Cron Job Error Output

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Cron Job Output To Log

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Cron Job Output To Dev Null

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Cron Job Output To Email

up and rise to the top How to detect error in cron jobs up vote 3 down vote favorite 1 The reasons why a cron job may fail is really very large. Most common reasons may be, Syntax error Using executable without proper path Using a shell variable which is not defined in cron environment Attempt to open a GUI without specifying DISPLAY And so on... Sometimes it is cron job error handling really difficult to understand which error is preventing the job to be executed. Is there a way to detect error(s) in a cron jobs? cron troubleshooting share|improve this question asked Feb 8 '14 at 19:06 souravc 13.7k34772 add a comment| 1 Answer 1 active oldest votes up vote 2 down vote accepted Setup Local Mail and get cron job output mails When a cron job starts successfully or fails to execute for some reason cron daemon automatically sends an email to the user who set the cron job. That mail contains the description of a successful job or the detailed report why the particular cron job failed. If your local mail system is not set you will not receive those mails. The cron job output emails will just die in a local mail spool folder. So you need to set up your mailer daemon to read those mails. See this answer on How read local email in thunderbird to get all your local mails. If your cronjob fails you will receive a mail stating the reason of failure. This is one of the best way to detect the error in setting a cron job. Alternate ways According to this answer one can

it daily. How do I verify whether the backup cron script job ran successfully? Also, I have several echo statements inside my send cron output to dev null backup.sh shell script. How do I save the output of my script using cron to a log file when it is executed as a cron job? Answer: Let us say that you've added the crontab error log ubuntu backup.sh to your crontab as shown below to execute it at midnight every day. $ crontab -e 59 23 * * * /home/john/bin/backup.sh To verify whether the this job got executed successfully http://askubuntu.com/questions/418237/how-to-detect-error-in-cron-jobs or not, check the /var/log/cron file, which contains information about all the cron jobs that gets executed in your system. As you see from the following output, john's cron job got executed succesfully. $ tail /var/log/cron Oct 8 22:00:00 dev-db crond[18340]: (root) CMD (/bin/sh /home/root/bin/system_check &) Oct 8 23:00:00 dev-db crond[20348]: (oracle) CMD (/bin/sh /home/oracle/bin/cleanup.sh &) Oct 8 23:59:00 dev-db crond[20399]: (john) CMD (/bin/sh /home/john/bin/backup.sh http://www.thegeekstuff.com/2012/07/crontab-log/ &) Cron log contains the following information: Timestamp - The date and time when the cron job was executed Hostname - The hostname of the server (For example, dev-db) The cron deamon name and the PID. For example, crond[20399] Username - The username under which this cron job got executed. For example, john. CMD - Anything following this is the real command that got executed at that time. If there are any echo statements inside the backup.sh, you might want to log those into a file. In general, if the backup.sh cron script throws any output (including errors), you might want to log those to a log file. To do this, modify the crontab entry and add the output and error redirection as shown below. $ crontab -e 59 23 * * * /home/john/bin/backup.sh > /home/john/logs/backup.log 2>&1 In the above: > /home/john/logs/backup.log indicates that the standard output of the backup.sh script will be redirected to the backup.log file. 2>&1 indicates that the standard error (2>) is redirected to the same file descriptor that is pointed by standard output (&1). So, both standard output and error will be redirected to /home/john/logs/backup.log Tweet

Support Search GitHub This repository Watch 124 Star 6,652 Fork 612 javan/whenever Code Issues 32 https://github.com/javan/whenever/wiki/Output-redirection-aka-logging-your-cron-jobs Pull requests 22 Projects 0 Wiki Pulse Graphs Output redirection aka logging your cron jobs Cheng Zheng edited this page Jul 31, 2016 · 6 revisions http://serverfault.com/questions/226074/cron-only-get-errors-in-emails Pages 10 Home Adding jobs to another users crontab Exclusive cron task lock with flock Output redirection aka logging your cron jobs People using Whenever RVM cron job Notes Sending Emails Setting variables on the fly Troubleshooting Using Whenever on AWS Elastic Beanstalk Clone this wiki locally Clone in Desktop In your schedule.rb file you can specify the redirection options for your commands at a global or command level by setting the 'output' variable. This example is global level: # adds cron job output ">> /path/to/file.log 2>&1" to all commands set :output, '/path/to/file.log' and you should put this global level set :output above your job definition, otherwise it wouldn't work Example: # This work set :output, {:error => '~/Desktop/z.error.log', :standard => '~/Desktop/z.standard.log'} every 1.minute do command "python ~/Desktop/whe/config/z.py" end every 1.minute do command "python ~/Desktop/whe/config/z.py" end # This won't work set :output, {:error => '~/Desktop/z.error.log', :standard => '~/Desktop/z.standard.log'} Rails.root and RAILS_ROOT will be unavailable, however Whenever.path (or just path) will deliver the Rails root path in most cases. Alternatively, if you want to access environment or application config values, simply add # makes Rails.root as well as other environment specific Rails.application.config values available require File.expand_path(File.dirname(__FILE__) + "/environment") Or you can STDOUT and STDERR separately, # adds ">> cron.log 2> error.log" to all commands set :output, {:error => 'error.log', :standard => 'cron.log'} # adds ">> cron.log" to all commands set :output, {:standard => 'cron.log'} # adds "2> error.log" to all commands set

Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Cron: Only get errors in emails? up vote 22 down vote favorite 5 I finally set up a realistic backup schedule on my data through a shell script, which are handled by cron on tight intervals. Unfortunately, I keep getting empty emails each time the CRON has been executed and not only when things go wrong. Is it possible to only make CRON send emails when something goes wrong, ie. my TAR doesn't execute as intended? Here's how my crontab is setup for the moment; 0 */2 * * * /bin/backup.sh 2>&1 | mail -s "Backup status" email@example.com Thanks a lot! bash shell cron schedule share|improve this question asked Jan 24 '11 at 9:40 Industrial 53921535 add a comment| 4 Answers 4 active oldest votes up vote 32 down vote accepted Ideally you'd want your backup script to output nothing if everything goes as expected and only produce output when something goes wrong. Then use the MAILTO environment variable to send any output generated by your script to your email address. MAILTO=email@example.com 0 */2 * * * /bin/backup.sh If your script normally produces output but you don't care about it in cron, just sent it to /dev/null and it'll email you only when something is written to stderr. MAILTO=email@example.com 0 */2 * * * /bin/backup.sh > /dev/null share|improve this answer answered Jan 24 '11 at 9:53 Cakemox 13.1k52957 add a comment| up vote 8 down vote Using cronic wrapper script looks like a good idea; to use it you don't have to change your scripts. Instead of: 0 1 * * * backup >/dev/null 2>&1 do: 0 1 * * * cronic backup More info on http://habilis.net/cronic/. share|improve this answer edited Sep 8 at 11:39 Law29 2,3731319 answered Feb 13 '12 at 21:43 Ricardo Pardini 41638 I really don't see how that will help when the problem is nothing more than an incorrect cron line and cron is doing exactly what it is told to do. –John Gardeniers Feb 14 '12 at 0:17 @JohnGardeniers it helps because sometimes you have output without an error. –