Cron

Cron job for creating posts not excecuting properly

Cron job for creating posts not excecuting properly
  1. Why would a cron job not run?
  2. How do I troubleshoot crontab problems?
  3. How do I know if a cron job has failed?
  4. How do I make sure my cron job is running?
  5. How do I debug Cron?
  6. How do I restart a cron job?
  7. Is my cron working?
  8. Where do Cron errors go?
  9. How do I assign a user to crontab?
  10. How do I list cron jobs?
  11. What user does crontab run as?

Why would a cron job not run?

Root Cause

One of the most frequent causes for the crontab job not being correctly executed is that a cronjob does not run under the user's shell environment. Another reason can be – not specifying the absolute path of the commands used in the script.

How do I troubleshoot crontab problems?

I put a file in /etc/cron. hourly,daily,weekly,monthly and it doesn't run

  1. Check that the filename doesn't have an extension see run-parts.
  2. Ensure the file has execute permissions.
  3. Tell the system what to use when executing your script (eg. put #!/bin/sh at top)

How do I know if a cron job has failed?

According to this answer one can get errors of a cronjob in a log file using redirection. But you need to set the redirection with your cron job and specify the log file by yourself. And the /var/log/syslog file is always there to check if your cron job is running as you expected or not.

How do I make sure my cron job is running?

The simplest way to validate that cron tried to run the job is to simply check the appropriate log file; the log files however can be different from system to system. In order to determine which log file contains the cron logs we can simply check the occurrence of the word cron in the log files within /var/log .

How do I debug Cron?

Tips on how to debug cron:

  1. change the schedule for the cron job so it runs every minute. It's harder to debug something that happens infrequently.
  2. Make sure syslog sends cron logs to /var/log/cron.log. ...
  3. Follow the log file to track cron's activity. ...
  4. Make sure the cron job user can receive mail.

How do I restart a cron job?

Commands for RHEL/Fedora/CentOS/Scientific Linux user

  1. Start cron service. To start the cron service, use: /etc/init.d/crond start. ...
  2. Stop cron service. To stop the cron service, use: /etc/init.d/crond stop. ...
  3. Restart cron service. To restart the cron service, use: /etc/init.d/crond restart.

Is my cron working?

To check to see if the cron daemon is running, search the running processes with the ps command. The cron daemon's command will show up in the output as crond. The entry in this output for grep crond can be ignored but the other entry for crond can be seen running as root. This shows that the cron daemon is running.

Where do Cron errors go?

Popular destinations include /var/log/cron , /var/log/messages and /var/log/syslog . so you can check if crond has actually run something by looking at the mtime of /tmp/a_command_has_run .

How do I assign a user to crontab?

Or more simply, you could just run crontab -e when logged in as that user. Alternatively, you could prefix your command in your (root) crontab with sudo -u <username> to run the command as the specified user.

How do I list cron jobs?

Checking Cron via SSH

  1. You can also execute the command to show the tasks for the user you are logged in as, in this case root: crontab -l.
  2. If you need to show the cron jobs for different users, you can use the following command: crontab -u $user -l.

What user does crontab run as?

Correct? That's correct, if you run crontab -e it will execute as your user. Your scheduled cron jobs also run as your main user, but they don't use the PATH settings that your user has. For that reason, we recommend that you use the full path to any executable that you run, eg use /usr/local/bin/python2.

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