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Tom
Asked: 2012-08-16 08:15:07 +0800 CST

Why isn't my cronjob running?

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I have a cronjob in /etc/cron.d/mycron that looks like this:

0 3 * * * apache php /path/to/my/script.php

In the same file there are other cronjobs begin run as root and other users (which work), but for some reason this job running as apache isn't running and isn't reporting anything in /var/log/messages or sending anything to the MAILTO address in the cron file. When I su apache and run the cronjob's command, it works fine, but cron doesn't like it.

This is a long running problem for me and so far I have gathered the following possibilities:

  • The apache user doesn't have a home directory (the other cron users do), and crond doesn't like this.
  • There's some PAM or /etc/security/access.conf setting blocking apache using crond, although /etc/security/access.conf is completely commented out.
  • SELinux - this is usually the culprit when a problem seems really weird.

Any ideas or experience with this problem and what the solution might be?

Thanks

linux

3 Answers

  1. A home directory must be set for the user. If the user doesn't have one, you can specify it directly in the cron.d-file.

    You probably need to provide PATH=/usr/bin/ too, or specify full path for the command.

    HOME=/tmp
0 3 * * *         apache    /usr/bin/php /path/to/my/script.php
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  2. Best Answer
    • Try using full path for php in cron config: /usr/bin/php
    • Check apache home directory: grep apache /etc/passwd As far as I know, user should always have home directory. It may reside not in /home.
    • Check syslog messages about security events. If this is PAM, you'll see something
    • Try disabling SELinux
    • 1

  3. cron by default runs with a very limited PATH; do you need to put in the full path to the php binary?

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