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POHow to debug an issue of cron's not executing a given script -- or other?
 

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  1. POHow to debug an issue of cron's not executing a given script -- or other?
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    <p>I have a Rails script that I would like to run daily. I know there are many approaches, and that a cron'd <code>script/runner</code> approach is frowned upon by some, but it seems to meet my needs.</p> <p>However, my script is not getting executed as scheduled.</p> <p>My application lives at <code>/data/myapp/current</code>, and the script is in <code>script/myscript.rb</code>. I can run it manually without problem as <code>root</code> with:</p> <pre><code>/data/myapp/current/script/runner -e production /data/myapp/current/script/myscript.rb </code></pre> <p>When I do that, the special log file (<code>log/myscript.log</code>) gets logged to as expected:</p> <pre><code>Tue Mar 03 13:16:00 -0500 2009 Starting to execute script... ... Tue Mar 03 13:19:08 -0500 2009 Finished executing script in 188.075028 seconds </code></pre> <p>I have it set to run with <code>cron</code> every morning at 4 am. <code>root</code>'s crontab:</p> <pre><code>$ crontab -l 0 4 * * * /data/myapp/current/script/runner -e production /data/myapp/current/script/myscript.rb </code></pre> <p>In fact, it looks like it's tried to run as recently as this morning!</p> <pre><code>$ tail -100 /var/log/cron ... Mar 2 04:00:01 hostname crond[8894]: (root) CMD (/data/myapp/current/script/runner -e production /data/myapp/current/script/myscript.rb) ... Mar 3 04:00:01 hostname crond[22398]: (root) CMD (/data/myapp/current/script/runner -e production /data/myapp/current/script/myscript.rb) ... </code></pre> <p>However, there is no entry in my log file, and the data that it should update has not been getting updated. The log file permissions (as a test) were even set to globally writable:</p> <pre><code>$ ls -lh total 19M ... -rw-rw-rw- 1 myuser apps 7.4K Mar 3 13:19 myscript.log ... </code></pre> <p>I am running on CentOS 5.</p> <p>So my questions are...</p> <ol> <li>Where else can I look for information to debug this?</li> <li>Could this be a SELinux issue? Is there a security context that I could set or change that might resolve this error?</li> </ol> <p>Thank you!</p> <p><strong>Update</strong></p> <p>Thank you to Paul and Luke both. It did turn out to be an environment issue, and capturing the <code>stderr</code> to a log file enabled me to find the error.</p> <pre><code>$ cat cron.log /usr/bin/env: ruby: No such file or directory $ head /data/myapp/current/script/runner #!/usr/bin/env ruby require File.dirname(__FILE__) + '/../config/boot' require 'commands/runner' </code></pre> <p>Adding the specific Ruby executable to the command did the trick:</p> <pre><code>$ crontab -l 0 4 * * * /usr/local/bin/ruby /data/myapp/current/script/runner -e production /data/myapp/current/script/myscript.rb &gt;&gt; /data/myapp/current/log/cron.log 2&gt;&amp;1 </code></pre>
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