /system.slice/cron.service
├─ 1221 /usr/sbin/cron -f
├─ 3811 /usr/sbin/CRON -f
├─ 3814 /bin/sh -c /root/civilia/general/admin_server/minuteRoutine.sh
├─ 3815 /bin/sh /root/civilia/general/admin_server/minuteRoutine.sh
├─ 3816 /bin/sh /root/civilia/Candiac/tech/parkingMonitoring-LoRa/prediction.sh
├─ 3817 /usr/lib/R/bin/exec/R --slave --no-restore --file=/root/civilia/Candiac/tech/parkingMonitoring-LoRa//prediction.R
├─ 6069 /bin/sh -c /root/civilia/general/admin_server/minuteRoutine.sh
├─ 6070 /bin/sh /root/civilia/general/admin_server/minuteRoutine.sh
├─ 6071 /bin/sh /root/civilia/Candiac/tech/parkingMonitoring-LoRa/prediction.sh
├─ 6073 /usr/lib/R/bin/exec/R --slave --no-restore --file=/root/civilia/Candiac/tech/parkingMonitoring-LoRa//prediction.R
├─27218 /usr/sbin/CRON -f
├─27221 /bin/sh -c /root/civilia/general/admin_server/minuteRoutine.sh
├─27222 /bin/sh /root/civilia/general/admin_server/minuteRoutine.sh
├─27538 /bin/bash /root/civilia/STS/gtfs-rt/scripts/watchDog.sh
├─28014 bash /var/svc.d/STSAG-create-gtfs-rt/esclave.sh rs
└─28028 sleep 5
Apr 18 14:36:02 VM-001 CRON[24186]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:36:02 VM-001 CRON[24187]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:36:02 VM-001 CRON[24188]: (root) CMD (php /var/www/html/public_html/portail-Civilia/cron/disconnectionTracker.php > /dev/null )
Apr 18 14:36:02 VM-001 CRON[24189]: (root) CMD (/root/civilia/general/admin_server/minuteRoutine.sh)
Apr 18 14:36:02 VM-001 CRON[24186]: pam_unix(cron:session): session closed for user root
Apr 18 14:36:10 VM-001 CRON[24187]: pam_unix(cron:session): session closed for user root
Apr 18 14:38:02 VM-001 CRON[27217]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:38:02 VM-001 CRON[27219]: (root) CMD (php /var/www/html/public_html/portail-Civilia/cron/disconnectionTracker.php > /dev/null )
Apr 18 14:38:02 VM-001 CRON[27218]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:38:02 VM-001 CRON[27221]: (root) CMD (/root/civilia/general/admin_server/minuteRoutine.sh)
18.04 bash cron
asked Apr 17 at 19:45
Xavier PrudentXavier Prudent
1064 bronze badges
I run on Ubuntu 18.04.2 and use cron for various script management and watchdog. In particular I restart some daemontools process every night.
For some unknown reason, every morning I find a double instance of cron
ps -A | grep cron
I can kill it manually and could automate it of course, but I would'nt understand why.
I looked into /etc/cron.* and could not find unexpected double scripts.
Which part of Ubuntu rules cron?
pgrep -a cron;
1221 /usr/sbin/cron -f
3811 /usr/sbin/CRON -f
systemctl status cron.service
● cron.service - Regular background program processing daemon
Loaded: loaded (/lib/systemd/system/cron.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2019-04-17 00:50:51 UTC; 1 day 13h ago
Docs: man:cron(8)
Main PID: 1221 (cron)
Tasks: 16
Memory: 544.0M
CPU: 1d 11h 10min 53.180s
CGroup: /system.slice/cron.service
├─ 1221 /usr/sbin/cron -f
├─ 3811 /usr/sbin/CRON -f
├─ 3814 /bin/sh -c /root/civilia/general/admin_server/minuteRoutine.sh
├─ 3815 /bin/sh /root/civilia/general/admin_server/minuteRoutine.sh
├─ 3816 /bin/sh /root/civilia/Candiac/tech/parkingMonitoring-LoRa/prediction.sh
├─ 3817 /usr/lib/R/bin/exec/R --slave --no-restore --file=/root/civilia/Candiac/tech/parkingMonitoring-LoRa//prediction.R
├─ 6069 /bin/sh -c /root/civilia/general/admin_server/minuteRoutine.sh
├─ 6070 /bin/sh /root/civilia/general/admin_server/minuteRoutine.sh
├─ 6071 /bin/sh /root/civilia/Candiac/tech/parkingMonitoring-LoRa/prediction.sh
├─ 6073 /usr/lib/R/bin/exec/R --slave --no-restore --file=/root/civilia/Candiac/tech/parkingMonitoring-LoRa//prediction.R
├─27218 /usr/sbin/CRON -f
├─27221 /bin/sh -c /root/civilia/general/admin_server/minuteRoutine.sh
├─27222 /bin/sh /root/civilia/general/admin_server/minuteRoutine.sh
├─27538 /bin/bash /root/civilia/STS/gtfs-rt/scripts/watchDog.sh
├─28014 bash /var/svc.d/STSAG-create-gtfs-rt/esclave.sh rs
└─28028 sleep 5
Apr 18 14:36:02 VM-001 CRON[24186]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:36:02 VM-001 CRON[24187]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:36:02 VM-001 CRON[24188]: (root) CMD (php /var/www/html/public_html/portail-Civilia/cron/disconnectionTracker.php > /dev/null )
Apr 18 14:36:02 VM-001 CRON[24189]: (root) CMD (/root/civilia/general/admin_server/minuteRoutine.sh)
Apr 18 14:36:02 VM-001 CRON[24186]: pam_unix(cron:session): session closed for user root
Apr 18 14:36:10 VM-001 CRON[24187]: pam_unix(cron:session): session closed for user root
Apr 18 14:38:02 VM-001 CRON[27217]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:38:02 VM-001 CRON[27219]: (root) CMD (php /var/www/html/public_html/portail-Civilia/cron/disconnectionTracker.php > /dev/null )
Apr 18 14:38:02 VM-001 CRON[27218]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 18 14:38:02 VM-001 CRON[27221]: (root) CMD (/root/civilia/general/admin_server/minuteRoutine.sh)
18.04 bash cron
18.04 bash cron
asked Apr 17 at 19:45
Xavier PrudentXavier Prudent
1064 bronze badges
asked Apr 17 at 19:45
Xavier PrudentXavier Prudent
1064 bronze badges
edited Apr 18 at 14:39
Xavier Prudent
asked Apr 17 at 19:45
Xavier PrudentXavier Prudent
1064 bronze badges
asked Apr 17 at 19:45
Xavier PrudentXavier Prudent
1064 bronze badges
asked Apr 17 at 19:45
Xavier PrudentXavier Prudent
1064 bronze badges
1064 bronze badges
2
please add the results of the command too. systemd rules cron :+
– Rinzwind
Apr 17 at 20:42
2
On thing are the scripts that cron starts and other cron itself. Please add the output of your command or probably better this one:pgrep -a cron; systemctl status cron.service.
– Pablo A
Apr 18 at 2:36
/usr/sbin/CRONis running as process 3811. Take a look at that file with thefilecommand and maybestrings -n 6 | lessto see what it is/what's in it. My kubuntu 18.04 system doesn't have that file, so it's probably some sort of script that works with the actualcron-/usr/sbin/cron. It has a higher process number, so it may have been started later thancron(not guaranteed - process IDs wrap).
– Joe
Apr 25 at 1:05
Ifcronwere really running twice every night, it would do all the jobs incrontabtwice. If you create a script that just appends the output ofdateto a file and add it tocrontabas a daily job, you'll see immediately (the next day) exactly when it ran and if it ran more than once in the same day.
– Joe
Apr 25 at 1:21
Thank you Joe, the script that seems to be running twice is a minute-wise one (minuteRoutine.sh). It looks like it started as I included flock -xn for each process.
– Xavier Prudent
Apr 25 at 17:49
add a comment
|
2
please add the results of the command too. systemd rules cron :+
– Rinzwind
Apr 17 at 20:42
2
On thing are the scripts that cron starts and other cron itself. Please add the output of your command or probably better this one:pgrep -a cron; systemctl status cron.service.
– Pablo A
Apr 18 at 2:36
/usr/sbin/CRONis running as process 3811. Take a look at that file with thefilecommand and maybestrings -n 6 | lessto see what it is/what's in it. My kubuntu 18.04 system doesn't have that file, so it's probably some sort of script that works with the actualcron-/usr/sbin/cron. It has a higher process number, so it may have been started later thancron(not guaranteed - process IDs wrap).
– Joe
Apr 25 at 1:05
Ifcronwere really running twice every night, it would do all the jobs incrontabtwice. If you create a script that just appends the output ofdateto a file and add it tocrontabas a daily job, you'll see immediately (the next day) exactly when it ran and if it ran more than once in the same day.
– Joe
Apr 25 at 1:21
Thank you Joe, the script that seems to be running twice is a minute-wise one (minuteRoutine.sh). It looks like it started as I included flock -xn for each process.
– Xavier Prudent
Apr 25 at 17:49
2
2
please add the results of the command too. systemd rules cron :+
– Rinzwind
Apr 17 at 20:42
please add the results of the command too. systemd rules cron :+
– Rinzwind
Apr 17 at 20:42
2
2
On thing are the scripts that cron starts and other cron itself. Please add the output of your command or probably better this one:
pgrep -a cron; systemctl status cron.service.– Pablo A
Apr 18 at 2:36
On thing are the scripts that cron starts and other cron itself. Please add the output of your command or probably better this one:
pgrep -a cron; systemctl status cron.service.– Pablo A
Apr 18 at 2:36
/usr/sbin/CRON is running as process 3811. Take a look at that file with the file command and maybe strings -n 6 | less to see what it is/what's in it. My kubuntu 18.04 system doesn't have that file, so it's probably some sort of script that works with the actual cron - /usr/sbin/cron. It has a higher process number, so it may have been started later than cron (not guaranteed - process IDs wrap).– Joe
Apr 25 at 1:05
/usr/sbin/CRON is running as process 3811. Take a look at that file with the file command and maybe strings -n 6 | less to see what it is/what's in it. My kubuntu 18.04 system doesn't have that file, so it's probably some sort of script that works with the actual cron - /usr/sbin/cron. It has a higher process number, so it may have been started later than cron (not guaranteed - process IDs wrap).– Joe
Apr 25 at 1:05
If
cron were really running twice every night, it would do all the jobs in crontab twice. If you create a script that just appends the output of date to a file and add it to crontab as a daily job, you'll see immediately (the next day) exactly when it ran and if it ran more than once in the same day.– Joe
Apr 25 at 1:21
If
cron were really running twice every night, it would do all the jobs in crontab twice. If you create a script that just appends the output of date to a file and add it to crontab as a daily job, you'll see immediately (the next day) exactly when it ran and if it ran more than once in the same day.– Joe
Apr 25 at 1:21
Thank you Joe, the script that seems to be running twice is a minute-wise one (minuteRoutine.sh). It looks like it started as I included flock -xn for each process.
– Xavier Prudent
Apr 25 at 17:49
Thank you Joe, the script that seems to be running twice is a minute-wise one (minuteRoutine.sh). It looks like it started as I included flock -xn for each process.
– Xavier Prudent
Apr 25 at 17:49
add a comment
|
0
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2
please add the results of the command too. systemd rules cron :+
– Rinzwind
Apr 17 at 20:42
2
On thing are the scripts that cron starts and other cron itself. Please add the output of your command or probably better this one:
pgrep -a cron; systemctl status cron.service.– Pablo A
Apr 18 at 2:36
/usr/sbin/CRONis running as process 3811. Take a look at that file with thefilecommand and maybestrings -n 6 | lessto see what it is/what's in it. My kubuntu 18.04 system doesn't have that file, so it's probably some sort of script that works with the actualcron-/usr/sbin/cron. It has a higher process number, so it may have been started later thancron(not guaranteed - process IDs wrap).– Joe
Apr 25 at 1:05
If
cronwere really running twice every night, it would do all the jobs incrontabtwice. If you create a script that just appends the output ofdateto a file and add it tocrontabas a daily job, you'll see immediately (the next day) exactly when it ran and if it ran more than once in the same day.– Joe
Apr 25 at 1:21
Thank you Joe, the script that seems to be running twice is a minute-wise one (minuteRoutine.sh). It looks like it started as I included flock -xn for each process.
– Xavier Prudent
Apr 25 at 17:49