I have a simple question. I try to run a Node JS program on a Cron task via a bash script.
So, on crontab -e, I made a task #reboot that execute boot.sh :
# m h dom mon dow command
#reboot bash /home/pi/boot.sh
And my bash script :
#!/bin/sh
set -e
cd /home/pi/Sites/node-raspberry-pi/
/usr/bin/git pull
node /home/pi/Sites/node-raspberry-pi/index.js 3000 # where 3000 is the argument of my program
exit 0
When I do bash /home/pi/boot.sh, it works as supposed.
What do I miss ?
Note : both crontab -e and bash /home/pi/boot.sh are exectued as pi user.
Might be that your node cannot be found when cron is running; because cron has a limited search path. Try prefixing it with wherever you have node installed, so e.g., instead of
node /home/pi/Sites/node-raspberry-pi/index.js 3000
you would get
/usr/local/bin/node /home/pi/Sites/node-raspberry-pi/index.js 3000
You can also extend the searchpath for cron, see man 5 crontab. Hope this helps..
Related
I have a programm called opencanary running at a virtual environment at my Raspberry Pi with Ubuntu 18.04 installed. I want to restart it every 30 Minutes using crontab. For testing I set the script to run every 3 Minutes as you can see below.
When I execute the script manually it's working fine. When using crontab to run it it doesn't and I can't find out why it fails.
This is what my script looks like:
#!/bin/bash
SHELL=/bin/sh
. /home/pi/.bashrc
source /home/pi/canary-env/bin/activate && cd opencanary && opencanaryd --restart
After creating the script I added it to crontab -e:
*/3 * * * * /home/pi/restartOC.sh>>test.log
When I look at the cron.log file I can see that the script is executed:
Sep 29 08:33:01 DiskStation CRON[20880]: (pi) CMD (cd /home/pi && sh restartOC.sh>>test.log)
the test.log file stays empty.
Does someone know what I am doing wrong?
Edit 05.10.2021
At the github of opencanary I was told that I don't have to use the 'cd opencanary'. I followed the advice and edited my script:
#!/bin/bash
SHELL=/bin/sh
. /home/pi/.bashrc
source /home/pi/canary-env/bin/activate && opencanaryd --restart
The script is still working when executed manual but The Problem does still exist when running the script from cron.
I solved the problem by calling 'which opencanaryd' at the terminal
this will return the path where the opencanaryd command is located.
In my case it is /usr/local/bin/opencanaryd
With this knowledge it is possible to edit the script so cron can find the command:
#!/bin/bash
SHELL=/bin/sh
. /home/pi/.bashrc
cd /usr/local/bin/ && . opencanaryd --restart
I would like to run a specific script at a certain time (only once!). If I run it normally like this:
marc#Marc-Linux:~/tennis_betting_strategy1/wrappers$ Rscript write_csv2.R
It does work. I however would like to program it in a cronjob to run at 10:50 and therefore did the following:
50 10 11 05 * Rscript ~/csv_file/write_csv.R
This does not seem to work however. Any thoughts where I go wrong? These are the details of the cron package im
using:
PID COMMAND
1015 cron
My system time also checks out:
marc#Marc-Linux:~/tennis_betting_strategy1/wrappers$ date
wo mei 11 10:56:46 CEST 2016
There is a special tool for running commands only once - at.
With at you can schedule a command like this:
at 09:05 am today
at> enter you commands...
Note, you'll need the atd daemon running.
Your crontab entry looks okay, however. I'd suggest checking if the cron daemon is running(exact daemon name depends on the cron package; it could be cron, crond, or vixie-cron, for instance). One way to check if the daemon is running is to use the ps command, e.g.:
$ ps -C cron -o pid,args
PID COMMAND
306 /usr/sbin/cron
Some advices.
Read more about the PATH variable. Notice that it is set differently in interactive shells (see your ~/.bashrc) and in cron or at jobs. See also this about Rscript.
Replace your command by a shell script, e.g. in ~/bin/myrscriptjob.sh
That myrscriptjob.sh file should start with #!/bin/sh
Be sure to make that shell script executable:
chmod u+x ~/bin/myrscriptjob.sh
Add some logging in your shell script, near the start; either use logger(1) or at least some date(1) command suitably redirected, or even both:
#!/bin/sh
# file myrscriptjob.sh
/bin/date +"myrscriptjob starting %c %n" > /tmp/myrscriptjob.start
/usr/bin/logger -t myrscript job starting $$
/usr/local/bin/Rscript $HOME/csv_file/write_csv.R
in the last line above, replace /usr/local/bin/Rscript by the output of which Rscript done in some interactive terminal.
Notice that you should not use ~ (but replace them with $HOME when appropriate) in shell scripts.
Finally, use at to run your script once. If you want to run it periodically in a crontab job, give the absolute path, e.g.
5 09 11 05 * $HOME/bin/myrscriptjob.sh
and check in /tmp/myrscriptjob.start and in your system log if it has started successfully.
BTW, in your myrscriptjob.sh script, you might replace the first line #!/bin/sh with #!/bin/sh -vx (then the shell is verbose about execution, and cron or at will send you some email). See dash(1), bash(1), execve(2)
Use full path (started from /) for both Rscript and write_csv2.R. Check sample command as follows
/tmp/myscript/Rscript /tmp/myfile/write_csv2.R
Ensure you have execution permission of Rscript and write permission in folder where write_csv2.R will be created(/tmp/myfile)
I have a LAMP container with supervisor.
I add a simple cron
* * * * * root /bin/date >> /var/log/cron.log
from my Dockerfile
ADD ./crons/test /etc/cron.d/test
RUN chmod 0777 /etc/cron.d/test
I start cron via supervisor with a supervisor-cron.conf like this:
[program:cron]
command=/bin/bash -c "cron -f"
numprocs=1
autostart=true
autorestart=true
startretries=2
Cron starts fine and stays up and running. The strange thing is that no cronjob is running automatically [as it should] but when I execute docker exec lamp crontab /etc/cron.d/test the cron job starts and works as expected.
Am I missing something? Everywhere I have read that cron jobs are executed automatically by cron.
I solved it.
I tried both setting them up in /etc/crontab and /etc/cron.d/ .
Cron didn’t auto-start the cron jobs .
However, when I run docker exec lamp crontab /etc/cron.d/my_cronjob_file all played nice. This made me suspicious , and then I read this . So, after adding my_cronjob_file in the container [in the dockerfile] I added RUN crontab /etc/cron.d/my_cronjob_file . This essentially ‘installs’ the cronjob to the crontab table. [I don’t know the internals of cron/tab but that’s the gist I understood.] .
After that , the cron service comes up by supervisor and the cronjob runs like a charm.
This can be solved with the bash file, due to the layered architecture of the Docker, cron service doesn't get initiated with RUN/CMD/ENTRYPOINT commands.
Simply add a bash file which will initiate the cron and other services (if required)
DockerFile
FROM gradle:6.5.1-jdk11 AS build
# apt
RUN apt-get update
RUN apt-get -y install cron
# Setup cron to run every minute to print (you can add/update your cron here)
RUN touch /var/log/cron-1.log
RUN (crontab -l ; echo "* * * * * echo testing cron.... >> /var/log/cron-1.log 2>&1") | crontab
# entrypoint.sh
RUN chmod +x entrypoint.sh
CMD ["bash","entrypoint.sh"]
entrypoint.sh
#!/bin/sh
service cron start & tail -f /var/log/cron-2.log
If any other service is also required to run along with cron then add that service with & in the same command, for example: /opt/wildfly/bin/standalone.sh & service cron start & tail -f /var/log/cron-2.log
Once you will get into the docker container there you can see that testing cron.... will be getting printed every minute in file: /var/log/cron-1.log
I need a shell script that would run two .sh files which are in the directory: /opt/tomcat-latest/bin
#!/bin/sh
cd /opt/tomcat-latest/bin
./shutdown.sh
./startup.sh
Would this code achieve my goal? If so how do I make it on a cron job that runs every 2 hours? I have a Linux Centos VPS and DirectAdmin admin panel.
I think the easiest solution would be to run directly the commands with its full path from cron, instead of using a sh script.
Something like this in the crontab would work :
* */2 * * * /opt/tomcat-latest/bin/shutdown.sh && /opt/tomcat-latest/bin/startup.sh
That would run every 2 hours
you can edit crontab with crontab -e and check the crontab syntax here : https://fr.wikipedia.org/wiki/Crontab
I created a cronjob with the command crontab -e:
*/1 * * * * /var/lib/tomcat/webapps/ROOT/WEB-INF/scripts/test.sh
This file test.sh should be executed every minute. But it doesn't work.
If I run the script manually it works fine. So I think the problem is the cronjob not the script ;)
Are there any permissions or something else which block the cronjob?
Is the cronjob syntax correct?
Thx
For a start, you don't need the /1 if you want it done every minute. Just setting the minute field to * will do.
Next, you should place, as the first lines in your test script (though after the #! line if it's there):
env >/tmp/test.sh.dummy
set >>/tmp/test.sh.dummy
and see if that file shows up.
That will tell you if the script is running or not.
If it's not running, check to make sure cron itself is running:
pax> ps -ef | grep cron | grep -v grep
root 1048 1 0 08:45 ? 00:00:00 cron
(mine is).
If it is running, the most likely problem is that the environment under which cron runs your jobs is nowhere near the environment your shell gives you. Examine the differences between what was output to your /tmp/test.sh.dummy file and what your shell gives your when you execute env ; set.