I am trying to run a RAKE file from a bash script fired by a crontab:
my crontab looks like this:
* * * * * /bin/bash ~/sites/www/tweeet/get_tweeet.sh
my bash script (get_tweeet.sh) looks like this:
1 #!/bin/bash
2 set -x
3 cd /var/www/tweeet/
4 export RAILS_ENV=development
5 rake get_tweeet >> /var/www/tweeet/test.log
6 echo "$(date): cron job run " >> /var/www/tweeet/test.log
What happens is that line 6 outputs into the test.log but line 5 does now - the rake does not run.
BUT if i call the script using the exact line from the crontab
/bin/bash /var/www/tweeet/get_tweeet.sh
then it works - i'm baffled by this!
Your direct execution of the script runs because it has your full environment available. A cronjob does not, even if it belongs to the same user. So one solution is to launch it from within a full login shell. In your crontab:
bash --login -c '/var/www/tweeet/get_tweeet.sh'
I remember seeing some post about this potentially having some subtle side effects that I don't recall, but it's been working for me.
Related
I'm trying to run a script via crontab on my Raspberry Pi.
I have created the script: ScreenShot.sh
The content of the file is:
#!/bin/sh
export DISPLAY=:0 && \
import -window root -resize 20% /pathtofolder/screenshot.jpg
This works fine when I run it via SSH
/home/pi/ScreenShot.sh
I have made the script executable.
I then added it to cron via sudo crontab -e
*/1 * * * * /home/pi/ScreenShot.sh
I want the script to run ever 1 minute (I'll extend this later, but for testing purposes I have it at 1 minute).
For some reason the script does not run in crontab and does not take a screenshot.
I have noticed that if I run the script via sudo:
sudo /home/pi/ScreenShot.sh
I get the following error:
No protocol specified
import.im6: unable to open X server `:0' # error/import.c/ImportImageCommand/368.
I'm assuming when Crontab runs, it runs the script as Root, which might be causing the failure.
I enabled logging on crontab and if I view the log I see the following:
Nov 6 06:26:01 IRDigitalDisplay /USR/SBIN/CRON[12634]: (root) CMD (/home/pi/ScreenShot.sh)
Nov 6 06:26:02 IRDigitalDisplay /USR/SBIN/CRON[12633]: (CRON) info (No MTA installed, discarding output
So I'm assuming something goes wrong. However it's not writing the error to the log, but rather trying to email it to me.....
My question is:
How do I get my ImageMagick script to run in crontab, take a screen shot every X minutes, and save this into a predetermined folder?
You need to add the script to the "pi" users crontab, not root's. Start the crontab edior with this command as user "pi":
crontab -e
No sudo needed.
The crontab entry has to be:
*/5 * * * * /home/pi/ScreenShot.sh
I'm trying to execute the following shell script using crontab:
#!/bin/sh
cd /mnt/voylla-production/current
bundle exec rake maintenance:last_2_days_orders
bundle exec rake maintenance:send_last_2_days_payment_dropouts
The crontab entry is
0 16 * * * /mnt/voylla-production/releases/20131031003111/voylla_scripts/cj_4pm.sh
I'm getting the following error message in the mail:
/mnt/voylla-staging/current/voylla_scripts/cj_4pm.sh: line 3: bundle: command not found
/mnt/voylla-staging/current/voylla_scripts/cj_4pm.sh: line 4: bundle: command not found
I dont get the error when I run the commands manually. Not sure what's going on here. Could someone please point out.
Thanks
A nice trick to get all environment properly set up in crontab is to use /bin/bash -l :
0 16 * * * /bin/bash -l -c '/mnt/voylla-production/releases/20131031003111/voylla_scripts/cj_4pm.sh'
The -l option will invoke a full login shell, thus reading your bashrc file and any path / rvm setting it performs.
If you want to simplify your crontab management and use this trick - as well as others - without having to think about them, you can use the Whenever gem. It also play very nice with capistrano, if you use it, regenerating crontab on deploy.
The user used by cron does not have the correct environment.
You can tell cron which user to use. For a bash script, you can so something like:
#!/bin/bash --login
source /home/user/.bashrc
rvm use 2.0.0#gemset #if you use rvm
cd /path/to/project && bundle exec xyz
We need set right path to our bundle:
#!/bin/sh
cd /mnt/voylla-production/current
/home/youruser/.rbenv/shims/bundle exec rake maintenance:last_2_days_orders
I'm having a rough time executing script/runner with a cron and RVM. I believe the issues lie with the rvm environment not being set before the runner is executed.
currently im throwing the error
/bin/sh: 1.sql: command not found
which is more than i've gotten earlier, so i guess that's good.
I've read this thread Need to set up rvm environment prior to every cron job but im still not really getting it. Part of the problem i think is the error reporting.
this is my runner thus far.
*/1 * * * * * /bin/bash -l -c 'rvm use 1.8.7-p352#2310; cd development/app/my_app2310 && script/runner -e development "Mailer.find_customer"'
as per the above link, i tried making a rvm_cron_runner.
i created a file and placed this in it:
#!/bin/sh
source "/Users/dude/.rvm/scripts/rvm"
exec $1
then i updated my crontab to this.
*/1 * * * * * /bin/bash -l -c '/Users/dude/development/app/my_app2310/rvm_cron_runner; rvm use 1.8.7-p352#2310; cd development/app/my_app2310 && script/runner -e development "Mailer.find_customer"'
This also has made no difference. i get no error. nothing.
Can anyone see what i'm doing incorrectly?
P.S i hope my code formatting worked.
Could you try to place the code you want to run in a separate script, and then use the rvm_cron_runner ?
So place your actions in a file called /path/cron_job
rvm use 1.8.7-p352#2310
cd development/app/my_app2310 && script/runner -e development "Mailer.find_customer"
and then in your crontab write
1 2 * * * /path/rvm_cron_runner /path/cron_job
The differences:
this does not start a separate shell
use the parameter of the rvm_cron_runner
If you would use an .rvmrc file, you could even drop the rvm use ... line, I think.
You don't need to write a second cron runner (following that logic, you might as well write a third cron runner runner). Please keep things simple. All you need to do is configure your cron job to launch a bash shell, and make that bash shell load your environment.
The shebang line in your script should not refer directly to a ruby executable, but to rvm's ruby:
#!/usr/bin/env ruby
This instructs the script to load the environment and run ruby as we would on the command line with rvm loaded.
On many UNIX derived systems, crontabs can have a configuration section before the actual lines that define the jobs to be run. If this is the case, you would then specify:
SHELL=/path/to/bash
This will ensure that the cron job will be spawned from bash. Still, your environment is missing, so to instruct bash to load your environment, you will want to add to the configuration section the following:
BASH_ENV=/path/to/environment (typically .bash_profile or .bashrc)
HOME is automatically derived from the /etc/passwd line of the crontab owner, but you can override it.
HOME=/path/to/home
After this, a cron job might look like this:
15 14 1 * * $HOME/rvm_script.rb
What if your crontab doesn't support the configuration section. Well, you will have to give all the environment directives in one line, with the job itself. For example,
15 14 1 * * export BASH_ENV=/path/to/environment && /full/path/to/bash -c '/full/path/to/rvm_script.rb'
Full blog post on the subject
You can use rvm wrappers:
/home/deploy/.rvm/wrappers/ruby-2.2.4/ruby
Source: https://rvm.io/deployment/cron#direct
I'm trying to get a rails job running with CRON. All the examples I find direct me to other rails tools, plugins, gems, etc, which is good, but I really just want to use CRON, regardless. I can run my job ok with the following, but when I've tried cron I haven't had any luck (just doesn't seem to do anything). I want to run it every 3 minutes (for testing).
/usr/bin/env ruby ~/Dropbox/98_2011/webs/apps238/swapper/script/runner /home/durrantm/Dropbox/98_2011/webs/apps238/swapper/app/controllers/scheduled_emails_controller.rb
I'm on Linux Ubuntu.
My PATH has:
/var/lib/gems/1.8/bin:/home/durrantm/.rvm/gems/ruby-1.8.7-p302/bin:/home/durrantm/.rvm/gems/ruby-1.8.7-p302#global/bin:/home/durrantm/.rvm/rubies/ruby-1.8.7-p302/bin:/home/durrantm/.rvm/bin:/home/durrantm/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/pgsql/bin
Cron jobs don't load the user's environment. Try adding RAILS_ENV=production before your command within crontab, or whichever environment you need.
Example:
RAILS_ENV=production
*/3 * * * * /your/command/here
OR, if you want to make sure you have your user's full environment, execute the command within a login shell:
*/3 * * * * bash --login -c '/your/command/here'
Get rid of the home dir expansion character (replace ~ with /home/user/etc/etc) and you should be in good shape (quite likely cron's expansion of ~ doesn't match your users).
If the other parts of the syntax are bothersome there's an easy gui.
http://gnome-schedule.sourceforge.net/
sudo apt-get install gnome-schedule
You'll still have to have the path to your rb file fixed up though.
1- you might not have permissions. try running crontab -e as root
2- why don't you write to a log file to debug the issue:
*/3 * * * * /your/command/here >> /path/to/logfile
When I execute a rake task manually, it works fine but when I put the same command in Cron nothing happens:
cd /path/to/my/rails/app && rake daily_import
The Cron log indicates that the command was issues:
CMD (cd /path/to/my/rails/app && rake daily_import)
The rake task logs error and success messages, but nothing is recorded to the log, nothing is done at all. However if I copy and paste the text of the CMD with the same user Cron is running the command in everything works fine.
I'm assuming that running a task in Cron should be the same as typing it in myself, is this correct?
This thing worked for me
* * * * * /bin/bash -l -c 'cd /path/to/my/rails/app && RAILS_ENV=production bundle exec rake daily_import'
You need to specify /bin/bash -l -c before your task.
Look for mail that the cron daemon might have sent to the user under which the cron job is running. If a cron job produces output on stderr or stdout, the cron daemon will email that to the owner of the cron job. If something is going wrong (possibly because of a PATH issue, like Rob suggests above), you might see a helpful error message in an email from the cron daemon.
In case anyone is looking at this with Rails 3.2<>4.0, I had to use this in my crontab:
0 * * * * BUNDLE_GEMFILE=/path/to/rails/Gemfile /path/to/bin/bundle exec rake -f /path/to/rails/Rakefile db:hive_enrich RAILS_ENV=production > /var/log/rake_tasks.log 2>&1 &
The following solution worked for me for Rails 3 and rvm integration. I simply execute a bash script:
0 * * * * rvmuser /bin/bash -l -c '/path/to/my/bashscript > /tmp/script.log'
This doesn't seem to work without the /bin/bash -l -c part.
Then, my bash script is as follows, according to the rvm documentation:
#!/usr/bin/env bash
RAILS_ENV=production
source /var/www/rvmuser/.rvm/environments/ruby-1.9.3-p484
cd /path/to/my/rails_app
rake do:whatever
Is rake in the PATH of the cron user for running this shell?
I use the following format to run rake tasks, a little more explicit with the paths
0 * * * * /usr/bin/rake -f /path/to/Rakefile daily_import RAILS_ENV=production
I also like to redirect output to a file so I can check the errors
0 * * * * /usr/bin/rake -f /path/to/Rakefile daily_import RAILS_ENV=production > ~/daily_import.log 2>&1